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My 2002 chevy tahoe has a gremlin. it wouldn't start last week. I checked the fuel pump relay and when I plugged it back in the tahoe started. now when it won't start I unplug the relay and plug it ba

I have gotten 2 new fuel pump relays and the problems persist. it's an intermittent problem. some days it starts up right away, some days I have to pull the fuel pump relay, put it right back in and it starts right up.The problem happens, or doesn't happen regardless of the weather or temp, if it's been running or not.

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  • Ivan Romero
    Ivan Romero Jan 05, 2016

    Did you ever resolve this issue? I am curious. Mine is doing the same except I haven't unplugged the relay yet. It will just start up later or the next day.

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2 Answers

Tell a repair shop that knows the answer to
your relay removal routine

If you had a wiring diagram, you could see what
happens when you remove the relay

Posted on Nov 17, 2014

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  • Cars & Trucks Master
  • 3,218 Answers

The problem may be in the relay box internally as a bad connection. You need to determine what is not there circuit wise. The relay should be a 4 pin relay. One pin in the relay box needs battery power all the time. One pin needs battery power with the key on. One pin needs a ground and the other goes to the fuel pump. When vehicle doesn't start the pins need to be tested for both powers and the ground supply to see what may be missing and repair from there. You can try tapping on the relay box to see if it may help a loose connection internally.

Posted on Jan 05, 2016

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SOURCE: 2005 Chevy express Fuel pump relay meltdown 6.0L

i need diagram for fuse box 1998 chevy van

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SOURCE: 90 jeep starting problem

Check the crank position sensor. I had the same problem in a 1989 cherokee 4.0, and the solution was simply to acomodate the sensor wiring. No replace was necesary

Posted on Jun 11, 2009

  • 1 Answer

SOURCE: 1996 chevy tahoe fuel system

i am having the same problem with my 96 pickup i am getting low voltage to my fuel pump i have traced the wires back to the front the purpel wire is the one with low voltage i replaced fuel pump also fuel relay and still have low voltage

Posted on Jun 22, 2009

  • 61 Answers

SOURCE: 1995 Town Car cranks but won't start, intermittent problem

First, try swapping the eec relay with a known good unit and see if the problem persists.
Second, you could be experiencing a problem with your ignition module overheating, causing high resistance in the circuit. When the vehicle sits for a while, the circuit cools and will allow the current to flow again.

Posted on Jul 24, 2009

Yuma Duner
  • 5 Answers

SOURCE: Intermittent fuel pump engagement when turning key - 2001 Taurus

try cleaning the connector that goes to the fuel pump, sometimes they corrode on inside. If that does not fix, test the wires feeding fuel pump with a multi meter until the condition shows itself again, if voltage drops to zero or very low then wiring problem, if voltage is unchanged with problem and fuel pump is not working and connectors are all clean, try replacement of fuel pump.

Posted on Oct 09, 2009

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