98 Mustang Fuel Pump Won't Power Up

Hello everybody, I have a question I'm hoping you can help me with. I have a 98 Mustang GT. Completely stock, sorry. The problem I'm having is that the fuel pump will not power up. I traced it and I have no power at the pump, none at the inertia switch, and I don't have anything coming out of the multiple relay box. I'm not sure if that is the right name for it, it is the box that is found inside the passenger fender space. I even replaced it, at the tune of $150, and it didn't help. If somebody out there thinks they can help I can give exact wire numbers that get power and wires that don't. As it stands right now, the only way I can get the car to run is to run a jumper wire (with a fuse, I know, still not a good idea) to I believe wire number 5. That is the wire that comes out of the fuel pump relay, and powers the entire fuel pump circuit. When I do this the car runs fine, I just want to fix this right. Also, I took the car to Autozone to have the codes pulled, I don't know OBD-II, and it spit back no codes. Finally, the night before the problem started, my girlfriend claims she heard a clicking noise that seemed to come from the right rear of the car. I didn't hear it, but I'm not totally discounting it either. As you guys can tell, this is a problem that really has me frustrated. I posted this question to other web forums and got either no answers or really strange ones. I'm hoping you guys can help. If there are any ideas out there and you need me to check anything else, I'm totally game. Any more information you guys need I can supply. I appreciate any help you can give.

nyuk98gt said:

ajoyce76:

I think you answered your own question: when you bypass the relay, the pump will run. So, the relay has gone bad and needs to be replaced.

If you don't want to spring for a shop manual (+$100), get a Haynes manual (less that $20 at AutoZone); there are wiring diagrams near the back along with lots of other good info.

Click to expand...

Hey everybody, I'm sorry I took so long to respond. Anyway, it is no the relay. The relay is in the constant control relay box. It has to wires feeding into it. One wire is hot all the time and the other only goes live when the relay needs to click over. The wire that is supposed to be live all the time isn't. I think it's wire number 9. I don't understand what has happened. This occured out of the blue. I have been on every forum, went to allexperts.com, and nothing. Is this such a freakish problem that no one else has had it happen to them. As far as the manuals go, I have a Haynes and a cheapy Chiltons ($20 at Autozone) and both of their wiring diagrams are useless. They only show the diagrams after the CCRM(constant control relay module), and they show the wires going into it, but only so you see their numbers. I think this wire may come right out of the ECM. I can't figure this out. If anybody has any input I would be more than greatful, otherwise I give up.