Ethanol gas & 1941 ford v/8

[Randall Hornback]

I have a question on my 1941 Ford that i have had for about 10 years. It has been running fine and well, but now it sounds like it not missing but thumping or cutting out It is a flat-head v/8, i have been running it on low grade Ethanol when it started doing this, then went to high grade but made no change on the running part. It seems to have a lot of carbon on plugs and at high idle it puts carbon out tail pipe. Does and body have any ideas on this, would appreciate very much, I have also put Marvel Mystery Oil in gas tank did not seem to help.

Randall Hornback

[41ford1]

If you are running a Holley 94 type carb you will want to check the power valve. The ethanol causes the diaphragm to leak on older ones. The results are like what you describe.

[JSeery]

The grade of the gas is not going to make a difference, the compression is way to low for that to be a factor. Ethanol is a more likely culprit. Can you purchase non-ethanol gas in your area? You can in Kansas.

[Randall Hornback]

Hello JSeery,yes i can purchase non Ethanol gas here in my area. I put non Ethanol gas in tank filled it up for a number of times but failed to make a change in the running of the car. Do appreciate your reply Thanks a lot.

Randall

[Randall Hornback]

Hi 41 ford, i am going to check out the power valve and see if it has trouble in it thanks for reply.
Randall

[JSeery]

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Originally Posted by Randall Hornback

Hello JSeery,yes i can purchase non Ethanol gas here in my area. I put non Ethanol gas in tank filled it up for a number of times but failed to make a change in the running of the car. Do appreciate your reply Thanks a lot.

Randall

Not sure I understand your response, non-ethanol is not going to repair the damage that the ethanol has caused, it is to prevent the problem in the first place. The only fix now is to repair/replace the damaged parts. Once ethanol has done it's damage nothing you can add to the tank is going to fix it, sorry to be the barer of bad new!

[Randall Hornback]

HI AGAIN JSEERY, I understand the information you informed me with. I sometimes dont explain myself well.I know that if there is parts that need to be replace to fix car to make it run better parts will have to be replace. I give you a big thank you for the information you replyed to me.I am going deeper to find trouble.

Randall

[Randall Hornback]

Hello to all that gave me help and information on my 41 Ford V/8 that was not running right. I want to thank you all for the help, you gave me information if i had a 94 Ford carburetor to change the power valve. I had another carburetor so i replace the one on car with this one, and found it runs alot better without the thumping , or missing out trouble. When i do give it a fast feed from the gas pedal it has a slight hesitating then pick up with no trouble. Maybe i have a Accelerator Pump draging a little. For right now it is running much better and i give you all who help a BIG thank you and i do appreciate .

Randall

[FL&WVMIKE]

DAYTONA PARTS CO. has all the ethanol proof parts for the flathead Ford.
Google them for your ordering information.
MIKE (mikeburch)

[Randall Hornback]

Thanks Mike for where to get Ethanol Proof parts for the flathead Ford.

Randall