Fuel Pump - Need Help, trying to fire up my barn find for first time...no fuel |
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Fuel Pump - Need Help, trying to fire up my barn find for first time...no fuel |
willimac |
Sep 14 2014, 07:48 PM
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#1
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Newbie Group: Members Posts: 14 Joined: 14-September 14 From: minnesota Member No.: 17,901 Region Association: None |
I'll try to keep the story short. I have a '74 1.8 L-jetronic 914 that I rescued from a barn in central Wisconsin almost 3 years ago. It had sat for over 20 years and become a palace for generations of barn mice, who built nests in every available cavity. Since then I've been sporadically cleaning it up, vacuuming mice and their nesting material, dropping the engine, dismantling and rebuilding it, cleaning up rust, shopping new parts (alternator, starter, stainless fuel lines, seals and gaskets) re-boring the cylinders, splicing chewed-through wiring, etc... finally got it put back together this week and am having trouble with the fuel delivery. The fuel pump does not turn on.
There is power to the double relay switch - terminal 86a checks out with the ignition switch on start, zeros out in "on" position , and AFM resistance checks out. The terminals at the fuel pump plug read zero volts unless the ignition is turned to "start" and the AFM is propped open - in which case it reads 7 - 8 volts. Don't know what to do---is there a way to test the pump to see if I need to replace it? Why would only 8 volts be making it to the terminals for the pump? Is this possibly a problem with the double relay switch? Any help would be greatly appreciated...I feel very close to bringing this one back from the dead. |
timothy_nd28 |
Sep 16 2014, 04:32 PM
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#2
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Advanced Member Group: Members Posts: 2,299 Joined: 25-September 07 From: IN Member No.: 8,154 Region Association: Upper MidWest |
Stranded 12 or 14 gauge would be fine, but I think we already established this test yesterday. Your fuel pump is indeed toast, and needs to be replaced. From the fuel pump being locked up, causes an high LRA condition, which could of fatigued the dual relay.
We never went into further testing with the dual relay, but having a new one is a great peace of mind if you plan on driving this car as a DD. I'm not much of a fan for rebuilding your own fuel pump. If not put back together properly, leaking fuel could occur, just not worth the risk IMO. One last step worth performing would be to remove the fuel pump and bench test it by connecting the wires of the fuel pump straight to the battery. |
willimac |
Sep 16 2014, 05:39 PM
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#3
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Newbie Group: Members Posts: 14 Joined: 14-September 14 From: minnesota Member No.: 17,901 Region Association: None |
Stranded 12 or 14 gauge would be fine, but I think we already established this test yesterday. Your fuel pump is indeed toast, and needs to be replaced. From the fuel pump being locked up, causes an high LRA condition, which could of fatigued the dual relay. We never went into further testing with the dual relay, but having a new one is a great peace of mind if you plan on driving this car as a DD. I'm not much of a fan for rebuilding your own fuel pump. If not put back together properly, leaking fuel could occur, just not worth the risk IMO. One last step worth performing would be to remove the fuel pump and bench test it by connecting the wires of the fuel pump straight to the battery. It won't necessarily be a DD, but if I'm going to go to the trouble of taking it apart and re-assembling, I might as well do it right. Every system of the vehicle has been adversely affected by decades of neglect. Any thoughts on a good place to pick up a fuel pump? Pelican is sold out and Auto Atlanta has rebuilt ones for $236. Hoping not to have to spend so much. |
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