1989 Ford Taurus fuel pump doesn't work through relay

ARTHARK

MEMBER
1989 FORD TAURUS
6 CYL
2WD
MANUAL
16,000 MILES

Car is a SHO. Had drivability problems, missing, running rich ( black smoke). Car would buck, miss, especially on left turns. Car quit. Get spark on #4 cyl. Replaced fuel pump and get it to run with battery power to #5 pin on harness. Replaced Integrated Control Module (relay). Pump doesn't operate with key on. Engine fires up with starting fluid.

4 Replies

2CARPRO JACK

MECHANIC
11,533 POSTS

In th etrunk above th eleft wheelwell is a fuel pump inertia switch. Try resetting it by pushing button. See if you are getting power to it with key on, and if you are then be sure power is going through the switch

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Tuesday, January 15th, 2008 AT 7:25 AM

ARTHARK

MEMBER
4 POSTS

I checked the inertia switch early in the game. I'm using a Haynes manual wiring diagram to describe what I've done. With the key on I get 12 v. To pin #13 in the Int. Cont. Module harness. If I jump #13 to pin #5 I get the pump to run. Therefore, I think all is OK to pin #13. I just can't get the relay to do that. It's new NAPA-Eichlin. I should add that my son couldn't hear the injectors "clicking" with a stethoscope when I cranked the engine.

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Tuesday, January 15th, 2008 AT 4:29 PM

2CARPRO JACK

MECHANIC
11,533 POSTS

Need a"noid" light to do the injector check. Is the ground circuit good for the fuel pump relay?If so, see if the trigger grounds when key is turned on. It will only stay on for a few seconds so be ready

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Tuesday, January 15th, 2008 AT 4:33 PM

ARTHARK

MEMBER
4 POSTS

I have a noid light but it looks virtually impossible to get at an injector harness without removing the secondary manifold on top of the engine. I did it already to get at the connectors in back so I'll wait on that. I'm not familiar with "triggers". The fuel pump relay is one of four encased in the module and I believe that it grounds to the core support while it is attached to a mounting bracket. I did wire brush the bracket and attachment points to give it a good contact.

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Tuesday, January 15th, 2008 AT 4:47 PM