2000 Oldsmobile Alero Fuel Pump

QUSSAY.ALOBIEDY

MEMBER
2000 OLDSMOBILE ALERO

Electrical problem
2000 Oldsmobile Alero 4 cyl Front Wheel Drive Automatic

Dear Sir,
Good Day,
Hope you doing well.
I have problem with my Alero 2000, the problem with the Fuel Pump and the details as follow.

Fuel pump doesn't work, but when I give it 12V from the Battery I found it working I checked the fuse board I found fuse # 48 (F/P INJR) fired, I changed it, but the fuel pump still not working
Also I switched relay# 18 with relay# 21, but the fuel pump still not working when connect it in its place! I

Also I did this test and I have these results:
1) Red lead of the Multimeter in the positive of the battery, Black lead of the Multimeter in the Pin#30
A) When the key off, Multimeter read 12.49Volts
B) When the key on, Multimeter read 0.01Volts

2)Red lead of the Multimeter in the positive of the battery, Black lead of the Multimeter in the Pin#85
A) When the key off, Multimeter read 12.49Volts
B) When the key on, Multimeter read 12.25Volts

Please what is the problem?
please help
Warm regards,
Qussay AlObiedy

1 Reply

INTERNETMECHANIC

MECHANIC
700 POSTS

You may have an injector problem? Unplug injectors, then see if voltage reading improves. My info shows 87 carries voltage to switch/load side of relay, sometimes wiring diagrams get 30 and 87 reversed, doesn't matter as long as there is continuity between those two pins, when relay is energized. Both should be hot, when relay energized.