Fuel Pressure is at 40psi with ignition switch on and it drops to Zero PSI fast. When engine is running PSI stays at 35 and when I idle it jumps to 41psi.
Symptom that car has is that it stalls for a couple of seconds when I hit the throttle then it picks up. Could it be a bad fuel pump or should I rule out any other parts?
Thanks.

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02-27-2018, 09:31 PM

Pro

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Join Date: Oct 2003

Location: DFW

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Car: 1992 Z28 and 1995 Silverado

Engine: 5.7 TPI and 5.7 TBI to TPI convert

Transmission: 700R4 and 4l60E

Axle/Gears: G80 3.23 and open 3.42

Re: Fuel Pump Replacement?

When you say it stalls for a couple of seconds when you hit the throttle, does it do it when cold or when warmed up (or both)?

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02-28-2018, 07:37 AM

JuanZ28

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Join Date: Aug 2017

Location: Lake Elsinore CA.

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Car: 1987 Camaro Iroc Z28

Engine: 5.7 TPI

Transmission: 700R4

Re: Fuel Pump Replacement?

Both when cold and hot.

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02-28-2018, 06:21 PM

Pro

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Join Date: Oct 2003

Location: DFW

Posts: 1,054

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Received 3 Likes on 3 Posts

Car: 1992 Z28 and 1995 Silverado

Engine: 5.7 TPI and 5.7 TBI to TPI convert

Transmission: 700R4 and 4l60E

Axle/Gears: G80 3.23 and open 3.42

Re: Fuel Pump Replacement?

Well dropping PSI immediately after the pump turns off is concerning. Its probably running rich but having scan data would be nice. You should try and find out where the fuel is going when pump is off. Here's a pretty good demo of how to do it, but you can come up with your own way.