Problem originated with a 'no start' condition. Cranked fine. However, no spark with an inline light at spark plug. I investigated distributor cap, rotor, coil, and everything seemed fine. However, no voltage at coil primary. I then disconnected the wiring harness at the fuel pump, and then had spark. My thought was that the fuel pump was defective and somehow drawing down the coil voltage. I replaced the fuel pump, and sure enough, the old one showed no resistance between + and -. But the problem wasn't fixed with the new pump. The fuel pump relay is sending only 5 to 6 volts to the pump. When the harness at the fuel pump is disconnected, the voltage level rises to 10 volts... But not immediately. In fact, sometimes, I read 5 to 6 volts at the fuel pump relay socket, with the relay removed. Therefore, my question is: where does the supply voltage at the fuel pump relay come from? It must not be directly from the battery. Or if it does, I must have a bad connection somewhere. I've bypassed the inertia switch, so that can't be it.
Also, my new fuel pump started with about 20 ohms between + and -, but now I see its down to about 7. I wonder if my repeated attemps of sending low voltage to the pump is damaging it.
Any help would be appreciated greatly. Thanks.
have the same problem?
Saturday, April 27th, 2013 AT 8:20 PM