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EFV-8 Club Forum / General Ford Discussion / Air bubbles in fuel line

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Discussion Topic: Air bubbles in fuel line

ole_Bill

07-17-2011 @ 3:43 PM

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Engine is newly rebuilt and has about 2 hours run time in the garage but has not been driven on the street. It is a 59A in a '36 sedan, electric fuel pump with fuel pressure regulator set at 2 1/2 pounds. It has semi-transparent fuel lines from the regulator to the carbs via banjo fittings. I just noticed today that I can see small air bubbles leaving the regulator and traveling thru the lines to both carbs (a single line, not using a fuel block). I can see no evidence of a fuel leak anywhere and the bubbles don't seem to effect the way the engine idles or revs. What is going on here?

ford38v8

07-17-2011 @ 4:02 PM

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Bill, you won't see fuel leaks, as the leak is sucking air, not blowing out gas. I don't know what you mean by "banjo fittings", but you should be using the screw-worm type clamps. Regulators and filters generally come with spring type clamps which are totally worthless.

Check these connections first, and you'll likely have no more bubbles. A less likely cause would be a pin hole in the steel/copper line from tank to firewall, or the pickup inside the tank.

Alan

supereal

07-17-2011 @ 4:08 PM

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Banjo fittings are notorious for permitting air leaks. As Alan pointed out, it is a case of a small air leak. It almost certainly has to be between the fuel pump and the carb, as if it were before the pump, it would lose prime and the engine would not run smoothly. The bubbles are not affecting the fuel in the bowl as long as the fuel delivery is sufficient enough to provide an adequate amount.

ford38v8

07-17-2011 @ 5:24 PM

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Bob, I respectively disagree. A leak after the pump would not suck air, as it would have the 2 1/2 lb positive pressure the regulator allows. A negative pressure (before the pump) is required to produce bubbles in the line.

Alan

ole_Bill

07-17-2011 @ 5:47 PM

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Alan - Banjo fittings are simply the part that screws into the carb and allows you to use one fuel line instead of two (as with a fuel block) when running duel carbs. All my fuel fittings have worm-screw clamps on them, except for the metal lines which are compression fittings. I agree that it is sucking air somewhere so tomorrow I'm going back and retightening everything in the system. I'll report back afterwards.

supereal

07-17-2011 @ 8:38 PM

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Alan: I've seen it happen as any slight leak will "aspirate" air. We had a GMC diesel that did just that recently. While a gas engine can tolerate it if slight, not so with a diesel because the injection pump quits. Most banjo connectors have a metallic seal that usually can't be reused successfully.

weldon216

07-18-2011 @ 5:40 AM

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I assume the electric pump is up front, pulling instead of pushing the fuel. If this the case it can pull in air.
Check the fuel line hump over the rear end for a pin hole on the very top of the line. I bought a 36 coupe for 3500 less than the asking price that had this same problem.

ole_Bill

07-18-2011 @ 10:06 AM

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Fuel pump is on the left (driver's) side, directly over the rear axle. After running the engine for another half hour (parked) the bubbles have disappeared.

This message was edited by ole_Bill on 7-19-11 @ 8:53 AM

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