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1996 Toyota Corolla Question: No voltage to fuel pump, sending unit not working either.

 

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2Dogs2, 1.8L 4 Cylinder, Potwin, KS, May 09, 2013, 06:24
 Rookie

Changed fuel pump relay in fuse box, still no voltage. Getting spark to plugs. Car was running when parked, sat for about 5-6 months, when tried to start, no fuel pressure.

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  • Answer #1

    Greg's Orange Auto (13030 Answers) , Orange, CA - (714) 361-9386
    globalhelper May 09, 2013, 06:55
     Master

    did you ck all fuses?

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    2Dogs2, May 09, 2013, 08:37
     Rookie

    Yes, checked all the fuses I could find, under the hood and left kick panel. All were good.

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  • Answer #2

    goodguy May 09, 2013, 07:10
     Master

    check for broken power wire or a bad ground at sending unit

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    2Dogs2, May 09, 2013, 08:39
     Rookie

    Harness plugs right into fuel pump and sending unit which is all one unit in the tank. All connections are good

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    pushrod, May 09, 2013, 09:29
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     Master

    I agree with both 1&2,, i am sure the connections are good!! That should not have changed form sitting for awhile. But a broken 'chewed' on wire can short and blow a fuse so both are correct.

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  • Medium-star Best Answer
    pushrod May 09, 2013, 09:00
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     Master

    Are you checking it at the pump connector under back seat with a tester (test light or volt meter)?? Try it while someone cranks the engine to see if pump voltage now present. Engine must be cranking for 'pump' voltage. Just turning the key on dont work here even for a couple of seconds. If no voltage on ANY wires see answers 1&2. Should have power to gauge sender with key on if harness and fuses are intact. Mice love to chew on wires when one sits around for awhile! Since spark is ok, EFI system should be too.

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    2Dogs2, May 09, 2013, 13:55
     Rookie

    I checked it with a meter with the key in "on" position. I did not try it with the engine cranking. I had no voltage on any of the wires. I'll check it again with the engine being cranked. When I pulled the inspection plate, there was a mouse nest here and I thought, this will be an easy fix cause they've chewed the wires but there were no gnaw marks on any of the wires, perfectly smooth.
    Because I had no voltage at all, I figured something else must be amiss.

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    pushrod, May 09, 2013, 14:30
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    No signs of gnawing that you could see!! Sure your meter was grounded good and set to DC or Autorange scale? Try a test light. Let us know what you find out and good luck!

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    2Dogs2, May 10, 2013, 08:44
     Rookie

    There is only about a 4" piece of this harness between the inspection plate and the fuel pump. Everything else is inside the car and most of the exposed wire has a wire loom over it. I'll use a test light next time and see if it makes a difference. My meter was a digital multimeter set to 20VDC.

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