Re: intermittant stalling
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Forum Ambassador
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One of several possibilities is that with your electric pump pushing thru the unrebuilt mechanical pump, if the diaphragm in the mechanical pump has failed, the electric pump is pushing some (most?) of the gas directly into the crankcase rather than the carburetor. Pull the mechanical pump and rebuild it or have it rebuilt by someone like Gould or Terrill as a first step. And if this has happened your oil has been very diluted and should be dumped or you will risk real serious engine problems.
One last comment, the needle and seat control valve is the carburetor is designed to function with a maximum pressure of 4.5 to 5 psi so your electric pump could overwhelm it - after you resolve the other issues, install a pressure reducer and only use the electric pump for priming after long storage, or if vapor lock should occur.
Posted on: 2016/6/11 13:46
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Re: intermittant stalling
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Forum Ambassador
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If you get the pump rebuilt the rebuilder will take care of the cleaning but if not, on some pumps the steel bowl on the bottom has a stacked plate arrangement inside that acts like a screen. Other pumps have ordinary screens inside the bowl. If the tank was rusty at some point all those rust particles could be inside blocking flow.
Another thing would be the rubber flex hose between the pump and main fuel line. If that wasn't replaced it could be old and the liner inside could be cracked. With cracked liners the pump could be managing to pull a portion of the liner away from the wall and block fuel flow. If hose is not alcohol resistant it might have swelled and not allow much flow.
Posted on: 2016/6/11 14:39
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Howard
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Re: intermittant stalling
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Home away from home
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Thanks for the quick reply - I should have mentioned that the electric is only a stand-by. It was off when this occurred, but turning it on failed to help start the car.
I will order a rebuild kit and see what the pump looks like inside. It does not appear to have been rebuilt, but so far everything I have gotten into in this car has been surprisingly new/clean. There is no indication of gas in the crankcase, but I'll check next time I am in my garage. Good call on the pressure reducer. I will check the specs on the pump, I don't recall the output pressure.
Posted on: 2016/6/11 16:12
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1941 Touring Sedan
1952 250 Convertible 1932 902 Rumble seat Coupe Who is John Galt? |
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Re: intermittant stalling
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Home away from home
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The small rubber hose has been replaced. It looks like the consensus is going to the pump. I'll let you all know if that fixes it.
Thanks for the helpful insight.
Posted on: 2016/6/11 16:14
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1941 Touring Sedan
1952 250 Convertible 1932 902 Rumble seat Coupe Who is John Galt? |
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Re: intermittant stalling
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Home away from home
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coil? capacitor? vacuum advance? dirt in electric pump filter?
Posted on: 2016/6/11 16:26
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Re: intermittant stalling
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Home away from home
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Good advice from all. There is one more thing you can easily do. Check the gas cap. It should be a vented type. An unvented cap can cause engine stalling.
(o{}o)
Posted on: 2016/6/12 12:49
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We move toward
And make happen What occupies our mind... (W. Scherer) |
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Re: intermittant stalling
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Home away from home
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remove ditributor cap and rotor. Shake the distributor shaft back and forth sideway to see how much slop/wear there is in the bushings.
Posted on: 2016/6/12 15:33
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VAPOR LOCK demystified: See paragraph SEVEN of PMCC documentaion as listed in post #11 of the following thread:f
packardinfo.com/xoops/html/modules/newbb/viewtopic.php?topic_id=7245 |
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