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1sik7t2 · 02-17-2011, 06:47 PM

Hey thealien, thanks for helping out here....i'm havin a problem with my lq4 motor it has the single fuel rail system u speak of (2005) from a gmc savannah went to napa, thought the oem fuel filter would have a return, but it's just 1 in 1out so now i'm so confused...it wont start unless you are spraying starter fluid in the intake -----& i dont have the mass air hooked up any help would be very appreciated thx dave

=Thealien;3686299]Fuel system (any chance a mod can move this post up?)
The LS engines require 58-60 pounds pressure at the fuel rails. Older fuel rails had a regulator on the rails and there is a feed and return on these engines. On the later fuel rails there is only the feed on the rail. You need to have something like the filter regulator shown below to return the excess fuel to the tank. Some of the tanks these engines came with did this internally in the tank.

Corvette filter/regulator

I don't know how long this will last but a decent deal on the regulator/filter and he will take offers for less I am told

GF822
Lots of people use Walbro external pumps

Walbro external pumps and fittings
Dorman quick disconnects for GM fuel line

Dorman 5/16ths

Dorman 3/8ths
Russel AN quick disconnects

Russel 3/8ths

Russel 5/16ths
Don't have a way to make the GM quick disconnect? Try one of these

Dorman flare to quick disconnect
Fuel pump tank adapter

F-body LS1 fuel pump adapter kit
here is an installation tutorial of the adapter kit

Tutorial of adapter kit
Another gas tank modification

EFI pump tank mod
Dual tank info

Compliments of Glock35ipsc[/QUOTE]

02-17-2011, 06:47 PM	#114
1sik7t2 dave Join Date: Jul 2007 Location: el cajon Posts: 558	Re: LS engine swap info Hey thealien, thanks for helping out here....i'm havin a problem with my lq4 motor it has the single fuel rail system u speak of (2005) from a gmc savannah went to napa, thought the oem fuel filter would have a return, but it's just 1 in 1out so now i'm so confused...it wont start unless you are spraying starter fluid in the intake -----& i dont have the mass air hooked up any help would be very appreciated thx dave =Thealien;3686299]Fuel system (any chance a mod can move this post up?) The LS engines require 58-60 pounds pressure at the fuel rails. Older fuel rails had a regulator on the rails and there is a feed and return on these engines. On the later fuel rails there is only the feed on the rail. You need to have something like the filter regulator shown below to return the excess fuel to the tank. Some of the tanks these engines came with did this internally in the tank. Corvette filter/regulator I don't know how long this will last but a decent deal on the regulator/filter and he will take offers for less I am told GF822 Lots of people use Walbro external pumps Walbro external pumps and fittings Dorman quick disconnects for GM fuel line Dorman 5/16ths Dorman 3/8ths Russel AN quick disconnects Russel 3/8ths Russel 5/16ths Don't have a way to make the GM quick disconnect? Try one of these Dorman flare to quick disconnect Fuel pump tank adapter F-body LS1 fuel pump adapter kit here is an installation tutorial of the adapter kit Tutorial of adapter kit Another gas tank modification EFI pump tank mod Dual tank info Compliments of Glock35ipsc[/QUOTE] __________________ check out my build "DIRTY BURB"