Question about 2002 GMC Sierra

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2002 gmc sierra, fuel pump comes on for 2 seconds or so when key is turned on but no fuel pressure

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Pump may come on and hum but not pump-- try replacing fuel filter first may have a total plugged up filter, check pressure if still no pressure than will have to replace pump [either seized or plugged up ] but will still have to remove it to check

Posted on May 31, 2010


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When the key is on, should the flow from my gasline remain constant or back off. Or does it back of cause it is nolonger a pressurized system?

The pump should turn on for 2 seconds with the key in on position. Then the computer will turn the pump off, and won't turn it back on until the engine is cranking. The 2 second period is to put pressure in the line and the fuel rail. It should hold pressure for about 15 or 20 minutes that way, before slowly bleeding off. It sounds like yours is working right.

May 24, 2014 | 1991 GMC Sierra

1 Answer

No fuel pressure from fuel rail gmc 2000 sierra 4.8 vortex

you have a problem with the fuel pump circuit. Check fuses then relay activation when you turn the key on. You should hear a buzzing/whirring sound coming from your gas tank. If you dont, take a rubber mallet and smack the tank a few times. if the pump activates then the problem is with the fuel pump itself

Aug 08, 2013 | 2002 Chevrolet S-10

1 Answer

My 2007 gmc sierra quit and has no fuel pressure

A lot of GM vehicles will start for a few seconds then turn off, it's due to the VAT System. Vehicle Anti-theft System. The most common procedure to relearn the key to the BMC is to: 1.Put key in turn to the ON position, security light should come on and stay on, wait 10 minutes, light should go out.
2. Turn Key off, wait five seconds.
3. Repeat steps 1 and 2; 3 times, it will take you 30 minutes to do this, but I've have multiple vehicles that this solved the problem. It's most common when changing wiring harnesses, BCM's, and steering columns.
4. After the third cycle of turning the key on and off for the appropriate amount of time, you should be able to crank it over and it will stay running.

Keep in mind, this is if you're fighting a computer problem,not general maintenance. Hope this helps!

May 11, 2012 | 2007 GMC Sierra 1500

1 Answer

My 2002 yukon cranks but does not start on 1st trun of key but will on 2nd?

Turn the key on and listen for the fuel pump to run for about 2 seconds. If you don't hear it run the may be a problem with the fuel pump relay or its cicuit. The extra cranking from the first and second try builds up oil pressure and that will energize the pump through the oil pressure switch.

If the pump runs for the two seconds try to start it on the first key turn. If it still does not start there may be a pressure or deleivery issue. So many vehicles no longer have external servicable fuel filters, yours may not. If it does though you may want to change it.

Also, does a security light come one and saty on in the dash?

Oct 04, 2011 | 2002 GMC Yukon Denali

1 Answer

My truck wont start the fuel pump dosent hum when yoyu turn the key on but the fuel relay clicks. can the relay be my problem instead of the fuel pump.?

check the 3 main components needed for a vehical to run. check your spark. pull a spark plug out. check your fuel pressure. there is usually a fuel rail pressure release. and i dont see the problem being air so just check those 2 things and get back to me

Jun 16, 2011 | 2002 GMC Sierra

2 Answers

1998 gmc 2500 sle 5.7 wont stay running

Theres only one fuel pump relay, unless you have dual tanks. Be sure you have 55-60 psi fuel pressure. I "think" the oil pressure switch supplies power to the fuel pump after the engine is running.

Dec 14, 2009 | 1998 GMC Sierra

1 Answer

Fuel pump- 2002 GMC Sierra

The fuel sending unit only controls the gas guage not the fuel supply to the vehicle. The pump is twelve volts. If you are not getting twelve volts on the PUMP wires check the fuel pump relay and the key circuit to it. If you have to cycle the key three to four times rapidly to get the vehicle to start check the fuel pump pressure at the regulator for manufacturer specs. An injector stuck open will also cause same problems you are describing.

Jul 30, 2009 | 2002 GMC Sierra

1 Answer

2000 gmc sierra fuel pump

Orig factory electric fuel pumps turn off seconds after loss off oil pressure

Mar 28, 2009 | 2000 GMC Sierra

3 Answers

2002GMC sierra truck turns over for few seconds but want start.

need to check your fuel pressure....sounds like a bad fuel pump

Feb 08, 2009 | 2002 GMC Sierra

1 Answer

Our 2002 gmc sierra 4x4 truck stopped while we were driving. Is there a fuel shut off switch somewhere that might have been engaged?

If its fuel related, it is most likely the fuel pump inside your tank. You can listen for it by having someone turn the key to on (not start) while you listen by the fuel tank. You should hear a buzzing sound for about 5 seconds. That means the pump is turning but is not really a good indication of pump pressure.
If you don't hear the pump run, I would check power to the pump first before you buy one. I think the whole tank unit is about $150.
Good luck

Jan 18, 2009 | 2002 GMC Sierra

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