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pduske Member
Joined: Feb 01, 2006 Posts: 30
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Posted: Wed Jan 08, 2020 3:15 am Post subject: vacuum/gasoline pump - does it leak fuel? How to check? |
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Hello Jeep fellows,
the engine of my M38A1 consumed 4 litres of oil on 400 miles - I will build in an overhauled engine next week.
The guy that sold me overhauled engine recommended to make sure that the pump does not bring fuel in to the oil system of the engine - which would ruin the new engine fast.
question 1: Is that correct / does this sometimes happen with this pump?
question 2: how do I check if the pump does leak fuel?
I appreciate your support
Regards
Philipp _________________ ´57 M38A1
Ramsey 50R setup
USMC spec. PowrLok front & rear
Meyer ST 84 plow |
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wesk Site Administrator
Joined: Apr 04, 2005 Posts: 16250 Location: Wisconsin
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Posted: Wed Jan 08, 2020 11:45 am Post subject: |
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Yes, when the fuel pump diaphragm fails the fuel will leak thru the block opening to the oil. You can smell the gas in the oil instantly on your dipstick. Rebuilding the pumps solves the problem but if you continue to operate the engine on the thinned oil you can damage the engine.
Early fuel pumps of this type had a problem with early diaphragm failure and this was resolved with a Technical Bulletin issue TB 804-11 dated Jul 1954. This bulletin has been complied with long ago in most pumps but you should always check a new pump on installation for previous compliance.
_________________ Wes K
45 MB, 51 M38, 54 M37, 66 M101A1, 60 CJ5, 76 DJ5D, 47Bantam T3-C & 5? M100
Mjeeps photo album: http://www.willysmjeeps.com/v2/modules.php?set_albumName=Wes-Knettle&op=modload&name=gallery&file=index&include=view_album.php |
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pduske Member
Joined: Feb 01, 2006 Posts: 30
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Posted: Wed Jan 08, 2020 3:56 pm Post subject: |
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Thank you Wes,
I "tested" by holding a lighter to the dipstick before and after an engine run - no inflammable reaction...
Is that a "valid" test?
Regards
Philipp _________________ ´57 M38A1
Ramsey 50R setup
USMC spec. PowrLok front & rear
Meyer ST 84 plow |
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wesk Site Administrator
Joined: Apr 04, 2005 Posts: 16250 Location: Wisconsin
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Posted: Wed Jan 08, 2020 10:44 pm Post subject: |
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Yes & No. The flammability of the gas depends on its temperature and the ration of gas fumes to oxygen in the air next to the dip stick. So it is quite possible to have gas in your oil and the fumes to not ignite using your test. Plus you are also introducing the smell of lighter fluid and the open flame which can confuse your nose.
The best test is to simply smell the dip stick. If you aren't sure what smells you should identify take a new sealed bottle of engine oil and open the cap. Wet a finger on one of your hands. Now smell it. That's the smell of engine oil with NO gas in it.
Now open a small container of gasoline and wet on finger on your other hand with it. That's the of raw gasoline.
Now wet the finger on your hand that was wet with engine oil with the gasoline. That is the smell that will alert you to an internal fuel pump leak if you smeel that on your dipstick. _________________ Wes K
45 MB, 51 M38, 54 M37, 66 M101A1, 60 CJ5, 76 DJ5D, 47Bantam T3-C & 5? M100
Mjeeps photo album: http://www.willysmjeeps.com/v2/modules.php?set_albumName=Wes-Knettle&op=modload&name=gallery&file=index&include=view_album.php |
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RonD2 Member
Joined: Oct 02, 2014 Posts: 1909 Location: South Carolina, Dorchester County
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wesk Site Administrator
Joined: Apr 04, 2005 Posts: 16250 Location: Wisconsin
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davem201m38 Member
Joined: Jan 22, 2006 Posts: 429 Location: UK
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Posted: Tue Jan 14, 2020 4:56 pm Post subject: |
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Hum. I have my pump off at the moment, the engine is out for rebuild. The pump has been fine so far but we’re now forced to have ethanol 10% and it may be going to 15%. Is there an ethanol tolerant rebuild kit out there your side of the pond?
Thanks, Dave. _________________ David Wigham |
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4x4M38 Member
Joined: May 30, 2014 Posts: 3447 Location: Texas Hill Country
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