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davpet Member
Joined: Jun 29, 2006 Posts: 6
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Posted: Wed Jul 05, 2006 9:08 pm Post subject: Replacing fuel pump....stick w/ willys type w/ glass bowl or |
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go modern. What would be a suitable replacement fuel pump for an L head 134 engine?? My 49 CJ3A must be leaking fuel through the diaphram directly into the oil pan. Will the new pump w/ glass bowl be able to withstand the new fuels w/o destroying the diaphram?? Anyone have a "modern fuel pump" that would still work on the old Go Devil engine??
thanks,
Dave Petrella |
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wesk Site Administrator
Joined: Apr 04, 2005 Posts: 16283 Location: Wisconsin
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Ryan Member
Joined: Jan 10, 2006 Posts: 136 Location: Russellville, AR
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Posted: Thu Jul 06, 2006 11:30 am Post subject: |
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When my original vacum pump failed I went to the local parts store and ordered a pump for the L134. (It is no longer a vacume pump.) Best I could tell I did not have to use the spacer from my old pump. If I held the new one up to the old one with the spacer installed on the old on the arms looked to be the same length. My pump does not have the glass bowl. The engine runs well I hope I havent messed anything up? |
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wesk Site Administrator
Joined: Apr 04, 2005 Posts: 16283 Location: Wisconsin
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Posted: Thu Jul 06, 2006 11:57 am Post subject: |
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The primary purpose of the spacer is to adjust fuel pressure by changing the pump arm's position relative to the cam. If you are using a pump Part No so and so and it is being used on an engine model so and so and it was used with a specific thickness spacer then to keep the fuel pressure where it should be you have to match the parts.
When you take off on a tangent and use a diiferent pump then specified all you need to do is measure the pump's pressure output and if it's not in the ball park adjust with spacers. _________________ 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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Ryan_Miller Site Administrator
Joined: Apr 03, 2005 Posts: 1635 Location: Kansas
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Posted: Thu Jul 06, 2006 6:37 pm Post subject: |
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I have seen people use aftermarket low pressure (high pressure being for fuel injection and not carbs) electric fuel pumps and bypass the older style pump.
Just a suggestion for someone who doesn't want to deal with a fuel pump that has diaphrams that the newer fuels may break down. _________________ Ryan Miller
MVPA # 22010 |
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wesk Site Administrator
Joined: Apr 04, 2005 Posts: 16283 Location: Wisconsin
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davpet Member
Joined: Jun 29, 2006 Posts: 6
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Posted: Thu Jul 06, 2006 8:55 pm Post subject: WesK did all 3A's have the vacuum fuel pump?? |
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Wes,
my CJ3A had no windshield or wipers when I bought it.....would it be possible for the fuel pump if it was the vacuum type, to be plugged to prevent any problems caused by vacuum pressure. (sorry this didn't even sound coherent when I was thinking it.) is there a problem having a vacuum assist fuel pump but nothing to use that vacuum pressure for??
Dave |
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wesk Site Administrator
Joined: Apr 04, 2005 Posts: 16283 Location: Wisconsin
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Cacti_Ken Member
Joined: Apr 20, 2005 Posts: 1021 Location: Silsbee, Texas
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Posted: Fri Oct 14, 2011 11:06 am Post subject: |
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wesk wrote: | The correct Willys # 647911 or AC # 1539353 when used after a modern overhaul is all you need. The correct spacer for this pump is WO# 647669, approx. 1/8" thick. If you elect to sub a different pump you must use the correct thickness spacer for it from it's original installation.
Review Harolds 3A page Fuel Pump Article:
http://www.cj-3a.com/Fuel%20Pumps.htm |
I'm reviving this tread, beacuse I wanted to get a spare pump to use in a tight situation.
I ask NAPA to cross these numbers, but they failed to cross. And there info doesn't go back past the sixties.
Anone have any new numbers that will work? _________________ Tropical Veteran
35th Inf. Reg. "CACTI" 4th I.D. VN
Amateur Radio K5XOM |
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wesk Site Administrator
Joined: Apr 04, 2005 Posts: 16283 Location: Wisconsin
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Posted: Fri Oct 14, 2011 12:10 pm Post subject: |
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The 60's is far enough back. The 1960 thru 1968 CJ3B pump is a dual vac/fuel pump that will work and the only difference is it's plumbing uses nipples for the vacuum instead of threaded fittings.
The 1960 thru 1971 CJ5 with F134 fuel pumps will also work and will just be fuel only.
The 1960 thru 68 DJ2A pump is another candidate.
You need a counter person who can see past the keyboard! _________________ 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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Cacti_Ken Member
Joined: Apr 20, 2005 Posts: 1021 Location: Silsbee, Texas
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Posted: Fri Oct 14, 2011 4:28 pm Post subject: |
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I made a call to Autozone they are more close to me than the others.
Their computer showed for a 67 CJ5 a duel action pump by Airtex_Master #4032
max pressure range 5.5psi...min 4psi.
It has two metal tubes coming out of the vacuum pump. Has upgraded seals and laminated diaphrams to ensure compatibility with modern multi-fuel blends. I think I've seen this model on ebay sometimes. _________________ Tropical Veteran
35th Inf. Reg. "CACTI" 4th I.D. VN
Amateur Radio K5XOM |
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RimfireJim Member
Joined: Feb 28, 2011 Posts: 148 Location: Escondido, CA
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Posted: Fri Oct 14, 2011 5:51 pm Post subject: |
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NAPA on-line shows the same Airtex 4032 listed for the CJ-3B, but it's not actually available from them on-line. "Call store for availability." It looks somewhat like the AC fuel pump an ebayer in Greece has been touting as an M38 pump (but looks different than the pumps I've seen in pictures on this forum), but there are a number of differences. _________________ Jim M.
1952 M38 son-father project
Discovering more worn out parts, one assembly at a time |
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wesk Site Administrator
Joined: Apr 04, 2005 Posts: 16283 Location: Wisconsin
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