Question about 1991 Chevrolet C1500

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1991 Chevy C1500 5.7 hard start when cold. 20-30 cranks. Warm starts easily. New Fuel Filter, Good fuel pump pressure, Rebuilt fuel pressure regulator.

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Posted on Jan 02, 2017

  • 66 Answers

SOURCE: hard start

Its your fuel pump.I had the same plomblem not too long ago.I was spraying either in to start it.I have a 97 chevy truck witch requires 65 psi to start and 55 to run properly.You need to find out much psi you need to start it.You can probaly look in your manual or just make a few calls.My truck had 55 psi and it ran fine i just had to get it running first.Good luck.I wonder if that fuel pressure regulator was a waste of time like it was for me.

Posted on Nov 25, 2008

  • 140 Answers

SOURCE: 1998 Chevy tahoe Hard to start when cold

Hello, yes the check valve is in the fuel pump assembly. The check valve is leaking and the pump will burn out soon. Unfortunately the aftermarket fuel pumps can be very unreliable. A good portion of problems we see on this site are from people who replace the pump sometimes twice and it still doesn't work.

Posted on Jan 03, 2009

  • 74 Answers

SOURCE: 1998 Chevy tahoe Hard to start when cold

replace your MAP sensor(manifold absolute pressure) the map sensor is the computer for your fuel pressure regulator telling how much pressure. Unless your tahoe runs like **** going up hill than it inevitably your fuel pump

Posted on Feb 17, 2009

  • 29 Answers

SOURCE: 1991 Chevrolet Silverado C1500 hard to start when

I have seen this problem before ck the coil and coil wire and also condition of distributer cap and rotor,ck the coil and coil wire for white corrosion or black burned ends,hope this helps

Posted on Sep 30, 2010

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Just because you replaced the fuel pressure regulator does not mean it is working correctly; which is the most common cause of your problem. Hook up a fuel pressure guage and watch what happens when you are starting it cold - it should go up to about 47 PSI and once started it should read between 40-47 PSI, then when you turn the engine off: Does the pressure drop? There is a check valve built into the fuel pump also; that can be faulty and if the pressure is generally reading low and the check valve is bad- this can also create your problem. We have run into this before also; When the fuel pump is cold the internal pump seals are sealing great, but after a period of running time the pump seals lose sealing power and if you try to start it again it will be hard to start. The biggest thing with this situation is getting the fuel pressure readings at the following points of time:: Start-up, running cold, running at normal operating temp, engine off, engine re-start.
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1991 Chevrolet Silverado C1500 hard to start when cold. Rebuilt TBI, replaced fuel filter, good fuel pressure pressure. After several crankings 20-25 times it will finally start, and run and drives ok....


I have seen this problem before ck the coil and coil wire and also condition of distributer cap and rotor,ck the coil and coil wire for white corrosion or black burned ends,hope this helps

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1998 Chevy tahoe Hard to start when cold


replace your MAP sensor(manifold absolute pressure) the map sensor is the computer for your fuel pressure regulator telling how much pressure. Unless your tahoe runs like **** going up hill than it inevitably your fuel pump

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1998 Chevy tahoe Hard to start when cold


Hello, yes the check valve is in the fuel pump assembly. The check valve is leaking and the pump will burn out soon. Unfortunately the aftermarket fuel pumps can be very unreliable. A good portion of problems we see on this site are from people who replace the pump sometimes twice and it still doesn't work.

Jan 03, 2009 | 1998 Chevrolet Tahoe

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