Originally Posted by McMud (Post 6461349)

1797 Suburban.

Originally Posted by McMud (Post 6461349)

Hey Guys,

i also ordered a 06 LQ4 to swap it into my 1797 Suburban.
The Seller told me that i have the Rail System with the Return Line, so no Vette Filter.
Should i use filter before or after the 255 Walbro?
Does anybody of you know what size and type of connections a 79 Fuel Tank has?
Does this Fuel Tank have a Connection for a return line?

Greets From Austria :-)

Originally Posted by McMud (Post 6463081)

Hahahaha yes Napoleon was a Chevy Guy, thats why he called himself an Imperator :D
no just mistake, it's an 1979 ;-) According the seller is has the fuel rail with the return line, the engine will arrive end of January here.
The idea with the 87 tank is nice, but it's hard to get one here in Europe, so i want to use the Russell 650133 Filter before the Pump, so there can be
nothing damaged by junk, is that possible?

Originally Posted by LS-K (Post 6463122)

I read everyone talking about this "87 tank". What GM/Chevy model are you folks referring to? What's so special or unique about this tank, and why an '87 only?

Thanks in advance.

My build:
'82 K10 4x4.
Short bed with 350/700R4

Swapping in an '05 CTS-V LS6.

Originally Posted by LS-K (Post 6463148)

That's awesome

Thanks LS1Nova.

So I can pick one up from RockAuto specifically made for the R/V series '87 trucks and that's wah-la?

Originally Posted by Suburban_Tyler (Post 6328771)

I was doing some reading about fuel pumps and pressures and come across this on another forum. Thought I'd share if it's not already here somewhere.

Here is a little fuel pump tech…..

Just a little background. I’m installing a 2004 5.3 in a 9 GMC Sierra. When the fuel pump question came up I read that you needed to use a Delco EP241. To double check this I called S&P and they said also to use a EP241. Just for giggles ( after I installed the EP241 in the tank and truck ), I checked the specs on these pumps. Now what I got were specs from Airtex book where I work at Carquest.

EP241 ( E3210 Airtex) = Flow= 40 gph & PSI = 65-75
Now that pressure reading is right on the head of the pump at the lab and if you take into account filters and lines and lengths, it’ll probably equate to 50-55 psi… should be.

I wasn’t to impressed with those # and did some checking. I went up in years and found the EP381 pump used in the early vortec trucks, cyclones, ect….and here are it’s #’s

EP381 (E3270 Airtex) = Flow = 50-60 GPH & PSI = 80-90
Here again that psi rating is under perfect conditions at the lab and on the head of the pump. It should yield you a 70-80psi in the vehicle.

I called Airtex and talked to their guy Craig there. He confirmed these numbers I have here and inquired what I was working on. I told him and he said.. quote “ you should never use a EP241 on a vortec or LS1 motor” Craig went on to explain that it would work but the pump would be working itself to death to maintain the pressure and that would shorten the lifespan dramatically. He also explained that the EP381’s were manufactured with a new thin magnet design which yielded a lot higher torque that the EP241’s. They were specifically designed to work on Vortec & LS1 style engines. Also he said the current draw on the EP380 would be significantly less than the EP241, less current = less heat=longer life.
The EP241 is designed to work with TPI & MPI and should only be used in this application

I had my pump out fixing a split hose anyway so I went ahead and got the EP381, well our Airtex E3270.

Just wanted to pass along this little tid-bit of information. I know you guys with newer trucks already have high flow high pressure pumps in the tanks from the factory. But maybe this will help others with their modifications.

Originally Posted by bL.A.zer90045 (Post 6522141)

does the 381 fit directly into a 87-91 efi tank? would i use a 87 hanger assembly?im putting a 5.3 lm7 into my 86 k5.thanks!!!

Originally Posted by jamesjones (Post 6525611)

How about a Walbro 400? I don't need it now but plan on going FI in the future and would like the headroom.

Originally Posted by solidaxel (Post 6526176)

Is a Walbro pump better and cheaper than a stock 2002 Camaro in tank pump for a 5.7?

Originally Posted by truckdude239 (Post 6568525)

Dman i used compression fittings to an hoses

Originally Posted by laynrockers (Post 5550717)

Ok hoping to bring this thread back to life..

I have a shopping list of the following (see attached picture)

Now what fittings do i need to connect to the SS hose? and How do i make that connection??

Originally Posted by dman1982 (Post 6569251)

i seen a bunch, it just get confusing trying to go through the return less and return systems, kinda a dumb question but another thing that confuses me is i have three lines coming off my sender, then only two go into filter one leaves the filter to goto the fuel rail, what is done with the third line on the sender?

Originally Posted by mooseknuckles (Post 6569259)

biggest line is supply, then return and other is vent...some have 4, with the fourth one being for charcoal canister crap...just take your time, do some research it's all pretty simple, just overwhelming at first...

Originally Posted by 1980c-10 mybaby (Post 6838662)

if ive got a 99 lm7 5.3 motor which has a feed and return built into the motor do i have to run the return all the way from my fuel rail back to the tank(leaving 1 port open on the regulator) or can i run in back to the regulator(3 ports used) and just have the feed come from the tank????

read this whole thing and have not found and answer yet.