Question about 1999 Chevrolet K1500

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How do you know when your fuel pump realy is going out

When i try to start my tuck it doesn't start when i turn it all the way. If i turn it to ACC for a little bit then turn it all the way it starts. Is it my pump or relay

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  • 361 Answers

Probably a weak pump,take and have a fuel pressure test done

Posted on Jul 26, 2014

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Posted on Jan 02, 2017

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SOURCE: 02 camaro wont start fuel pump relay or fuel pump

Take the fuel line off before the filter and turn the key on and see if you get any fuel out of the line. If you don't get any fuel unplug the wire connector to the fuel pump turn the key on and see if you get a hot wire going to the pump. if you get a hot wire then it is your pump. If you do not get any hot wire then it should be the relay.

Posted on Mar 21, 2009

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SOURCE: 98 Astro Van Intermittant Power to Fuel Pump Relay

I've been bitten by this twice! The culprit both times was the connector plug under the van infront of the fuel tank. the second time the connector pin and socket came loose inside the plug itself,( workes for a while then dosen't). Make sure there is good secure contact made in all sockets in this plug, and the pins are held where they need to be inside the plug itself.

Posted on May 29, 2009

  • 88 Answers

SOURCE: starts runs realy rough then dies put new fuel

It sounds like you already solved your problem. Attach fuel gauge to fuel rail pressure line and monitor for fuel pressur (above 30 p.s.i. @ crank). If pressure low suspect pump. If pressure o.k. but dies out and pressure drops but restarts, check oil sending switch as this controls fuel pump. Computer primes pump for start, then oil sender powers up pump for normal operation. Check for oil leaking at terminals on sender. Also check plug connector at fuel sender on tank as they are known to melt and fail. If fuel not problem, check for spark as ignition module failure is common. Have obd2 diagnostic run to check for codes as this may help with diagnosis.

Posted on Dec 26, 2009

  • 645 Answers

SOURCE: have replaced fuel pump, relay & fuel filter.

have you checked to see if you have a bad came or lifter. that would make it backfire. if it kind of spits fuel it maybe cam. if it throws fire than it could be timing like a bad chain.

Posted on Feb 12, 2010

  • 109 Answers

SOURCE: fuel pump relay is not

Ok im a little confused. You said fuel pump relay is not picking up. Do you mean it is not engaging ( clicking)? If so then if you replaced it you should check to see if power is coming to your relay. The relay has two power sources; one is a constant source that is used when the relay is closed. The other is a power source that turns on a magnetic field that closes the other side of the relay. That is the clicking noise you hear. So when you say you close the relay im assuming you use a jumper wire and connect it from one end to the other and bypass the relay to turn the fuel pump on. Find a multimeter and turn it to volts and connect the ends of the multimeter to the side of the relay that is the magnetic field and check for voltage. you will have to take the relay out and stick the ends of the multimeter where the relay plugs in. To find which side the magnetic field is on you can go to alldatadiy.com and purchase a manual for the car or sometimes the relay has a picture on the back with numbers that tell you which side the magnetic coil is on. the picture of the magnetic coil looks like a curly pigs tail and the other side will have a picture with a line that is split with one side of the line open at an angle. connect it to that side and see if there is 12 volts on it when you turn the engine over. If not then you have a broken wire or possibly a fuse blown

Posted on Dec 29, 2010

Testimonial: "I checked for fuse and it is good, I will trace wiring and check output of the PCM. Thanks for your help"

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Try this first, and lets see what happens. Turn key to on, but not start, then off. do that about four or five times, then try to start. See if it starts, runs, then dies. Let me know. Have you had fuel pressure tested at all? If it doesn't start and run for a short while at least, take air intake hose off at throttle body intake, open throttle and spray a good shot of WD-40 into throttle body, then try to start. If it starts, you have a fuel delivery problem, maybe fuel pump or plugged filter would be first to check. Just because you hear the pump, doesn't necessarily mean it's getting proper pressure to run. Let me know what happens when you try this, and we'll go from there.

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It sure could be. But, first...by "won't turn over" you do mean it cranks at normal speed but won't start?
A simple test of the fuel pump is to stand by tank and listen as someone turns key to on. When first turned to on, your pump will activate for 2 or 3 seconds, pressurizing the fuel system, and then shut off if the engine computer doesn't get a cranking signal. Do you hear it come on? If not, then something's not turning your pump on. If you can hear it buzz on briefly, then maybe it's your filter. Another test: Spray a little starting fluid into your intake manifold (remove the big hose going into intake manifold) while someone tries starting it.If it doesn't fire and try to stay running, then it's probably an ignition problem. But if it does fire off, then you know it's a fuel problem-likely your pump or filter. good luck.

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Hyundai 2003 Santa Fe 2.7V6 - engine turns over fine, doesn't seem to be getting fuel immediately. Eventually it starts after 5 or 6 seconds of turning over. Suspect fuel filter or fuel pump?


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Then the pump may have gone. One common cause is driving with 1/4 or less tank of fuel. Fuel in the tank is very important now days as it keeps the pump thatis inside the tank cool.
Also if you turn the key and don't hear the pump, wait a few seconds before turning it again. If you turn the key off and on too fast the system does not respond that fast.

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You not telling us anything

Is the battery charged & fairly new?
Does the starter even turn the engine over?
Do you have spark & are only missing fuel?
Do you hear the fuel pump run

What engine
Who will be working on the car

How would we know what works & what doesn't
All we do is guess,but need some thing to do that

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I had a Cadillac under warrantee & had to tell the
dealer what to do,so you know my feelings about them

I suspect the fuel pump failed

The pump running doesn't tell you anything

A pressure gauge on the shrader valve, on the
engine will be a good start & you could drive it
with the gauge taped to the windshield

So all these shops & a dealer,just told you to go home
they don't care? Sadly I know the routine

No you have to make sure your just looking for fuel &
not a bad crank sensor etc. If you get no crank signal
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You have to find the right shop,apparently not an easy
feat in your area.

Some vehicles need an oil pressure switch to actuate
the fuel pump

I am just throwing out generic suggestions here,not nec
your cars systems

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