Question about 1990 Honda Prelude

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90 Honda prelude is not getting fuel from the back to the front. Already put on new filter and pump. Still wont get to the front. So right now I have a wire going from my pump to my battery and when it wont start I touch the wire to the battery and fuel will run to the front then it will start. What would that be ? Also blew a water hose, changed it, now sometimes it acts like it has no power. Like its not getting gas annd its gonna die. But then it will start going again ? I opened up the bleeder and made sure there was no air in there. What cld that be ?

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  • Ronnie L Hill Mar 21, 2011

    The fuses are good, I checked them all. Im not sure about the relay. Ill have to check it. Thanks for your help.



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Check the ECM main relay. It supplies power to the fuel pump and the injectors. If there is no power to the pump this is the first thing I would suspect. I believe it is located up under the drivers side of the dash and the very drivers side.

Posted on Mar 20, 2011

  • 2 more comments 
  • Ronnie L Hill Mar 22, 2011

    The way I have it now is I have a wire going from the pump to my battery, if it wont start I put that wire on my battery for a few couple seconds and the fuel runs from the back to the front then I start it and take the wire off and it still runs. It will run for a few days before it does it again. If it was the relay wouldnt it stop running as soon as I pulled the wire off the battery ?

  • Jeremy W.
    Jeremy W. Mar 22, 2011

    Usually what happens is the solder joints in the relay break. The usual symptom is the vehicle won't start when it sits outside when its warm and sunny. It will start every time in the morning.

    What you need to do is check for power at the pump when it does not start. If there is no power than immediately go to the relay and see if there is power out of the relay on the wire that goes to the fuel pump. If there is check for power to the relay from the fuses. If power is good from the fuses than the relay is bad. If there is no power from the fuses than I would check into the ignition switch as a possible culprit. It is not uncommon for them to fail as well.

    I'm thinking that the solder joints are bad and the introduction of voltage on the circuit might me heating up those joints and causing a better connection. Or the fact that the relay is being commanded on while the pump is running and it is heating up enough to allow a good connection and then supplying power on its own. Just a theory but you will need to dig in to see what is going on.

    I couldn't tell you how many of those I have replaced in the past. Both the relays and ignition switches.

  • Ronnie L Hill Mar 29, 2011

    I took out the main relay and looked at it with a magnifying glass and found a couple of places where it was cracked. So on the ones that were cracked I put a lil bead of solder on them to it would fill the cracks and get a connection. It worked good, my car had power for a few days. Now last night my daughter had it and was driving down the freeway and she smelled something funny then the car was getting no power and she pulled over and it shut off by it self. So I dont know if its the relay again or maybe something else. Do you think the relay could of burnt up. She said the smell was like a sweet smell. Kinda odd to me.

  • Jeremy W.
    Jeremy W. Mar 30, 2011

    A sweet smell would normally be caused by a coolant leak. Are you sure it didn't overheat and stall.


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You basically answered your question, there's no power getting to the pump when the factory harness is connected, so check the fuse for the fuel pump and also the fuel pump relay this could be the cause if there was a short in the wiring it would surely blow the fuse. As for the hose problem, are the hoses colapsing when running, if so its a air pocket or possablly a stuck open or closed thermostat.

Posted on Mar 20, 2011


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