Question about Cars & Trucks
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.
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
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.
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Posted on Jan 02, 2017
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
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
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
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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