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. |
willimac |
Sep 20 2014, 06:51 PM
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#2
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Newbie Group: Members Posts: 14 Joined: 14-September 14 From: minnesota Member No.: 17,901 Region Association: None |
UPDATE: Original fuel pump is relocated to front, beneath fuel tank, behind access panel under front suspension. hasn't been bolted in place yet as I'm waiting for the rubber mounts. New (used) fuel pump here as back up. New relay switch installed. Fuel pump runs when jumping black/red wire at relay to battery + post. Pump ran for some time, expelling air bubbles into fuel tank, generating enough pressure to create a spray (atomized) leak at the supply side of the cold start valve, which was corrected by tightening the clamp. Engine cranks but still not starting, battery has run down with all the exercise - on charger now. fingers crossed. Thanks for all the help! I'm sure there'll be more troubleshooting to come.
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