Fuel Pump 2 seconds, Fuel Pump voltage |
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Fuel Pump 2 seconds, Fuel Pump voltage |
thompson-mfr |
Mar 14 2014, 12:40 PM
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#1
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Thompson, Ryan Group: Members Posts: 198 Joined: 30-September 08 From: Silverton, OR Member No.: 9,598 Region Association: Pacific Northwest |
I have a 74 2.0L original FI and the fuel pump has been moved to the front trunk. I converted to the in and out style (75-76).
My fuel pump used to go on for 2 seconds to prime, then off until cranking or running. I know this is how it is supposed to work. Mine now is on constant with the key in aux position (before starting/cranking or running) What controls this? The computer? I also have only 7 volts to the pump and 9 volts at the fuse on the relay board that pump power goes through. Good 12+ volts at battery. Finally to the question: Does the computer control this 2 second prime? |
Tom |
Mar 16 2014, 07:57 AM
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#2
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Advanced Member Group: Members Posts: 2,139 Joined: 21-August 05 From: Port Orchard, WA 98367 Member No.: 4,626 Region Association: None |
86 is the controlled ground for the fuel pump relay. Remove the relay and hook up a multi-meter to 86 and ground with the meter on OHMS scale. You should get continuity for about 2 seconds when key if switched on, then it should go to infinity. If this works correctly, check out the relay, it may have stuck to on. With the meter on OHMS check from 30 to 87A and you should get continuity with 30 to 87 being open. Anything else means a bad relay. You can open them up and check the contacts and perhaps clean them up.
Tom |
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