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Old 04-29-2019, 05:45 PM   #1
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Pressure testing fuel system ?

I am upgrading my fuel delivery system and want to verify that there are no leaks anywhere. Specifically I am adding a distribution manifold, replacing a fuel priming pump and the aged hoses that are easily accessed.

Any ideas ? I guess I could get a small hand pump and soap up the connections looking for bubbles ? What PSIG ?
I have Ford Lehmans with 3/8" fuel lines.

Tom and Cheryl
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Old 04-29-2019, 11:52 PM   #2
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If you can valve off the engine itself and the fuel tank(s), then Id pump it up to 10-20 psi and check for leaks. Modern tanks are tested to only a couple PSI, so definitely dont pressurize it. Re the engine, I have no idea what pressure it could take, so safest to valve it off.

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Old 04-30-2019, 12:41 AM   #3
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Sometimes it's easier to find small leaks with air pressure. Since the lines and manifold will be new and empty, I'd put a gauge and air fitting on the system and pump it up to 10 pounds or so and see if it holds for a few hours.
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Old 04-30-2019, 06:54 AM   #4
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A outboard style fuel bulb will make enough pressure to find a leak.

A strip pf paper towel in each fitting and an overnight will show even a tiny leak.
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Old 04-30-2019, 08:57 AM   #5
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All good advice, just make sure you don't pump the tanks up beyond 3psi and usually 2psi is enough for checking for tank leaks.

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