Where is fuel pump relay located on 90 SC?

I checked the fuse in the underhood box, and the inertia switch. Before I drop the tank I'll put in a new relay. Where is it though and which one. I looked online and it says a GP Sorensen MR-12 is the relay, so I'll go get one.

In the trunk on the left hand in the area of the inertia switch. If I remember correctly, the one with the pink with black stripe wire is the one you need to be looking for.

birds4us said:

In the trunk on the left hand in the area of the inertia switch. If I remember correctly, the one with the pink with black stripe wire is the one you need to be looking for.

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Correct me if I'm wrong but sc's didnt have a fuel pump relay. It was actually part of the IRCM and there wasn't a fuel pump relay by itself. I think only the 5.0 birds had a fuel pump relay and maybe early 3.8na's. I know for a fact my 94sc didn't have the relay but maybe the early models did but I don't think so.
Dan

You are wrong Dan. The EEC power relay is inside the IRCM, but the fuel pump relay is in the trunk. 4 wires, white, tan/ lt green, black/yellow, and pink/black wires. If you would like a pic let me know.

birds4us said:

You are wrong Dan. The EEC power relay is inside the IRCM, but the fuel pump relay is in the trunk. 4 wires, white, tan/ lt green, black/yellow, and pink/black wires. If you would like a pic let me know.

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Then early models are indeed different. I have two wires on the inertia switch one goes to the pump itself and the other goes to the ECM. I know the wires you are talking about because I did a 5.0 swap and I needed to add a fuel pump relay to my 94sc so 9495s don't have a fuel pump relay it is inside the IRCM early models must be different.
Dan

'89 thru '92 us and IRCM and a separate fuel pump relay located in the trunk. '93 and later use the CCRM and fuel pump control is in the box.

Well I changed the relay today. Nothing. Got to drop the tank now and check voltage at the pump with the key on. I am going to run down to Bill E's tomorrow morning and pick up a 255 pump.

Scott Long said:

Well I changed the relay today. Nothing. Got to drop the tank now and check voltage at the pump with the key on. I am going to run down to Bill E's tomorrow morning and pick up a 255 pump.

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just curious as to why you thought it was the relay in the first place and not the pump itself? You could always just give 12v to the Pk/bk wire on the enertia switch and that should trigger the pump

Relay is 17 yrs. old, pump is 3.

Oh well it has a new relay now.

I spent the past 3 hours fighting this car. I got it up on a lift and had to cut the bolts on the resonator to rear section flange, then fight with the pipe because it was rusted up so I got a torch and heated it up till I could seperate the exhaust. Then I had to fight with the exhaust hangers, fight with the heat shield bolts, fight with the strap bolts. I have the tank sitting on a big lower cradle type engine hoist but I can't get the 2 smaller hoses off of their mounting spots. Damn thing is not wanting to come out. I am so tempted to put a fuel cell in this car.

Scott Long said:

Relay is 17 yrs. old, pump is 3.

Oh well it has a new relay now.

I spent the past 3 hours fighting this car. I got it up on a lift and had to cut the bolts on the resonator to rear section flange, then fight with the pipe because it was rusted up so I got a torch and heated it up till I could seperate the exhaust. Then I had to fight with the exhaust hangers, fight with the heat shield bolts, fight with the strap bolts. I have the tank sitting on a big lower cradle type engine hoist but I can't get the 2 smaller hoses off of their mounting spots. Damn thing is not wanting to come out. I am so tempted to put a fuel cell in this car.

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I wouldn't be suprised if the pump went. Hell my 255lph walbro lasted about 2hours

Ok put the new pump in, put the tank back up, plugged in the connector....

Key on: gas level gauge reads proper, but pump won't run. Doesn't even prime. I swapped the old relay back and no difference.

My connector at the tank was all broken so it's directly wired to the prongs on the lid. I put a ton of die-electric grease over them to keep moisture out. I'll get a new harness and connector but I want to make sure it runs.

I don't know what to do now? Re-wire the pump w/ it's own relay? Is a 30 amp relay enough to run the pump? What about a 30 amp inline fuse and 12 ga. wiring? Sound like a plan? I can trigger the relay with something switched w/ the ign. But if the pump runs anytime the key is on then, would it automatically re-circulate back to the tank or would it build pressure at the rail?

If I put a fuel cell in, could I use the BRAND NEW 255 LPH pump that I bought today? What about fuel lines can you use the stock ones or do I need to go to like -8 or -6 and run new up to the fuel regulator and rail?

This car is pissing me off!!!!