Pressure I should be considered, but also the volume.
Keep in mind the Cubic inch does demand mor than a smaller even if the RPM
is lower.
Randy, what's your thoughts on adjusting the pressure regulator at the
throttle body?
On Tue, Jun 11, 2019 at 7:25 AM Randy Van Winkle via Gmclist <
> > Looks like it is vapor lock season again. Back in 2013 I did a bunch
> > of upgrades to my fuel system to solve a number of fuel supply
> > problems. I started posting the pics to the gmcmh photos site but got
> > side-tracked and forgot to finish the uploads. I was recently asked
> > about my in-tank fuel pump upgrade which reminded me that I should
> > really finish my post to the photos site. Especially now that a few
> > years have passed and the upgrades seem to have solved the various
> > problems that I was having. If you are having any of these problems,
> > hopefully this collection will help.
>
> Just a word of warning on the E3902. This pump was recommended by Bill
> Bramlet and Emery Stora when they developed and documented the in-tank pump
> setup found in the GMCMI Technical Documents web site. I installed these
> in-tank pumps many years ago and did not have any problems for many years
> until I got a load of dirty gas (the gas station pump filter failed, I
> think). I had to drop the tanks to replace the socks that were almost block
> by
> crud. After cleaning everything up, I decided to replace the pumps while I
> was there. I started to have loss of power issues that I could not explain
> except that fuel pressure was below the 16 to 18 psi that Howell's
> injectors require. I thought that the socks had become blocked again. I
> dropped the
> tanks - socks were in great shape. So, I ordered new pumps but this time I
> checked the specs. The minimum pressure is rated at 12 psi while the max is
> around 18 psi. I found this strange and found an old listing that showed
> the specs with higher numbers. I think Airtex must have changed the specs on
> this pump. This pump is used on an S10 Chevy Pickup. They list another
> pump used on the port injected models that has the same fitment so I ordered
> two of these pumps and have not had anymore problems with fuel pressure.
> Anyway, you might want to monitor your fuel pressure in order to make sure
> you are getting enough pressure for the Holley injectors. This pump should
> be OK for the Rochester TB and maybe for early Howell systems that used the
> large injectors because their requirement is between 10 and 13 psi.
>
> --
> Randy & Margie
> '77 Eleganza II '403'
> Battlefield, MO
>
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--
Jim Kanomata
Applied/GMC, Newark,CA
jimk
http://www.appliedgmc.com
1-800-752-7502
