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Fuel Pump questions on 79-80 900T
Posted by BreckSaab [Email] (more from BreckSaab) on Wed, 10 Oct 2007 19:54:38
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Ok having some fun with the fuel system on my 80 900T. After a lot of testing, I had to replace fuel pump relay and a fuse. The car started fine, but would start to miss, then would be hard to restart. I changed the fuel filter, i removed the fuel pump and cleaned the screen in the pick-up area. Same problems. So I tested the voltage at the pump when only the pump was running, using the jumper trick, only 10.5-11 volts. I tested the voltage while the pump was running and it fluctuated between 9.8 and 11. It would first be at 10.3 then go down a tenth at a time then would go up to 11, then back down to 10. these changes were gradual. The pump makes it usual hummoing sounds but every once in a while it will get louder, kind of like it is buzzing.
Is it just my pump? Wirring? Help
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