Question about 2001 GMC W3500

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Isuzu npr 5.7 gas not starting on its own

Help! fuel pump intermittant turn the key sometimes i hear the click other times no click. runs great when i prime carb runs for a few months then wont start
5.7 isuzu npr 1998 gas

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  • Anonymous Mar 21, 2014

    Park brake drum won't true up on Isuzu NPR 200

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Ok I had same problem with my 1996 Isuzu npr 5.7 gas burner. on top of fuel tank are wires and cant remember if it was 3 or 4 but anyways one of those wires is your ground wire to the fuel pump its self. make sure the wire has a good ground on the frame and/or the bed body of the truck. wish you the best hope I could help you

Posted on Sep 27, 2013

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Sounds like its time to replace the fuel pump.

Posted on Feb 05, 2010

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Posted on Jan 02, 2017

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1 Answer

So my fuel pump has been making a high pitched noise for a while. Then one day, without warning, I tried to start the car but it wouldn't. It cranked but would not start. I turned the car on (not start)...


I looked at info for 3.1L vinM Buick regal. fuel pressure key on engine off, 40.5--47 psi. Can you check the vin? The fuel pressure specs I have for 3.8L engine are even higher than the 3.1L.
You will get a fuel pump prime, key on engine off. You need to make sure fuel pump runs with engine cranking.
My hearing is no good, I can't hear fuel pump with engine cranking.
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Apr 15, 2017 | Buick Regal Cars & Trucks

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Fuel pump


Testing of the fuel and ignition systems is in order. Intermittent problems need testing when the problem is present, otherwise it won't help find the problem.
I would start by checking for spark on a spark plug wire (or two or three plug wires, in case it may be a bad coil), during those times when it won't start. You need to see a blue, snapping spark to verify ignition system is working.
To check the fuel system, have the fuel pressure checked, and the injector circuit checked. Good that you hear the pump, but you don't know if fuel pressure is correct, or if fuel is getting into the cylinders. One short test is to spray starting fluid or carb cleaner into the intake while engine is cranking. If engine fires up for a few seconds, you know it is a gas related problem.
If ignition system is the intermittent problem, could be failing coil or coils, ignition module, crank position sensor, even the computer, or a wiring problem like a bad connection. Testing of each component will be required, or you could start throwing new parts at it, like many people do, until you find the bad part. Find a reputable mechanic-there still are a few, lol.

Jul 30, 2013 | 1998 GMC Sierra

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Fuel pump/filter? ran out of gas, can't seem to prime after 2 gal in tank, runs when placing a bit in through throttle body then dies.


might of clogged filter also 2 gal might not be enough check for fuel pump noise also when you run these cars out of fuel the pump over heats and goes bad

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SENDING UNIT ???????


most of fuel pumps were in tank, wire corrodes is harness under right front seat floor pan to tank
if fuel pump buzz is heard and car runs and when it doesnt run you cant hear the fuel pump try
turn ignition off wait 10 seconds
turn ignition to on position to (prime or hear pump buzz)
no buzz fuel pump not working check fuel pump relay(swap with another) and try again?
you could use test light to pump wiring and make sure your getting power to pump on this prime test no power relay or wiring problem.
power at pump, but no buzz fuel pump faulty

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fuel pump may be going. try this. turn key on, listen for fuel pump to run for 5 seconds. Turn key off, wait 15 seconds or until you hear relay click inside car. Turn key on again for 5 seconds and ff for 15 seconds. repeat once more. This will pressurize fuel system to 40 psi so injectors have full pressure. If it starts quickly now, you are getting bleed down through the check valve in the fuel pump or the fuel pressure regulator on the fuel rail.

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I i were you i would check the ignition. it sounds like you are only connecting some of the time. And yes it is very normal to hear the fuel pump kick on when you turn the key to the on position.

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