I'm doing a few things and found these sitting in the engine bay. Are these the fuel pump and air conditioner relays? If they are, shouldn't the fuel pump one click when I turn the ignition over?

If they really are what you are asking, they are very far from where they are supposed to be... they should be mounted to the firewall near the air cleaner housing.

Yes the fuel pump relay should click on and run the fuel pump when you turn the ignition on and then click off again about 2 seconds later if you don't start the car right away.

[This message has been edited by carbon (edited 02-25-2010).]

Thats both the Fuel Pump & AC relay.

If you un wrap some of the tape from the wires, the fuel pump relay is the one that has orange wiring coming out of the relay plug.

Hope this helps.

OK, thanks. So if it doesn't click then I need a new relay?

AC & Fuel pump relays use the same relay. More than likely one of them will still be good. Switch them out and try, if it clicks then you know you have a bad relay.

-cw

I just tried that and neither of them clicked... so that means both of them are bad, right?

Most likely both didn't just happen to go bad. The execption to that is that these are supposed to be mounted, cover up, on the firewall. If these sat upside down, and then they filled with water, that could have ruined both of them. One thing you could do is buy a new relay, and see if that solves your problem, or at least clicks. But overall when both do the same thing, that points to the idea that your not getting the voltage from the ECM to turn on the relay. Might be either one. If these were upside down when you started, I think I'd try a different relay.

quote Originally posted by phonedawgz: Most likely both didn't just happen to go bad. The execption to that is that these are supposed to be mounted, cover up, on the firewall. If these sat upside down, and then they filled with water, that could have ruined both of them. One thing you could do is buy a new relay, and see if that solves your problem, or at least clicks. But overall when both do the same thing, that points to the idea that your not getting the voltage from the ECM to turn on the relay. Might be either one. If these were upside down when you started, I think I'd try a different relay.

I can't remember how they were when I first found them. I think I see where they are supposed to be hooked up. The starts sometimes but other times doesn't seem to start.

They both looked real "gummy" when I took them off.

The fuel pump will run by either of these two conditions

1 - The ECM turns it on via the relay. The ECM will send the two second pulse when you first turn the key on, and will also keep it turned on as long as it sees the engine running. If you try the two second pluse thing several times in a row, it might not happen the second or third time, but if the key has been off for a while (30 seconds) you should always get the two second pluse from the ECM for the first time when you turn the key to on.

2 - There is an oil pressure switch that will turn on the fuel pump when the engine has built up oil pressure. This does not run through the relay. So if you find that the fuel pump turns on after a bit of cranking, and maybe doesn't turn on when starting the engine hot, if because the cranking is not enough to build up enough oil pressure before the engine starts, your fiero might be running on the oil pressure switch only for the fuel pump.

If you're missing the two second pulse, most likely cause is a bad relay. Second most likely is a corroded relay socket.

Drawing of location behind driver on engine firewall. They are standard Bosch 30 amp relays found at the auto parts store for about $11.

The real gummy part is grease put in the connector to help with water proofing.