Where is the Fuel pump/ Main relay located at on a 1999 Honda Accord EX 2dr coupe 3.0 V6?


Is it up high on the diver side under the dash? Does it have 1 screw?


Thanks for any help.

 

This site has information on the MFR location towards the bottom of the page.

http://techauto.te.funpic.org/mainrelaydefine.php

 

You can also listen for it.
Clicks when you first turn on the key (fuel pump should start running).
Clicks again after 2 seconds (fuel pump should stop).

 

Thanks for the help.

 

Does this relay control more than just the fuel pump? I have already posted a lengthy message tonight about my problem and I note the lack of both clicking and fuel pump buzzing. But a breakdown guy said he could detect an electrical feed to the fuel pump.

If this relay controls other things and they work, then I could rule out the relay, couldn't i?

 

The "main relay" is really 2 relays inside one plastic case. You can't automatically rule this out 'cause it's possible one works & the other doesn't.

One relay is more likely to fail, it's the one that switches power to the fuel pump.

The other relay switches power to the ECU, including the check-engine lamp; and also switches power for most of the solenoids & several sensors.

Finally, without details about your car, it's not possible to be very specific. I think most years, the main relay switches the positive leg of the fuel pump circuit. But there's other electrical connections back there, for example the sender for the fuel gauge. Do you think the breakdown guy was checking the wrong wire?

 

I now think he had no clue what the five wires at the connector were for. Only one gets 12v when the key is turned and I now know this is for the fuel guage. The positive supply to the pump remains at 0v all the time.