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Leaking Carb Issues |
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47-old-red 
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Joined: 05 Nov. 2019 Location: PNW USA Status: Offline Points: 84 |
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 Topic: Leaking Carb IssuesPosted: 05 Nov. 2019 at 9:28pm |
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Hi all!
I have a stock cj2a. mechanical fuel pump and all it came with the carter WO carb it started leaking out of the throttle/butterfly shaft so i bought a SOLEX stock rebilt carb from SUMMIT.... it also leaks out of the main throttle shaft!! so... is this a common issue? it almost seems like the carb needs a heat shield, because the get hot, and the gas leaks out under pressure......... puzzling summit is sending me another carb right now to try. thoughts or suggestions? thanks!
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RICKG
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Joined: 08 Jan. 2015 Location: so idaho Status: Offline Points: 1941 |
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Posted: 05 Nov. 2019 at 9:34pm |
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You are using the insulated base gasket right?
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I never met a mule I didn't like!
MC51986 "OD MULE" DOD 01-52 '50 CJ3A "Bucksnort". Keep 'em Rollin' |
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Bruce W
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Joined: 29 July 2005 Location: Northeast Colorado Status: Offline Points: 9651 |
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Posted: 05 Nov. 2019 at 11:36pm |
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The WO probably had a needle/seat issue, dirt in it, worn, etc and was flooding. The Solex, which can’t handle the fuel pressure provided by the stock pump, is also flooding. BW
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It is NOT a Jeep Willys! It is a Willys jeep.
Happy Trails! Good-bye, Good Luck, and May the Good Lord Take a Likin' to You! We Have Miles to Jeep, Before We Sleep. |
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ndnchf
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Posted: 06 Nov. 2019 at 12:40am |
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Send the WO to Scoutpilot or Joe Jennings for a complete rebuild. You'll be amazed at how well it will runs after that. Make a Christmas decoration out of the solex
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1948 CJ2A - It goes nowhere fast, but anywhere slow.
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47-old-red
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Posted: 06 Nov. 2019 at 1:34am |
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i dont have an insulated base gasket the one that was on there is too thick for the solex how can the stock fuel pump be putting out too much pressure? thats crazy it starts great, runs great, drives great.... but when i park it, it starts burbeling out gas as if its suddenly over pressured. even though its off..... have any of you had this issue before?
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Stev
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Posted: 06 Nov. 2019 at 1:47am |
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Check the pressure coming from the fuel pump. There are shims that can be put between the pump and the block to reduce the pressure from the pump. I understand that the Cj2a did not come with shims between the block and the pump from the factory. But I have removed pumps from engines with shims so perhaps it is something to check perhaps, some pumps have different lever arms.
Edited by Stev - 06 Nov. 2019 at 1:50am |
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Stev
1946 CJ2A Trail Jeep (The Saint), 1948 CJ2A Lefty Restored |
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oldscot3
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Joined: 22 Oct. 2019 Location: texas Status: Offline Points: 545 |
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Posted: 06 Nov. 2019 at 1:59am |
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quote:Send the WO to Scoutpilot or Joe Jennings for a complete rebuild.
More info please on these guys, I have a spare WO that I'd like to get rebuilt.
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Bruce W
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Posted: 06 Nov. 2019 at 2:35am |
"That's crazy" OK, fine, don't take my word for it. You've been here 4 hours and 55 minutes, I've only been here 14 years. I Don't know nothin'. Figure it out yourself. It's "burbeling out" gas because it IS over pressured. "have any of you had this issue before?" Yes, we have, many of us, and I speak from experience. BW
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It is NOT a Jeep Willys! It is a Willys jeep.
Happy Trails! Good-bye, Good Luck, and May the Good Lord Take a Likin' to You! We Have Miles to Jeep, Before We Sleep. |
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Bruce W
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Posted: 06 Nov. 2019 at 2:40am |
The shim between the pump and the block does NOT reduce pressure from the pump. Pressure is controlled by the diaphragm return spring, which actually does the pumping. The shim or spacer will only reduce the pump's volume. BW
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It is NOT a Jeep Willys! It is a Willys jeep.
Happy Trails! Good-bye, Good Luck, and May the Good Lord Take a Likin' to You! We Have Miles to Jeep, Before We Sleep. |
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47-old-red
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Posted: 06 Nov. 2019 at 2:58am |
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ok cool thanks looks like its a common issue that the fuel pump is overkill for this little motor lol its just crazy to me that that is common.... youd think theyd check that before it leaves the factory how did you solve it? can you suggest a fuel pressure regulator i should get? or something ? im thinking........ https://www.summitracing.com/parts/sum-g3033b/overview/ Edited by 47-old-red - 06 Nov. 2019 at 3:18am |
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Michaeltru
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Posted: 06 Nov. 2019 at 3:31am |
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Don’t understand why you say it’s a “common issue” the fuel pump is overkill for the engine. Quite a few of those engines have been runnin fine with stock fuel pumps and carbs for decades. You changed the carb and didn’t use the original insulated gasket? Not sure what original carb problem was. Probably age—afloat needle not seating etc. When fuel gets hot like after you turn off the engine, the fuel expands and has to go somewhere. And like I said— the factory did a pretty good job of figuring out fuel pump pressure etc as hundred of thousands of those little engines have run well for decades
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Mike in AZ
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gmcjr
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Posted: 06 Nov. 2019 at 3:43am |
Ok.... If I can “correctly” recall....(I don’t have the books in front of me at the moment.) The stock design mechanical fuel pump in good operating condition, produces around 2 to 3 pounds of fuel pressure, which is acceptable and within the operational limits of the Carter WO. Due to differences of design, the Solex doesn’t like higher fuel pressure than 1/2 to 1 psi. You can use a fuel pressure regulator to help with that issue. Some Solex carb will run just fine without one, some won’t. Like most here, I’ve been down the Solex road before, will they work? Will your Jeep run? Yes, but in my experience, having your wo rebuilt will net you better results without having to re-engineer other stuff to enable the Solex to operate as intended. Your and others mileage may vary. Edited by gmcjr - 06 Nov. 2019 at 3:46am |
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Gary
51 CJ-3A |
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gmcjr
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Posted: 06 Nov. 2019 at 3:47am |
Google oldjeepcarbs Not trying to be a jerk, but I can’t post info here...
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Gary
51 CJ-3A |
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Ol' Unreliable
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Posted: 06 Nov. 2019 at 4:16am |
I put a Solex on Ol' Unreliable when it was still reliable in 2000 and that carb worked just fine (better than the WO, in fact) for at least 9 years without a pressure regulator. Then suddenly, it didn't. I still have no idea what the cause is.
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There's a reason it's called Ol' Unreliable
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ndnchf
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Posted: 06 Nov. 2019 at 12:55pm |
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1948 CJ2A - It goes nowhere fast, but anywhere slow.
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russnj
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Posted: 06 Nov. 2019 at 1:40pm |
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Post some pictures of your setup.
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 43 MB, 48 CJ2A, 50 CJ3A, 55 M38A1, 56 CJ5, 79 M151A2, M100 ,65 M416 |
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47 deuce alpha
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Posted: 06 Nov. 2019 at 2:54pm |
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Sending your carb to Scout Pilot for rebuild is probably the surest cure. He'll rebuid it and actually test run it on a Willys before sending it back. That said, before sending it I would take it apart as Bruce said and check the needle and seat, float, spray carb cleaner thru the jets. Be sure all of the gaskets are good. (it ain't rocket surgery) Trash in the carb is a very common problem on these old vehicles. It probably don't have anything to do with the fuel pump since the jeep was running alright. Be sure you have good inline fuel filters, I run one before the fuel pump. I tried the solex, I could never get it to smooth out and run right, even with an $80 redline regulator.
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1947 CJ2A 90419
1947 CJ2A 127735 1949 Ford 8N 1955 Kaiser Willys Pickup Half the distance takes you twice as long. |
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47 deuce alpha
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Posted: 06 Nov. 2019 at 3:00pm |
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Just before the CFCT I changed my fuel filters. The jeep was running fine but pictured is what came out of the filter before the fuel pump. The filter just before the carb was completely clean.
 
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1947 CJ2A 90419
1947 CJ2A 127735 1949 Ford 8N 1955 Kaiser Willys Pickup Half the distance takes you twice as long. |
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47-old-red wrote: