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It wasn't the fuel pump. It is an electrical problem - PLEASE HELP! 700 1990

Ok, my older brother checked out the original fuel pump by connecting it to his car battery - the fuel pump made no sound. My dad and i removed the fuel pump, replaced it with one that we knew was good and then - when the car didnt start checked out the old one. The old fuel pump worked.

The fuel gauge is not 'working' when the key is in the 2nd position. I'm thinking that it is an electrical problem. We have checked the relays, we checked the little black box under the hood (i forgot what it's called), and we checked the fuses.

At this point i am beyond frustrated. I had my licensce for 2 weeks and then my car dies on me.

ALL help is welcome and appreciated.

Thanks again, Elad








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It wasn't the fuel pump. It is an electrical problem - PLEASE HELP! 700 1990

Which fuel pump did you replace. From experience I know that if you changed the tank pump it is very easy to knock a wire off. The ground is through the body of the unit, soldered to the top and quite easy to disrupt if you tried to remove the "plug".

As with any electrical problem a voltmeter is the best tool to have in the tool box.








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It wasn't the fuel pump. It is an electrical problem - PLEASE HELP! 700 1990

Hello Elad; As a previous poster said, check the 700/900 FAQ for more info. But to help you along, I will venture a guess. Assuming that you do not have a Regina fuel system car and have the LH injection,it could be the wiring to the in-tank pump and fuel level sender. There are two fuel pumps, main one under the car and feed pump in the tank. IF the in-tank pump is not working and you have less than a 1/4 tank of gas, there will be little to no fuel available for the main pump to pump. You or someone else needs to check for voltage and current at the wires/connections under the trunk mat for the in-tank pump. Good luck!
--
'94 940 150k, '86 240 170k, '72 142 KIA, '70 144 KIA, '69 144 RIP








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It wasn't the fuel pump. It is an electrical problem - PLEASE HELP! 700 1990

At this point I would suspect the fuel pump relay. A known problem. Fuel gauge sticking, also a known problem. In the FAQs, describes how to bypass the relay to see if that part of the circuit is good.

http://www.brickboard.com/FAQ/700-900/EngineFuelinjection.htm#FuelPumpandFIRelayDiagnosticTests







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