Aftermarket Fuel Pumps

**1badtk** · 05-24-2007, 06:32 AM

Is this statement true when INstalling a aftermarket fuel pump?

The biggest problem with LS1 installations is the factory bucket that the pump resides in. It is equipped with a "Jet Pump" that keeps the bucket full and the pump submerged when the fuel level is low. Typically when this style of pump is installed, holes are drilled in the bucket to keep it full since there is no way to connect the jet pump. When this is done the jet pump is disabled, pump performace is greatly diminished, the tank will not empty properly and there is a good chace of sucking air into the system.

We now have and intank solution with the proper connection so that the jet pump can be connected and proper factory intended pump operation can be restored

I am only seeing 20psi with a new 255lph fuel pump.

**SteveC** · 05-24-2007, 07:10 AM

The person to ask about this is a board administrator "Ed Blown Vert ", he is active on the Western Forums, and has vast knowledge about these vehicles.

SteveC

**0rion** · 05-24-2007, 08:06 AM

It depends on the year of car you have. 98's don't have the bucket and jet pump but 99+ do. Racetronix makes a pump for the 99+ cars that doesn't require you to hack up your bucket.

**1badtk** · 05-24-2007, 08:36 AM

OK, well this one is a 98 LT1, so no bucket. Hum, well then the pump I have is bad, new one but only making 20psi before the regulator.

**mrr23** · 05-24-2007, 05:33 PM

well, they don't make a 98 LT1. so you either have a 97 LT1 or 98 LS1.

sounds like you got a pump for the old TBI which runs at 15-17 psi.

**1badtk** · 05-31-2007, 01:53 PM

Your right I have a 98 LS1 with only 20 psi at key on, or idle.

**mrr23** · 05-31-2007, 05:59 PM

i still say they sent you the wrong pump.

**Mr. Luos** · 05-31-2007, 06:48 PM

LS1 stock pump tends to send out 58-60 PSI.
My racetronix kit is as high as 67-68 PSI at idle when cool.

**1badtk** · 06-01-2007, 05:04 AM

Originally Posted by mrr23

i still say they sent you the wrong pump.

DING DING DING! We have a winner, the pump they sent me is for a LT1, and they are sending me a new one at no charge, and told me to dump the other one. They don't want it back.

**MechanicalMehem** · 06-01-2007, 07:17 PM

hmm how odd, they lied to you, the LT1s also ran higher pressures, just a sec I'll check alldata and tell you what they should have been for an LT1--41-47 lbs......LS1s 55-60 also note that theses are primarily intended to indicate a bottom low pressure, not necissarily a max pressure....

**rosspelletier** · 06-13-2007, 02:31 PM

Hey what did you do with that pump for an LT1? I believe the valve is bad in mine because it has no pressure in the system when the motor is off and when you turn the key on and the pump cycles there is pressure and then it drops down again when the pump goes off. Also did you have to pull your tank to get at it?