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gas in oil,and oil bath air filter in '57 cj3b; leaking fuel pump
Topic Started: Jan 10 2013, 02:59 PM (1,419 Views)
gentlemanjeep
Member
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dont know what ive done wrong, but after seeing a leak in the fuel pump, i took it off to examine. nothing looked bad so i reinstalled. ( i did notice that the bolts where loose, and i should have just tightened and left it alone!) I took the jeep for test drive and that was a mistake! Barely able to get it home, Heavy blue smoke that killed all the mosqitos within 20 mile radius!
Got jeep parked and there was an oil/gas mixture leaking from oilbath breather leaking on floor. Drained oil and 6 Qts came out! heavy with gas.
Just changed oil and reinstalled fuel pump to make sure I had it seated correctly.Just cranked it and it runs but still blue smoke so I'm scared to test drive! HELP and THANKS!
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jeepcj3b
Member
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Where was the pump leaking? externally?
If gas is getting in the oil then the diaphram must be punctured or cracked.
How old is the pump?
Derek Chesterfield Va.

Trans Vintage CJ3B early tub, late frame, F134, all stock and running.

1981 CJ5 304,T-18,Scout 300 4:1 case, 44 front w/lockrite, 44 rear w/detroit.

1978 SJ
6 other various late models
M-100 Trailer
M-416 Trailer
1952 Ford 8N
1946 2A for parts
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gentlemanjeep
Member
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Thanks for answering! It is the original pump and the vacuum hose had been shut off with a screw in the hose ( side note). thought there might have been minut crack in body so iI used JB weld there. No visible leaks.
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jeepcj3b
Member
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I would say you need to rebuild the pump or replace it.
The pumps are readly available and not very expensive. You can get the larger vacuum style again, but if you're not planning on running vacuum wipers you can get the standard pump.

I chose to replace mine when I put the motor back in service. I got it at a local Autozone for less than $40.00. I beleive the vacuum style is around $75.00.

Derek Chesterfield Va.

Trans Vintage CJ3B early tub, late frame, F134, all stock and running.

1981 CJ5 304,T-18,Scout 300 4:1 case, 44 front w/lockrite, 44 rear w/detroit.

1978 SJ
6 other various late models
M-100 Trailer
M-416 Trailer
1952 Ford 8N
1946 2A for parts
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Rus Curtis
Member
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gentlemanjeep,
I'm glad you're scared! You've got a serious issue that needs to be fixed before you drive it again.

Derek has identified the most probable cause. That diaphragm is internal and can't be accessed from outside the pump. I can imagine gas could come out of the vacuum side of the pump if the diaphragm is bad. It needs to be rebuilt.

You may even have trash in your fuel from the deteriorated diaphragm.

A failed pump would definitely explain gas in your oil. Treat it carefully as the fumes are flammable.

I'm not real sure why you'd have oil/gas leaking out of your breather unless your problem was so bad it back flowed through your ventilation tubes - but I would find this hard to believe as other failures could have occurred first.

Fix the pump problem first and the breather may fix itself or at least you could then troubleshoot that.

I used Then And Now to rebuild mine. The job was $95 a few years back (included the $45 diaphragm).

http://www.maritimedragracing.com/then_and..._automotive.htm
Rus Curtis
Alabama
'54 CJ-3B "Green Gruntt"
Bantam T3-C
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gentlemanjeep
Member
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WOW! Thanks guys!! Have ordered new pump, glad I didn't drive again. Hope I didn't do too much damage.
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Rus Curtis
Member
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gentlemanjeep,
If you changed oil and ran with the bad pump again, then unfortunately, you may have gas in the oil.....again.

If so, you'll want to change that out. I'd wait to refill until after replacing the pump.

Keep us informed on how it goes!

Rus Curtis
Alabama
'54 CJ-3B "Green Gruntt"
Bantam T3-C
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gentlemanjeep
Member
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will get pump tomorrow. AND wii chane oil...again! will let yall know how it goes...or blows!!!
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oldtime
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gentlemanjeep, Welcome to the CJ-3B Bulletin Board !

Quote:
 
Got jeep parked and there was an oil/gas mixture leaking from oilbath breather leaking on floor. Drained oil and 6 Qts came out! heavy with gas.

This indicates bad fuel pump plus an inoperative PVC system.
Post pics of your PCV system if possible.
Currently building my final F-134 powered 3B .
Rock Crawler using factory parts from the Willys Motors era (1953-1963)

http://s4.zetaboards.com/CJ3B_Bulletin_Board/topic/30228766/1/#new
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gentlemanjeep
Member
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morning! got new fuel pump yesterday ( w/o ) vacuum. How can I make something as simple as this install SO hard! Anyway it is on! What to do with vacuum line that went into old pump?
Big thankyou for advice on draining oil again even though it only ran for 3 minutes.
Gas found in new oil! Just about to put new oil in but still see dripping of gas/oil into pan. about a drip every 20 seconds, hope its just still draining!
Will check PVC also. Wish me luck... and will let yall know!
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Rus Curtis
Member
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gentlemanjeep,
If you are describing the drip from the oil pan drain hole, then at that rate the oil pan is very empty and good to go. Any residual (and I do mean residual) fuel will not be a factor.

The original pump had 2 lines of vacuum. Remember this was a vacuum assist to work in conjunction with the engine's vacuum. One line ran to the wiper. The other line connected to the PCV system via a "T" fitting where the plumbing from the PCV valve was connected. This line then went across the front of the engine and terminated at the vacuum inlet below the carb.

You could simply plug the line going to the "T" fitting and be done with it. I honestly don't know if the wipers would work if they were connected directly to the line going into the "T" fitting.
Rus Curtis
Alabama
'54 CJ-3B "Green Gruntt"
Bantam T3-C
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gentlemanjeep
Member
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I see the T fitting and will plug. fixing to go back o/s and crank. also, the old type PVC valve was clean. Haven't checked the line where it originates for fear that i'll twist it off also.... haha! Here i go and will let yall know!!
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gentlemanjeep
Member
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Thanks everyone, the jeep cranks and no gas/oil leaks OR blue smoke! Only thing- it will not idle. It idled well with old fuel pump. I'm gonna leave it for now cause i'm a little frustrated! might reset idle screw or something.
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Rus Curtis
Member
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gentlemanjeep,
One thing to ensure you check is verify that vacuum line going into the "T" from the fuel pump is blocked. A lack of vacuum control can affect idle. If its still open try plugging with your finger to see if idle improves.

A simple plug we'd use sometimes is leave the rubber line on and screw a small bolt or screw into the open end to plug.

Earlier I mentioned debris. You could also look into the carb bowl to see if you see any sediment. Depending on how the diaphragm failed (general deterioration vs. a clean tear) it could have generated small particles that would have been small enough to get to the carb but could still plug your idle ports.
Rus Curtis
Alabama
'54 CJ-3B "Green Gruntt"
Bantam T3-C
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gentlemanjeep
Member
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Update. After adjusting timing, the jeep runs well!
Thanks to all! Now to figure along with many other issues, fixing lights. Fog lights work but no headlights. Foot switch change to start with?
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