car will not hold volts

1990 FORD FALCON
400,000 MILES
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MURRDIONE
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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.
Sep 27, 2011 at 5:07 AM
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MHPAUTOS
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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.
Sep 27, 2011 at 7:27 AM
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MURRDIONE
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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 .

Sep 27, 2011 at 10:56 PM
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MURRDIONE
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i have tried large,black-yellow & large,black 0n car plug & no volts or do i check with pump out of car.
Sep 28, 2011 at 4:15 AM
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MHPAUTOS
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I will have to get the manual and look at the wiring, i will post what i find a bit later, as i am not at home fore a while.
Sep 28, 2011 at 6:38 AM
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MURRDIONE
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thanks
Sep 28, 2011 at 8:29 AM
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MURRDIONE
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also i noticed that when battery is on battery charger turned on at wall,the most it will charge to is 12.20 volts,when disconnected its 12.04 every time.
Sep 28, 2011 at 11:24 PM
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MHPAUTOS
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I would also get the battery load tested, this is the only way to test the battery condition.
Sep 29, 2011 at 2:29 AM
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MURRDIONE
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battery ok,but which wires do i check ( as i mentioned earlier ) & what position do i have key on & anything else i can check thanks.
Oct 5, 2011 at 5:59 AM