What is everyone using for an in-tank fuel pump when swapping a LS into an 88-98 c1500?

 

Depends. What year is the swap truck and is it a pickup or SUV? Fuel tank design changed mid-1997 for pickups and possibly a year earlier for some of the SUV's, which has a big impact on which pump/sender design you can use.

Also, 1988-1995 are a low pressure pump for the TBI engine; 1996-1998 are high pressure for the Vortec.

I am pretty sure many people doing swaps with a 1996-up are re-using the existing pump as it's already rated at 60-66 PSI.

If you have a 1988-1995, it's got a 10-13 PSI pump, but you can get a pump for a 1996 pickup and it will fit your old style sending unit (even looks like the old pump) but will be the 60-66 PSI unit.

Richard

 

I've got a 94. I need a pump that will be sufficient enough to run a Turbo.

 

Walbro 400/450 with aftermarket regulator, return system.

 

Will the 400 drop in and bolt up without cutting?

 

Probably not....dont expect anything to just drop in and bolt up with an ls turbo setup in a non-ls year.

You need to be more specific about your goals for the truck and other parts like injectors, regulator, line sizes, power you want to push, and turbo you are using.

 

It's just a stock 5.3 and trans for now. I just don't want to change the pump twice. Looking for something that will support up to 7-800fwhp when it's all said and done.

 

You need to be more specific on what fuel you plan to use

 

Pump gas

 

A single 450 should be enough for 7-800 but it will be borderline, and assumes correct fuel line sizes, injectors, and system.

You should do a lot of searching and reading. The info is readily available.