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  #21  
Old February 4th, 2020, 07:28 AM
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If you have gassy oil, the problem is usually a bad fuel pump.
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  #22  
Old February 4th, 2020, 08:59 AM
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Quote:
Originally Posted by kwai View Post
If you have gassy oil, the problem is usually a bad fuel pump.
I'm running an electric pump, mounted on the frame next to the tank-- are you thinking the stock mechanical pump, Kwai?
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  #23  
Old February 4th, 2020, 12:06 PM
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yes. the stock pump. it's the usual way that gasoline gets into the oil.

don't know how an electric pump would create the problem.
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  #24  
Old February 4th, 2020, 12:13 PM
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Quote:
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yes. the stock pump. it's the usual way that gasoline gets into the oil.

don't know how an electric pump would create the problem.


Stuck float is the only thing that comes to mind.


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  #25  
Old February 7th, 2020, 05:41 AM
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The mystery continues!!!

Will be good to hear the result. On another note, if that oil is full of gas (for whatever reason), it would probably be a good idea to change it.

But the two theories above, fuel pump diaphragm, or stuck float "possibly" could have caused the issue.
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  #26  
Old February 7th, 2020, 07:43 AM
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Quote:
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The mystery continues!!!

Will be good to hear the result. On another note, if that oil is full of gas (for whatever reason), it would probably be a good idea to change it.

But the two theories above, fuel pump diaphragm, or stuck float "possibly" could have caused the issue.
I know Don, and mysteries drive me crazy. I was watching an episode of "The Grand Tour" the other night, on which a Maserati Biturbo started to run really badly. As a footnote to the film segment in which it was featured, they mentioned that two experienced Maserati mechanics never could find the reason it ran so badly. That would keep me up at night, make it very difficult to perform other tasks.

I'll have to give that oil a sniff, but it wouldn't surprise me if it was pretty gassy, and not because of the fuel pump (I'm running an electric pump), but because of my use of the choke while trying to get it started. This carb (1920) seems to have a pretty aggressive choke on it, which I most likely overused trying to get it started on a chilly day. Going to add checking float operation to my list, though.

I hope I don't needed to change that oil. though-- it's Amsoil with about 500 miles on it.
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  #27  
Old February 8th, 2020, 04:35 AM
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Quote:
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I know Don, ...

I hope I don't needed to change that oil. though-- it's Amsoil with about 500 miles on it.
Not cheap oil, I know. I have been running Rotella 15W40. Although, I don't put many miles on the truck. Most of the time it is just started and run until warm.

That reminds me, gotta do that this week! Actually, I should drive it and then change the oil.

With respect to the fuel pump, are you totally bypassing the mechanical pump? Meaning electric fuel pump, directly to the carburetor? Also, what fuel pressure do you have on the inlet to the carburetor? Hopefully, not too much that it is pushing the float off of the seat.

Please, let us know.
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  #28  
Old February 8th, 2020, 06:42 AM
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Quote:
Originally Posted by Don Cavey View Post
Not cheap oil, I know. I have been running Rotella 15W40. Although, I don't put many miles on the truck. Most of the time it is just started and run until warm.



That reminds me, gotta do that this week! Actually, I should drive it and then change the oil.



With respect to the fuel pump, are you totally bypassing the mechanical pump? Meaning electric fuel pump, directly to the carburetor? Also, what fuel pressure do you have on the inlet to the carburetor? Hopefully, not too much that it is pushing the float off of the seat.



Please, let us know.


The electric pump goes to a fuel pressure regulator mounted on the inner fender, set to 4 1/2 lbs. Itís always worked well. Iíd get a pic, but Iím in WY right now working on my IH project.
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  #29  
Old February 8th, 2020, 09:47 AM
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That pressure should be fine...and that is a great way to install that system!

Problem is when people put in an electric fuel pump and dont use a 7 psi or less pressure pump and dont include a regulator...then the pressure can blow the needle off the seat and flood the motor.

You should have no worry in that area...thankfully...

Still wondering the cause...your idea about the spark plug wire causing a spark would be odd but not impossible...
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  #30  
Old February 8th, 2020, 02:20 PM
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Quote:
Originally Posted by Nailhead View Post
The electric pump goes to a fuel pressure regulator mounted on the inner fender, set to 4 1/2 lbs. Itís always worked well. Iíd get a pic, but Iím in WY right now working on my IH project.
Understand and agree. No picture necessary. Still, a mystery!
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