Gas Tanks

richard waters

New member
Feb 8, 1999
1,236
0
0
Gee and I thought I had problems today! At least I can drive my coach
and use the gas tanks.

I don't know the cause of your problem. I just know that when I fill up
my coach I have to go very slow after about 15 gals (if it was close to
empty) at about the 1st notch. If I don't do that, I'll get fuel coming
out of the filler. It comes out in quite a gush! I supsect that if I
left
it running at the 2nd notch like you did I'd get a large puddle under
the coach.
The first time it happened to me, I was really suprised at how much gas
shot
out.

The problem is apparently caused (as you probably already know) by the
return
line (for the air being displaced)is too small and probably has kinks in
it.
My tanks gurgle for quite some time after a fill up. Maybe for as long
as you
report, but I don't keep track because I'm usually driving from the gas
station.

This has to be discouraging. You've been working on the lady for over 2
years,
getting close to being able to finally drive it and you have a problem
that has
you spooked.

I don't know if this helps, but at least you have company today with
someone
who has had problems with his GMC as well.
Richard Waters
- -----

>
> GMCers
>
> Here is my tale of woe. I had gas tanks redone. Put in new senders and
> gaskets. Closed off all tank leads and blew into them. No apparent leaks.
> Once they were installed I blew through each line in and out of tank. All
> seemed clear---no major restrictions. Hooked up all lines and made a run
> into town----running on outboard tank. Got to the Shell station and started
> filling up. I set the nozzle on the second of 3 notches and let it run. I
> stopped
> it at 25 gallons because I wanted to see what the gauges were reading. When
> I looked at the readings I had an empty main tank and a full reserve tank.
> Sat there for a while and looked at them---nothing changed. Decided to
> add some more gas. Reset the nozzle at second notch. All of a sudden
> at 27 gallons I had gas flowing everywhere out of the tanks. We are not
> talking about something coming out of a fuel line. We are talking
> about a major overflow. I could not get down and get a good look at what was
> going on because the owner was there yelling at me to get this "antique piece
> of junk out of here." My first thought was that one of the connections
> between the tank and the fill line had come off. Checked them today.
> Thats not the problem. It took me about 15 min to get home. I went in and
> fixed a drink. Came back out and for the next 20 min the tanks sat there
> and made gurgling sounds. Once they stopped I decided to check the
> gauges again. Now I was showing 1/2 full on both gauges. Is it possible
> I could have built up enough pressure to blow a seal out from under
> one of the senders? On the way home I watched the rear view mirrors
> and did not see any spilled fuel all the way home. I sure would like
> to hear about what to check. The senders are the ones from Golby.
> I did not add any kind of sealer as they seemed to seal down
> fairly well. I will admit that for the first time in this project I am
> really spooked. Thanks for any help you may have.
>
> Take Care
> Arch
 
Arch,

We did the same thing the first time out after our frame off, although our
gas station attendant was a little nicer about it than yours :). On ours
it was one of the sender o-rings. We reused the originals which did not
have the "keep in place" tabs and one had moved slightly during sender
installation. This allowed for the gas to leak out the top of the tank at
a very rapid rate similar to your description. We did make a trip before
we were able to change the o-ring. We just made sure not to put too much
gas in.

If I recall correctly you changed the o-rings to the new style ones, so I
don't know if this will be your problem or not. It is likely that if the
one on the reserve tank was leaking, gas would go more quickly into that
tank because it would "breath" better. I not sure why it would take so
long for the other tank to get any gas, however. Are the vent lines ok?
Is the vapor separator stuck closed?

One thing I would definitely suggest is to VERY SLIGHTLY pressure test the
tanks before install. It takes only a minute, but would have definitely
prevented our problem, and might have prevented yours. When we reinstalled
the tanks with the new o-rings, we held our fingers over the vent, fuel
injection return line, and generator feed lines (probably need a helper's
fingers or it will be a little awkward covering all these holes :). We
then used the blow gun at very low pressure to pressurize the tank to see
if there were any leaks. It was a simple quick method that we sure wished
we had tried the first time!

Hope this helps,
Zak

>GMCers
>
>Here is my tale of woe. I had gas tanks redone. Put in new senders and
>gaskets. Closed off all tank leads and blew into them. No apparent leaks.
>Once they were installed I blew through each line in and out of tank. All
>seemed clear---no major restrictions. Hooked up all lines and made a run
>into town----running on outboard tank. Got to the Shell station and started
>filling up. I set the nozzle on the second of 3 notches and let it run. I
>stopped
>it at 25 gallons because I wanted to see what the gauges were reading. When
>I looked at the readings I had an empty main tank and a full reserve tank.
>Sat there for a while and looked at them---nothing changed. Decided to
>add some more gas. Reset the nozzle at second notch. All of a sudden
>at 27 gallons I had gas flowing everywhere out of the tanks. We are not
>talking about something coming out of a fuel line. We are talking
>about a major overflow. I could not get down and get a good look at what was
>going on because the owner was there yelling at me to get this "antique piece
>of junk out of here." My first thought was that one of the connections
>between the tank and the fill line had come off. Checked them today.
>Thats not the problem. It took me about 15 min to get home. I went in and
>fixed a drink. Came back out and for the next 20 min the tanks sat there
>and made gurgling sounds. Once they stopped I decided to check the
>gauges again. Now I was showing 1/2 full on both gauges. Is it possible
>I could have built up enough pressure to blow a seal out from under
>one of the senders? On the way home I watched the rear view mirrors
>and did not see any spilled fuel all the way home. I sure would like
>to hear about what to check. The senders are the ones from Golby.
>I did not add any kind of sealer as they seemed to seal down
>fairly well. I will admit that for the first time in this project I am
>really spooked. Thanks for any help you may have.
>
>Take Care
>Arch
>
 
Sorry to hear about your Tk. problems!!! Bummer!! after having all that work
done. Just wanted to say that on last trip when filling I had nozzle wide
open and it shut off when it was almost full, heard gurgling sound of fill
tube draining to tank waited afew min. at the most and topped off with
another 2-4 gal.. Your vent from M.T. Tk. could be plugged crimped? I know
you said you blew thru them but maybe something got stuck in it? But other
than that not much help from me. Hope you find a easy repair!!!!

Ron&Gina
73 Pumpkin-Rose
Ft. Mohave, AZ.

- ----- Original Message -----
From:
To:
Sent: Sunday, July 25, 1999 10:00 PM
Subject: GMC: Gas Tanks

> GMCers
>
> Here is my tale of woe. I had gas tanks redone. Put in new senders and
> gaskets. Closed off all tank leads and blew into them. No apparent leaks.
> Once they were installed I blew through each line in and out of tank. All
> seemed clear---no major restrictions. Hooked up all lines and made a run
> into town----running on outboard tank. Got to the Shell station and
started
> filling up. I set the nozzle on the second of 3 notches and let it run. I
> stopped
> it at 25 gallons because I wanted to see what the gauges were reading.
When
> I looked at the readings I had an empty main tank and a full reserve tank.
> Sat there for a while and looked at them---nothing changed. Decided to
> add some more gas. Reset the nozzle at second notch. All of a sudden
> at 27 gallons I had gas flowing everywhere out of the tanks. We are not
> talking about something coming out of a fuel line. We are talking
> about a major overflow. I could not get down and get a good look at what
was
> going on because the owner was there yelling at me to get this "antique
piece
> of junk out of here." My first thought was that one of the connections
> between the tank and the fill line had come off. Checked them today.
> Thats not the problem. It took me about 15 min to get home. I went in and
> fixed a drink. Came back out and for the next 20 min the tanks sat there
> and made gurgling sounds. Once they stopped I decided to check the
> gauges again. Now I was showing 1/2 full on both gauges. Is it possible
> I could have built up enough pressure to blow a seal out from under
> one of the senders? On the way home I watched the rear view mirrors
> and did not see any spilled fuel all the way home. I sure would like
> to hear about what to check. The senders are the ones from Golby.
> I did not add any kind of sealer as they seemed to seal down
> fairly well. I will admit that for the first time in this project I am
> really spooked. Thanks for any help you may have.
>
> Take Care
> Arch
 
>
> One thing I would definitely suggest is to VERY SLIGHTLY pressure test the
> tanks before install. It takes only a minute, but would have definitely
> prevented our problem, and might have prevented yours. When we reinstalled
> the tanks with the new o-rings, we held our fingers over the vent, fuel
> injection return line, and generator feed lines (probably need a helper's
> fingers or it will be a little awkward covering all these holes :). We
> then used the blow gun at very low pressure to pressurize the tank to see
> if there were any leaks. It was a simple quick method that we sure wished
> we had tried the first time!

Could try this A&P trick - put a balloon on the vent and inflate via the
outlet fitting. You can put a vacuum line cap on the inlet and see if
the balloon stays inflated. This is a very sensitive check and prevents
overpressurizing the tank.

Patrick
 
Sorry to hear tale of woe.
Sounds like 2 problems together.
1. The Seal was not seated on rear tank.
2. Vent for front tank is either completely or mostly blocked.

Soo when you fueled quickly the rear tank was well vented because of bad
seal. Front tank became pressurized to slight extent so everything went to
the back and out the top, After enough time and sloshing the gas from the
full rear tank worked its way into the front bleeding out the air.

If thats not what happened I'll lend you my crying towel. Every GMC needs one.

Bill Hubert

>In a message dated 7/26/99 12:57:52 AM Central Daylight Time,

>
> > I did not add any kind of sealer as they seemed to seal down
> > fairly well. I will admit that for the first time in this project I am
> > really spooked. Thanks for any help you may have.
> > >>
>
>Arch,
>Some time back someone said he had become an expert at dropping and
>reinstalling tanks - had a hard time getting the rubber "O" rings to seat
>properly. Sounds like maybe your rear one didn't seat. I didn't have a
>problem with mine, but I had heard so many stories that it made me extra
>careful - didn't want to do that but once.
>That still wouldn't explain why the rear tank filled up first with none
going
>to the front tank. Were you on an incline? Another possibility - you may
have
>pulled the vent line loose. Looks like you're gonna have to drop 'em again.
>Lanier
>
>
>
 
Hey Arch,
Could be something a little simpler too...
My gmc leaked gas all over a station in
Georgia. I thought I had lost a main hose
to the tank. I was filling the tanks when
I reached the point where it shut off the
pump. I could hear gas bubbling down the
fill tube so waited a few minutes and restarted
gasing her up. All of a sudden I hear gas
spilling on the ground,Looked like it was
coming from the tanks...I mean LOTS of gas. I
lost a few gallons. I started her up and moved
her away from the station. Started looking
around and couldnt find any gas leaking under
her. Turned out to be leaking around a " gas
seprator? " in the wheelewell. I cut the hose
and installed a spare gas filter inline. No
more gas spills. This was the second spill on
that trip. The first time we noticed gas on the
ground but finding no leak wrote it off as
someone elses problem.
Hope this helps,
Rob Teed 74 Painted Desert

> -----Original Message-----
> From: owner-gmcmotorhome
> [mailto:owner-gmcmotorhome]On Behalf Of
> EMERYSTORA
> Sent: Monday, July 26, 1999 12:08 PM
> To: gmcmotorhome
> Subject: Re: GMC: Gas Tanks
>
>
> In a message dated 7/26/99 1:01:16 AM Eastern Daylight Time, Gcbr

>
> add some more gas. Reset the nozzle at second notch. All of a sudden
> at 27 gallons I had gas flowing everywhere out of the tanks. We are not
> talking about something coming out of a fuel line. We are talking
> about a major overflow. I could not get down and get a good look
> at what was
> going on because the owner was there yelling at me to get this "antique
> pieceA
> of junk out of here. >>
>
> Arch - sorry to hear of your problem. Sounds to me as if one of the vent
> hoses at the top of a tank was not in the hollow trench along the
> top of the
> tank and was pinched shut between the tank and the floor. When
> the pressure
> got high enough it probably blew the hose off the vent nipple on
> the tank. I
> glues several pieces of rubber tire tread about 1/2 inch thick to
> the top of
> my tanks so that the hoses wouldn't get pinched since it is
> almost impossible
> to keep the hoses in the right place when the tank is pushed into
> position.
>
> Emery Stora
> 77 Kingsley
> Santa Fe, NM
>

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Arch -
The solution to your problem is obvious-just forget about those large
50 gallon tanks and go with the small portable ones you gerry rigged
up,-they work where as the other doesn't.

Seriously it is pretty disappointing when you work real hard to fix
something and it doesn't work. Your unfortunate experience with gas
pouring out all over, did however bring a smile to my face as I recalled
my own experience many moons ago. I flew down to Arizona to get my
GMC,and at that time I knew beans about them, only that I liked them and
wanted one. After purchase and in preparation for the long drive back
home to BC I went to the local gas station,after filling the tanks for
awhile I noticed gas pouring out from somewhere at the back.I didn't
know exactly from where but I paid the attendant and got out of there
real fast, before they noticed the spill. In hindsite not very
responsible, but that's what I did in any case. Later I found that the
black box at the left rear wheel was leaking and a vent on the top of
the tank was cracked. One thing though, you sure do learn from your
problems and mistakes.

Hope you get it fixed, relax and take your time.
Claude in Victoria
 
Arch,
I have an extra here that I don't use anymore. Do you use Johnson or
Mercury connections? Mine's a Merc. I can arrange for a drop shipment to
occur somewhere along your trip.{:>)

Roger
PS, it does have some mixed gas and oil, good top end lube for free.
 
Roger,
You're pretty mean!

Actually I have an extra tank now that I think about it.
It's for a Johnson that I sold and still has about 1-2 gallons
of fuel left in the tank. That would be a bonus (except for the oil).

Maybe we could all get together and donate our used boat gas
tanks to Arch. I can see it now, Arch driving down the highway
with 10 boat gas tanks strapped to the roof of his coach. There
would be a fuel management issue however. I don't know how he would
manage to switch tanks every 50 miles or so. But, I'm confident
that the GMC net would come up with a solution for him.

Richard
- -------

>
> Arch,
> I have an extra here that I don't use anymore. Do you use Johnson or
> Mercury connections? Mine's a Merc. I can arrange for a drop shipment to
> occur somewhere along your trip.{:>)
>
> Roger
> PS, it does have some mixed gas and oil, good top end lube for free.
 
Arch,
Just another bump in the road. If we stopped for all of them, we'd never
get anywhere. Keep that imagination of yours on full speed ahead. Have a
good trip and have fun doing it. Keep that hat cocked, Commodore.

Roger
 
We could just place them along the road for him and he could snag them like
the old railroad mail bags. Let him figure out how to hook them up. He's
retired, he's got the time. Probably take him 20, maybe 30 minutes.{:>)

Roger
 
Arch,
We're just amazed at the things you come up with. Like, all the time. Kind
of what the hell is he going to do next? Who'd ever thought a boat tank to
get you where you needed go at the time. Wild idea, but betcha it's in the
back of a lotta minds as a quick emergency possibility now.

Roger
 
>Arch,
>We're just amazed at the things you come up with. Like, all the time. Kind
>of what the hell is he going to do next? Who'd ever thought a boat tank to
>get you where you needed go at the time. Wild idea, but betcha it's in the
>back of a lotta minds as a quick emergency possibility now.
>

I talked to a local used motorhome sales guy (he owns the place) about this
idea. He regularly uses 2-5 galon gas cans inside the MH when he buyus
something that's been sitting for a long while. He says that it saves a lot
of heartache and more damage.

Arch - he likes the outboard gas can idea better.

Henry

Henry Davis Consulting, Inc / new product consulting
PO Box 1270 / product readiness reviews
Soquel, Ca 95073 / IP reviews
ph: (831) 462-5199 / full service marketing
fax: (831) 462-5198
http://www.henry-davis.com/ http://www.henry-davis.com
 
Arch

Install a "T" just in front of the elect fuel pump and fill the can from there.

I have already added a "Extend-a-stay" to my LP line so I can use 20 lb bottles if
needed. At the county dump, I have rescued 6 20 lb bottles (some full). People
just throw away stuff and go out and buy new.

Wayne Newland

> Roger
>
> Well, here is my next thought. I am going to keep the tank. Last night I
> had another idea. If I put in a "T" in my generator line and a shut off valve
> I could run the generator off the tank even if my main tank was below
> 1/2 full. Might be a Y2K problem solver------and I dont even believe in
> that! It might also be a way to keep a genset running if you were
> boondocking for a long period of time---take the toad to town and
> get gas. Heck its just an Idea.
>
> Take care My Friend
> Arch
>
> In a message dated 7/28/99 12:01:16 AM Central Daylight Time,

>
> > Arch,
> > We're just amazed at the things you come up with. Like, all the time.
> Kind
> > of what the hell is he going to do next? Who'd ever thought a boat tank
> to
> > get you where you needed go at the time. Wild idea, but betcha it's in the
> > back of a lotta minds as a quick emergency possibility now.
> >
 
We just know you like redundant systems, and 10 of 'em seems like enough


Plus, you get those primer bulbs as a backup to your elect. pump!

Mark

|GMC Folks
|
|I will be able to do without your OLD outboard tanks. I can beat
|this thing.
|I am just sorry you have no more faith in me than to think I will need
|them. :>)---- Maybe we could all get together and donate our used boat gas
|> tanks to Arch. I can see it now, Arch driving down the highway
|> with 10 boat gas tanks strapped to the roof of his coach. There
|> would be a fuel management issue however. I don't know how he would
|> manage to switch tanks every 50 miles or so. But, I'm confident
|> that the GMC net would come up with a solution for him.
|>