Car will not hold volts

MURRDIONE

MEMBER
1990 FORD FALCON
400,000 MILES

Hello, 1990 ea falcon wagon, auto, carbi type [not multi], well I changed fuel pump & sender unit & fuel relay put 10 lts fuel in, still doing same, when I turn key from lock to 1st position, all OK, then turn to 2nd position fuel gauge goes from empty to full then after a few secs it drops back to empty very fast, cant here pump as still no fuel pumping, also now the battery volts dropping very fast, it would drop to 0% if leave on, repeated with pump disconnected still the same, battery only 1yr old, tryed to jump start but battery looses starting all needed volts to start, even when I charge battery again & again, all this started after 900 k drive, I will try one full night charge & I will try again please help, as I need to get back home thanks.

8 Replies

MHPAUTOS

MECHANIC
31,937 POSTS

This is actually a centre point injection system, have you checked for voltage at the fuel pump, it will only cycle for 2-3 sec with the ignition on engine not running, check this first.

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Tuesday, September 27th, 2011 AT 7:27 AM

MURRDIONE

MEMBER
6 POSTS

Hello mhpautos, there are four wires from f/pump, here how there coloured coded from plug on car to fuel pump plug (small, yellow-green to large, yellow)then (large, black-yellow to large, red) then (small, black to large, black) then (large, black to large, black), which wires do I check with multimeter & had battery on charge 5 hrs last night, while charging & when taken off 12.04 volts let sit, (in morning dropped to 11.86v while not on charger)will not turn car over, I will check fuel pump if you can tell me which wires to check thanks.