Re: How do i find out if my fuel pump is going out
A noisey fuel pump can be an indication of a worn pump. You have to do a fuel pressure test to determine if the pump is supplying proper pressure and volume
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Check that is battery voltage at the pump relay, with the ignition on the relay should click in and there should be battery voltage at the cable going to the fuel pump , If all is correct there check for a broken cable to the fuel pump
www.agcoauto.com/content/news/p2_articleid/195 The pump is the heart of the fuel pump module and does the work of moving ... Abad fuel pump could cause any or all of the symptoms below: ... This is unfortunate as fuel quality is a real problem and a clogged filter may mean a new fuel pump. ... Fuel with ethanol will go through phase separation if it remains too long in ...
vehicles have a safty device that kills the fuel pump in case of a roll-over accident so the fuel will not be poured on to the car and ignite. also, this fuel pump kill switch is used when you are going to remove the fuel pump to de-pressurize the fuel line by cranking the engine while the fuel pump safety switch is off. you can restore the power back to the fuel pump by resetting the fuel pump safety (kill) switch. some are located in the trunk, by the fender well, behind the carpet. some are located inside the kick panel where the front passenger sits. check your motor manuel for that vehicle or ask a parts person at the dealership for the location of the safety switch for the fuel pump.
first check fuel pressure with a mechanical fuel gauge that attaches to fuel line schrader valve. around T.B.I. if no pressure with key on check fuel pump relay for correct operation, and also the oil pressure switch has the fuel circuit to it so possible oil pressure switch also. fuel pump has a check valve to keep fuel from going back to tank, so when u turn key on fuel pressure should go up within 1-2 seconds on gauge. if fuel pressure goes down quickly, possible bad fuel check valve, change fuel pump and fuel pump check valve (located right above fuel pump inside tank)
CHECK FUEL PUMP FUSE AND RELAY IF BOTH OKAY CHECK TO SEE IF POWER GOING TO FUEL PUMP IF YES FUEL PUMP FAULTY.IF NO POWER GOING TO FUEL PUMP MORE LIKELY FUEL PUMP WIRE HAS A SHORT OR OPEN CIRCUIT.
the fuel tank sending unit is defective in your van, this has nothing to do with the fuel pump going out, this was a 100% incorrect statement by the shop that said this, but do understand that if you pull the fuel tank to repair the defective sender for the gas guage u might as well replace the fuel pump which also is in the fuel tank, they (the pump) are are getting worn out at about the miles you have on this car.
first you need to test your wires going back yo the fuel pump inorder to see if you have a bad wire or not.. does the fuel pump initilize upon turn ignition on . if yes then you need to chk possible spark issuie . if no initilize then test connector at the fuel pump and work your way back to the fuel relay swtch and if that tests out work your way back to ignition switch . ( s/b only 1 relay )
Unfortunately most likely your fuel pump is going out. Tahoes are notorious for the fuel pumps going bad. One word of advice spend the extra money on a GM fuel pump and don't go with aftermarket because the labor is quite expensive and if the new pump goes out in six months you are out all the labor again.
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