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EFV-8 Club Forum / General Ford Discussion / .51 8BA stalling occasionally

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Discussion Topic: .51 8BA stalling occasionally -- page: 1 2

wlobb

11-28-2025 @ 8:12 AM

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Hi, this is a slightly annoying not a big deal but it’s baffling me.

My 1951 8BA usually starts instantly, especially when it’s cold. I turn the key, and the engine is running. I usually use my electronic fuel pump to prime the line, especially it was sitting for about a week, so I let that pump run for 15 or 20 seconds. I turn off the primer hit the key engine starts car runs great.

Once in a while and it’s becoming more frequent it’ll idle for 30 seconds or so and then just die. Sometimes I can make it recover by giving it some gas sometimes giving it gas just makes it stall anyway. The thing is once it gets running it runs absolutely fine on the mechanical pump. It can do 60 miles an hour all day, it can climb hills it can idle just fine. It’s just occasionally it just stalls and I can’t figure out why.

Unfortunately, the carburetor is Chinese knock off that I actually thought was an original. I bought from some guys in Florida, but to be honest with you it’s a very good carburetor. I’ve had no problems with it. I have a 1949 model 94 that I’m in the process of rebuilding that I’m going to put on there but the only reason I’m replacing it is I want a vintage carburetor on the engine not the Chinese knock off.

I’ve occasionally had problems where the copper fittings backed off a little bit, and I tighten them and my problems go away but now the fittings are all tight, I don’t have old fuel in the tank. I usually run it down and fill it up about once a month. I only run non-ethanol.

I’m just baffled. Once I get it started the second time it runs, and it runs fine on the mechanical pump. It runs fine on the electrical pump. I’ve got a pressure regulator on the line. It's set at 2 1/2 psi. Air cleaner is clean… timing is good, points and condenser are new... 6-volt positive ground system is tight and clean...

I’m running out of ideas.

This message was edited by wlobb on 11-28-25 @ 8:14 AM

pauls39coupe

11-28-2025 @ 8:42 AM

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Try using the choke when you start, then pushing it to 1/2 choke till the engine warms a bit.
We (myself included) have gotten so used to fuel injected engines and before that automatic chokes that we forget how these old cars operate. I suspect many of our starting problems such as excess cranking could be solved by using the choke when starting a cold engine.
Give it a try. It worked for me.
Paul

wlobb

11-28-2025 @ 9:21 AM

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Hi, thank you for the reply. I do use the choke when it's cold. You are right, it takes some getting used to after being spoiled by fuel injection. I think the choke may be part of this problem.

pauls39coupe

11-28-2025 @ 10:22 AM

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Give it a try and let us know if it helped.

carcrazy

11-28-2025 @ 1:37 PM

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Check all of the connections in the primary circuit of your ignition system. You may have a loose connection that is marginal and opens up when the engine rocks around on its mounts or experiences various temperatures.

wlobb

11-28-2025 @ 5:58 PM

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I will. Thank you

wlobb

11-28-2025 @ 5:58 PM

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Worth a shot. Thank you

wlobb

11-29-2025 @ 3:42 AM

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The engine will run with the battery disconnected. It’s still 6v positive ground. So, I don’t think that’s part of it.

carcrazy

11-29-2025 @ 4:19 PM

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If the engine runs with the battery disconnected, the ignition system is being powered by electrical current from the generator.

wlobb

11-30-2025 @ 6:10 AM

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Yes dynamos (generators) have a residual magnetic field that allows them to provide enough power for the coil, but not much else. Alternators need to battery power to induce the initial power.

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