This is the place to talk carbs and fuel systems...

jeepdog Junior Member Posts: 3	This is the place to talk carbs and fuel systems... Sept 12, 2018 7:59:24 GMT -5 Quote Select Post Deselect Post Link to Post Member Give Gift Back to Top Post by jeepdog on Sept 12, 2018 7:59:24 GMT -5 Would it be helpful with the rebuild if I picked up a carb manual? I see them listed on ebay although they are for the ys637 which is basically the same carb from what I have read.

rickg Global Moderator Full Professor Posts: 1,957	This is the place to talk carbs and fuel systems... Sept 12, 2018 9:06:37 GMT -5 Quote Select Post Deselect Post Link to Post Member Give Gift Back to Top Post by rickg on Sept 12, 2018 9:06:37 GMT -5 TM 9-1826A is available to download at no charge for members only of this M38 and M38A1 site.. willysmjeeps.com/v2/modules.php?name=Forums
	OD MULE MC51986 DOD 01-52 Big Red 19fiddy 3A salad Ain't nothin like drivin an old jeep across new country.

cline48 KJRT Posts: 460	This is the place to talk carbs and fuel systems... Sept 12, 2018 16:53:07 GMT -5 Quote Select Post Deselect Post Link to Post Member Give Gift Back to Top Post by cline48 on Sept 12, 2018 16:53:07 GMT -5 Summit Racing is giving Ol’ Scout some competition l! Yea Right!!
	I always leave tracks behind me!

Scoutpilot Administrator Posts: 2,727	This is the place to talk carbs and fuel systems... Sept 12, 2018 17:57:37 GMT -5 Quote Select Post Deselect Post Link to Post Member Give Gift Back to Top Post by Scoutpilot on Sept 12, 2018 17:57:37 GMT -5
	Old fashioned service never goes out of style. “The bitterness of poor quality remains long after the sweetness of low price is forgotten.” ― Benjamin Franklin

alphado
Junior Member

Posts: 4

This is the place to talk carbs and fuel systems... Jul 30, 2019 14:19:12 GMT -5

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Post by alphado on Jul 30, 2019 14:19:12 GMT -5

First time this happened to me. 1943 Willys MB with a Carter W0 carb. I have owned it for a few years, it sits most of the time. We get it out maybe once a month. I have been running regular fuel with ethanol in it. It normally runs great.

Out for a drive last night, probably drove it for 20 minutes, no issues. Stopped at a car cruise for about an hour. Went to leave. Started right up, about a mile down the road, it started bucking and surging like it was out of gas. Downshifting it seemed to help keeping the revs up. It would clear up and then come right back. I nursed it to the firehouse that I belong to and started rooting around. No way I could get it to start. Carb was dry inside, so we took it apart and found the bowl had some yellow slime in the bottom. We cleaned what we could and it started right up. Drove it home, about 3 miles and it was pretty rough but seemed to clean itself up as I got closer to home.

My thought is the ethanol fuel is to blame. I was going to drain it and replace it with non ethanol fuel. After looking here, it almost sounds like maybe vapor lock. It was hot, upper 80s and very humid. Engine was running a little over 190 on the temp gauge.

Thoughts?

Last Edit: Jul 30, 2019 15:03:09 GMT -5 by alphado

Scoutpilot
Administrator

Posts: 2,727

This is the place to talk carbs and fuel systems... Jul 30, 2019 14:25:20 GMT -5

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Post by Scoutpilot on Jul 30, 2019 14:25:20 GMT -5

After about ten days of sitting, Ethanol fuel will attract and condense moisture which settles to the bottom of the tank. Enough condensate can build so that you get a slug of water in the line. No further explanation required there. Before your wise decision to switch the straight gasoline I had only one suggestion. Drive more. Or at least start and run it at a moderate idle a few times a week.

Old fashioned service never goes out of style.

“The bitterness of poor quality remains long after the sweetness of low price is forgotten.”

― Benjamin Franklin

alphado
Junior Member

Posts: 4

This is the place to talk carbs and fuel systems... Jul 30, 2019 14:31:24 GMT -5

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Post by alphado on Jul 30, 2019 14:31:24 GMT -5

Thanks! I have a few events this summer, but my plan is to send you the carb in the fall to have a peek at. It could use a once over. I noticed the float pin was worn pretty bad, so other things are probably worn too.

Scoutpilot Administrator Posts: 2,727	This is the place to talk carbs and fuel systems... Jul 30, 2019 14:46:50 GMT -5 Quote Select Post Deselect Post Link to Post Member Give Gift Back to Top Post by Scoutpilot on Jul 30, 2019 14:46:50 GMT -5 I look forward to that encounter. Thank you!
	Old fashioned service never goes out of style. “The bitterness of poor quality remains long after the sweetness of low price is forgotten.” ― Benjamin Franklin

rickg Global Moderator Full Professor Posts: 1,957	This is the place to talk carbs and fuel systems... Jul 30, 2019 14:59:33 GMT -5 Scoutpilot likes this Quote Select Post Deselect Post Link to Post Member Give Gift Back to Top Post by rickg on Jul 30, 2019 14:59:33 GMT -5 Most of our jeeps don't get run often enough to consume a tank of ethanol before it begins to degrade and starts to muck stuff up..
	OD MULE MC51986 DOD 01-52 Big Red 19fiddy 3A salad Ain't nothin like drivin an old jeep across new country.

Scoutpilot Administrator Posts: 2,727	This is the place to talk carbs and fuel systems... Jul 30, 2019 15:10:40 GMT -5 Quote Select Post Deselect Post Link to Post Member Give Gift Back to Top Post by Scoutpilot on Jul 30, 2019 15:10:40 GMT -5 Understood. I switched a few years ago and despite the higher cost for the fuel, never looked back.
	Old fashioned service never goes out of style. “The bitterness of poor quality remains long after the sweetness of low price is forgotten.” ― Benjamin Franklin

rickg Global Moderator Full Professor Posts: 1,957	This is the place to talk carbs and fuel systems... Jul 30, 2019 15:22:05 GMT -5 Scoutpilot likes this Quote Select Post Deselect Post Link to Post Member Give Gift Back to Top Post by rickg on Jul 30, 2019 15:22:05 GMT -5 Yup, for the miles we drive the extra cost is not a factor.
	OD MULE MC51986 DOD 01-52 Big Red 19fiddy 3A salad Ain't nothin like drivin an old jeep across new country.

Scoutpilot Administrator Posts: 2,727	This is the place to talk carbs and fuel systems... Jul 30, 2019 15:59:06 GMT -5 Quote Select Post Deselect Post Link to Post Member Give Gift Back to Top Post by Scoutpilot on Jul 30, 2019 15:59:06 GMT -5 Water does not compress. Imagine the increased wear on the bearings when the motor bucks.
	Old fashioned service never goes out of style. “The bitterness of poor quality remains long after the sweetness of low price is forgotten.” ― Benjamin Franklin

alphado Junior Member Posts: 4	This is the place to talk carbs and fuel systems... Jul 30, 2019 17:26:39 GMT -5 via mobile Quote Select Post Deselect Post Link to Post Member Give Gift Back to Top Post by alphado on Jul 30, 2019 17:26:39 GMT -5 Siphoned the old fuel out, drained the fuel pump bowl. Still running pretty rough with the new fuel. Trying to drive it a bit to see if it clears up.

Deleted
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This is the place to talk carbs and fuel systems... Aug 23, 2019 17:09:01 GMT -5 Scoutpilot likes this

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Post by Deleted on Aug 23, 2019 17:09:01 GMT -5

Jul 30, 2019 17:26:39 GMT -5 alphado said:

Siphoned the old fuel out, drained the fuel pump bowl. Still running pretty rough with the new fuel. Trying to drive it a bit to see if it clears up.

Do yourself a favor and remove the tank from the Jeep and thoroughly clean it, throw in a handful of 1/4” nuts and shake them around to loosen all the crap in the bottom of the tank. Eliminate all possibilities of contamination!.

Lee

alphado Junior Member Posts: 4	This is the place to talk carbs and fuel systems... Sept 3, 2019 7:36:31 GMT -5 Scoutpilot likes this Quote Select Post Deselect Post Link to Post Member Give Gift Back to Top Post by alphado on Sept 3, 2019 7:36:31 GMT -5 Just an update on my Jeep. It ended up just needing points. Purrs like a kitten now.