Gas Filler Leaks

[nate chase]

GMCer's,
Anyone got suggestions on what to use or where to get the rubber hose that
connects the gas filler tube to the tanks? After about 25 gallons (1/2 full)
I start to loose gas around my mid wheel on the drivers side. Sure cuts down
on the old gas mileage real quick!
Looks to be the hoses or connections. Hard to stick my face up there with
gas dribbling on it ;-] to see exactly where it's coming from. Can't imagine
I'd have to pull the tanks to change these babies out as long as there is
enough play or clearance to get the new hose on. Any experiences would be
appreciate as always...

Nate Chase
'75 Glenbrook
Omaha, NE

 

[bartz paul]

Nate:

Other than the standard size gas line hose, Cinnabar has the rubber fittings
needed to connect the tanks fill lines, etc., together. Look in your parts
book and you'll see the breakdown and parts involved.

If you are having trouble with gas leaking out the vapor separator that's
mounted in the front part of the drivers side rear wheel well, then you need
to remove it and clean it. There is a ball valve inside it that needs to be
free to move.

Paul Bartz

From: Nate Chase [mailto:chase]
Sent: Tuesday, May 04, 1999 12:17 PM
Subject: GMC: Gas Filler Leaks

Anyone got suggestions on what to use or where to get the rubber hose that
connects the gas filler tube to the tanks? After about 25 gallons (1/2 full)
I start to loose gas around my mid wheel on the drivers side. Sure cuts down
on the old gas mileage real quick! Looks to be the hoses or connections.
Hard to stick my face up there with gas dribbling on it ;-] to see exactly
where it's coming from. Can't imagine I'd have to pull the tanks to change
these babies out as long as there is enough play or clearance to get the new
hose on. Any experiences would be appreciate as always...

 

[scott shean]

> Anyone got suggestions on what to use or where to get the
> rubber hose that
> connects the gas filler tube to the tanks? After about 25 gallons
> (1/2 full)
> I start to loose gas around my mid wheel on the drivers side.
> Sure cuts down
> on the old gas mileage real quick!
> Looks to be the hoses or connections. Hard to stick my face up
> there with
> gas dribbling on it ;-] to see exactly where it's coming from.
> Can't imagine
> I'd have to pull the tanks to change these babies out as long as there is
> enough play or clearance to get the new hose on. Any experiences would be
> appreciate as always...
>
> Nate Chase
> '75 Glenbrook
> Omaha, NE

Nate, the area that you're describing holds the check valve that prevents
liquid gasoline from going through the fuel tank vent lines to the canister
located under the right side exhaust manifold. Either it is leaking, or
more likely, the hoses leading to it are leaking.

If all of your gasoline fill, vent, and canister hoses have not been changed
within the last 10 years, you should change them. The two 25 gallon tanks
must be lowered to perform the work. While the tanks are down, you should
also change the inlet "socks" that are inside the tanks. Don't forget the
line to the Onan and it's rubber hose between the fuel pump and the carb.
While this is quite a bit of work, for safety reasons alone, it needs to be
done. Also along the same line of thinking, the oil cooler hoses on the
right side of the engine, and the brake system hoses (front and back) should
be checked and replaced if they are older than 10 years. Some people will
argue that 10 years is too long. I changed my gas lines at 15 years, and at
the urging of this GMCnet, I realized that the brake and oil cooler hoses
also needed to be changed, and changed them after 20 years. I was lucky
that they did not give me any trouble.

Unless you are fortunate to have access to a pit, a 3 ton floor jack and
jack stands are the only special tools that you will need. Good luck.

Scott Shean
78 Royale
Baton Rouge, LA

 

[robert hopper]

I was able to purchase these filler hoses from cinnabar a couple of
years ago. I had tried (I think it was 2 1/8" hose) but couldn't get them
to seal. They actually had the 90 degree turn which made it easy to
install. In my case I had the tanks out for cleaning. Previous owner had
let it sit with original gas for 3 years.
- -----Original Message-----
From: Nate Chase
To: GMC (E-mail)
Date: Tuesday, May 04, 1999 12:19 PM
Subject: GMC: Gas Filler Leaks

>GMCer's,
> Anyone got suggestions on what to use or where to get the rubber hose
that
>connects the gas filler tube to the tanks? After about 25 gallons (1/2
full)
>I start to loose gas around my mid wheel on the drivers side. Sure cuts
down
>on the old gas mileage real quick!
> Looks to be the hoses or connections. Hard to stick my face up there with
>gas dribbling on it ;-] to see exactly where it's coming from. Can't
imagine
>I'd have to pull the tanks to change these babies out as long as there is
>enough play or clearance to get the new hose on. Any experiences would be
>appreciate as always...
>
>Nate Chase
>'75 Glenbrook
>Omaha, NE
>
>