Question about 2002 Chevrolet Silverado 1500

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What is the fuel pressure specs on a 2002 Chevy 1500 with a 4.3l engine.

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Key on engine not running 55 to 65psi,should decrease 3 to 10psi with engine running at idle.

Posted on Oct 04, 2009

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45 psi at idel fuel regulator connected 55 PSI with regulatr having an applied vachum to it. thr ost impotrsnt thimg is whern it'd running does it hold 39 PSI with key on engine off and for at least 30 seconds. once you prine the pu,pump it will not old that pressuer then you have a bad check vavce in the pump. so the pump has to be replaced, On the high end it has to read 50 psi full throttle. if it does nor rhen you have a vachum leak or your manifold pressure is not holding the correct vachum. WHich could be caused by throttle plate opening all the way or the way or there is a eaning of a vachum leak from theinyake hose or heare. ope this seld.

Posted on Oct 04, 2009

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Posted on Jan 02, 2017

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SOURCE: fuel pump pressure specs

The fuel pump specs are 14 psi. and 20 gallons an hour.

Posted on Sep 08, 2009

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SOURCE: Truck bogs down when I accelerate.

I've got 260K on a 2003 4.8 Silverado. Fuel pump has caused this same problem, 1 after market fuel pump lasted 20,000, the same replacement was 30,000 miles. I made my mechanic put the correct fuel pump from GM using the VIN . The other time I was losing power at about 180K miles it was the cat converter. Hope this helps

Posted on Sep 16, 2009

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1 Answer

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Base fuel pressure at idle for a MPFI engine is around 40-45 psi. It if were a vortec engine like the 4.3 V6 the pressure would be around 70psi.

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I have a 2002 Chevy Blazer with a 4.3. It has two engine codes, p0170 and p0172, which I believe are fuel rich bank one and two. It starts great, but after warming up, is very hard to start and requires...


Can you post the fuel pressure spec for us? You have the spider fuel system? When you use a gage and check proper fuel pressure, with the key off will the pressure hold for a bit? If it drops like a rock, you have a fuel pressure leak.
Smell of the crankcase oil dipstick, does it smell like gas? If so, either you don't change your oil and filter very often or you have a fuel leak getting into your crankcase. If the problem is the latter, you fix the problem then change oil and filter as many times as necessary to get rid of the gas.
Check the fuel pressure regulator and vac line.

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The code indicates that you have a rich mixture on bank 1 and on bank 2. This is usually indicating the O2 sensor but it is not 100% It could be the fuel pressure regulator allowing too much fuel or it could be coolant sesor saying the engine is cold therefore requiring more fuel.Without having the vehicle hands on it is hard to tell but I hope I gave you a starting point.

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Fuel pump pressure specs


The fuel pump specs are 14 psi. and 20 gallons an hour.

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I would verify fuel pressure is in spec.On the back of the motor on the drivers side you will find a shrader valve(kinda like a valve stem on a tire)Its just alittle larger.You can buy a fuel pressure gauge at your local parts house and they can give you the spec as well.If its not in spec the pump is in the gas tank.

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