1996 Chevy Truck Low fuel pressure

GGALLOWS

MEMBER
1996 CHEVROLET TRUCK

Engine Performance problem
1996 Chevy Truck 6 cyl Two Wheel Drive Automatic

This is a chevy w/t with the 4.3 cpi engine. Cranks but won't run. Fuel pressure showed 15 psi. Replaced fuel pump and filter. New pump shows the same 15 psi. Returned pump and installed a second new pump thinking the first was a dud. Second new pump shows same 15 psi. Pump amp draw is around 4 amps. Is that low? I've checked and cleaned the pump ground. The pump harness looked ok. I'm stumped on what to check next. Surely I haven't got two bad pumps, Any help appreciated. Thanks

3 Replies

RASMATAZ

MECHANIC
75,992 POSTS

Hi ggallows, Welcome to 2carpros and TY for the donation.

You fuel pressure is suppose to be 60-66psi for a CPI spider unit-you're leaking pressure-remove the upper plenum and look at the pax side if there's a wash-up the injector is leaking if not the nut kit

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Tuesday, June 8th, 2010 AT 8:48 PM

GGALLOWS

MEMBER
2 POSTS

Thanks for the reply. Turns out the parts place gave me a pump for a TBI motor, so it was only putting out 15 psi. Got the correct pump and truck is fixed.

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Monday, June 14th, 2010 AT 10:16 AM

RASMATAZ

MECHANIC
75,992 POSTS

Next time you go buy parts get in here and we'll verify the parts for you.

TBI pump produces only 9-13 psi will never work on t
the CPI system its way too low of a pressure

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Monday, June 14th, 2010 AT 3:40 PM