Fuel Pump Diagnostics |
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Fuel Pump Diagnostics |
solex |
Mar 21 2010, 12:40 PM
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#1
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Senior Member Group: Members Posts: 789 Joined: 12-January 05 From: Long Island, NY Member No.: 3,439 Region Association: North East States |
Hi All,
Need a little help to diagnose a fuel pump problem in a 75, I do not hear the pump when I turn the key to the run position. The car was running, I had a few occasions where it would not start, let it sit for a few days and it was start right up. The grounds: under the relay board, battery and transmission have all been cleaned. All fuses are good. The relay is working as I can hear it click into position. When the key is in the run position relay terminals 30 and 85 shows 12 volts. Terminal 86 show 0.03 volts and terminal 87 show zero volts. There is no voltage at either of the fuel pump terminals. The readings at the relay is counter to to what Haynes states (86 should read 12 and 85 should be ground). I not sure where to check next, really do not want to pull the tank. Any assistance would be appreciated. Thanks, Dan |
solex |
May 15 2010, 03:24 PM
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#2
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Senior Member Group: Members Posts: 789 Joined: 12-January 05 From: Long Island, NY Member No.: 3,439 Region Association: North East States |
Back on this again. Took the car out a few times today I decide to go a little longer ~20 minutes in 70 degree weather. Car ran fine, shut it off to have some one take a look at doing some PDR sat for about 20 minutes went to start it and it would not start.
The fuel pump was not working, it did not recirculate for 1.5 seconds in the on position and jumping the pins on the relay did not work either. Tried tapping the pump but still no fuel. So I had it flat bed'd to my house by the time I got home it start right up. Is is possible that the fuel pump is on it's last legs (btw this is a 75 with the pump up front)? What is a good alternative to the pump, I would guess that a new OEM is NLA? Thanks, Dan |
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