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EFV-8 Club Forum / General Ford Discussion / Continuing '36 fuel pump problem!

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Discussion Topic: Continuing '36 fuel pump problem! -- page: 1 2

Flatbob

11-01-2011 @ 3:09 PM

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Received my fuel pump rebuild kit from THEN & NOW less the diaphragm spring (apparently not included with kit) reassembled pump. Pump would not pick up fuel from tank so primed pump with My-T-Vac and engine started immediately. To confirm my repair shut engine off for a few seconds and it restarted again and shut it off, figured I'm good to go now. Ten minutes later restarted it and took it for a test drive; while driving am thinking what a joy this car (272 miles on it) is to drive in spite of having only 15"'s of vacuum and 70-90 lbs. compression and returned home after 15 minutes of driving. Pulled into the garage, shut it down and attempted an immediate restart but failed to start! Checked sediment bowl and bowl was half full; disconnected fuel line at carb. & pump doesn't deliver fuel to container. So.........why does this pump work flawlessly from idle to 55 mph+ yet isn't capable of a restart after car has been driven? I don't want to install electric fuel pump but am wondering if this is the only way to solve problem.

shogun1940

11-01-2011 @ 5:01 PM

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it sounds like something loosened up , at high rpm it pumps enogh fuel, but at idle it will not keep up. try disconnecting the fuel line at the tank and put you vacuum guage on the line , you should see vacuum and it should stay in the line for awile.

37RAGTOPMAN

11-01-2011 @ 5:43 PM

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FLATBOB
try this, use a different tank for fuel supply,
use a line from a another fuel container, with a hose going into the fuel pump intake side,[ make up a another line for testing purposes ] and try running the engine, see what happens,
I use a outboard fuel tank,
if it is better, you have a fuel problem from the firewall back,[maybe the flex line,]
check [ inspect ] the metal fuel line from front to rear,
also when it does not start,check the spark,
I suspect the ign coil might be also a problem, knowing
FLATHEAD FORDS,
run the engine till it gets operating temp,
shut it off, see if it starts, if not use a ice pack on the coil for a few minutes and see if it starts,
hope this helps 37RAGTOPMAN

Flatbob

11-01-2011 @ 6:18 PM

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I really think this is a fuel delivery problem and nothing else. I will run a new line to a different fuel supply source & see what happens. Thanks for the help, Bob.

supereal

11-01-2011 @ 8:13 PM

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It is likely you have a slight air leak somewhere between the tank and the pump. This allows the pump to lose prime and interrupt the ability to draw from the tank. An old ferrule could be the cause, or a spring clamp, if you have an inline filter. Worm gear clamps are the only fix, in that case.

Flatbob

11-01-2011 @ 9:50 PM

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Super, am going to recheck all my connections, now that I think about it; I took pride in the originality of my car & that may be the problem. I have an original '36 pump on it and the fuel line from pump to carb. is also original and the ferrules as you describe may well be the culprit. I will have to bite the bullet and get one of the repo. lines or maybe cut the old ferrules off if I have enough line to run from pump to carb.. Bob

drkbp

11-02-2011 @ 4:54 AM

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Flatbob,

If you are using the sediment bowl type fuel pump, be sure the gasket between the glass bowl and pump housing where it mounts is good. I have one on my '35 because it has the sediment bowl to catch stuff out of the tank. It can suck air in there if you don't have the bowl sealed to the pump. There is a screen in the top too and you don't want it slipped over out of place under the lip of the glass either. Also, be sure there are no cracks in the pot metal fuel pump housing. Just a couple of thoughts as I have followed this thread.

I drove my '35 to the office this morning and I put a squirt of gas in the 97. Started right up. In 12 - 14 days, it leaks enough to need a little prime. Probably for the reasons the other folks have said. Having to prime is not the best but it makes it easy on the starter. I chalk it up to a little air leak somewhere and just drive the rascal.

Ken in Texas

BrianCT

11-02-2011 @ 7:04 AM

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Another possibility is the connection between the sediment bowl and the flex line. Are you sure that the fittings match? It seems to me that there are at least two types of fittings. I had a leak at that point that did just what you describe.

TomO

11-02-2011 @ 8:20 AM

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Bob, the problem is on the vacuum side of the system. The fact that your sediment bowl was half full points to this.

Did you check the vacuum action of the pump before you hooked up the input lines?

Check your connections at the fuel tank, flex line and fuel pump. If they are all secure, try a new flex line.

All fuel pumps have sediment bowls. The glass bowl is used on the later fuel pumps and not on Bob's 36 pump. The sediment bowl on the all metal pumps is on the top of the diaphragm.

Tom

Flatbob

11-02-2011 @ 9:44 AM

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TomO, did vacuum check as you described after I rebuilt the pump and gauge showed no response. Really didn't expect that result and didn't know how to interpret it; I would think no matter how bad the pump is, especially after being rebuilt I would get some indication of vacuum on the gauge. Am going to recheck all connections from tank to carb..

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