My Willys 3A and 3B Community
3A, 3B, DJ Technical Knowledge Base => "Original"-- Technical Questions, Answers, Observations => Topic started by: Ryan_M on March 05, 2013, 08:35:57 PM
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Can anyone share a pic of the plumbing required for the fuel pump vacuum booster that powers the windshield wiper? One line comes off the vacuum booster to the wiper motor but I'm not sure where the other lines goes. I had the wrong fuel pump and no wiper vacuum lines on my Jeep. I've found good pics of the riggings on the windshield but not under the hood. I am installing a new pump/booster this week.
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The other goes to a port on the intake manifold. That is how the vacuum is generated. I don't a have a picture though.
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Joe Caprio's 3A on the CJ3B Page.
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Hey Ryan.
This was pretty early on. �I do not have the 3A pump and the connections at the pump ended up backwards. �Things have changed a little on mine, but you can at least get some ideas.
That old PCV looks silly.
(http://i1195.photobucket.com/albums/aa397/athawk11/vacuumfuel2.jpg)
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Thanks Tim! Ironically, I was just crawling thru your Photobucket pics trying to see how you rigged yours. Nicely done.
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Oh. That's great. Didn't think anyone looked at that stuff but me. I'm always happy to contribute. Which pump did you get?
Tim
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Tim, is that an original double action pump or a new one?
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Oh. That's great. �Didn't think anyone looked at that stuff but me. �I'm always happy to contribute. �Which pump did you get?
Tim
I got the fuel pump with vacuum booster from Walck's. Not cheap but looked like one the nicer ones out there. No glass bowl though. I like the one I removed but it was leaking fuel pretty bad. Who knows, I may overhaul it and put it back on. No pic of the new one but here's the old one:
(http://i1188.photobucket.com/albums/z403/rmurdock2121/51%20Willys%20Jeep%20CJ3A%20Rehab/DSCN0617.jpg)
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I see on the picture the Uncle Vin posted, it is the metal top. And Ryan, yours had a glass top originally? Cool! My suspicion was correct then in the FAQ I put together about fuel pumps.
http://cj3apage.com/forum-yabb/YaBB.pl?num=1362623364/0#2
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I see on the picture the Uncle Vin posted, it is the metal top. And Ryan, yours had a glass top originally? Cool! My suspicion was correct then in the FAQ I put together about fuel pumps.
http://cj3apage.com/forum-yabb/YaBB.pl?num=1362623364/0#2
I have no idea if my glass bowl pump is original or not. I had posted the question here last year and the general consensus was that it was only used on later models like the 3B and the CJ 5's. Your post the other day raises the question again. I'd like to think it was original but I cannot confirm it. If I can, it'll be going back on the engine after a rebuild.
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I think the glass ones can be found on late '53 3As.
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Tim, is that an original double action pump or a new one?
Nate, Nah. �Not original. �It's a replacement that I think belongs on a 3B or CJ5. �I did enjoy your post on the fuel pumps. �I was always under the assumption that 3As came standard with just the vacuum pumps.
Ryan, That glass top double action is awesome. �Love those glass tops!! [smiley=thumbsup.gif] �I would definately rebuild that baby!!
Tim
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These old fuel pumps are an item with high failure rates. It is extremely unlikely that any running CJ-3A still had the original fuel pump past the 80's. I have never seen any documentation to indicate anything other than part number 647911 being used throughout CJ-3A production. 647911 is an AC series CF fuel and vacuum pump.
(http://www.cj3a.info/tech/fpfig57.jpg)
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I installed the new pump tonight but cannot get fuel to the carb. It sounds like it's working but no fuel pumps through. I tried taking the top cover off the pump and manually adding fuel to try and prime it. Still no luck. What else should I be doing? The previous fuel pump was leaking but aside from that was functioning as it should so I'm pretty sure everything else is good. I had the old pump off a few times and never had any trouble re installing and having it work immediately. What am I missing with this new one?
Do I even have the hoses connected properly?
(http://i1188.photobucket.com/albums/z403/rmurdock2121/51%20Willys%20Jeep%20CJ3A%20Rehab/DSCN1996_zps9aec9f0d.jpg)
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This one works good
(http://www.cj3a.info/temp/fuel%20pump.JPG)
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Thank you, Bob W, for saving the night. I switched the lines to match your pic (and opposite my old pump) and it fired right up. As I've stated before: it is a miracle I've made it this far with my jeep project given some of the incredibly minor league obstacles that have brought the progress to a grinding halt.
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These old fuel pumps are an item with high failure rates. It is extremely unlikely that any running CJ-3A still had the original fuel pump past the 80's. I have never seen any documentation to indicate anything other than part number 647911 being used throughout CJ-3A production. 647911 is an AC series CF fuel and vacuum pump.
(http://www.cj3a.info/tech/fpfig57.jpg)
My '53 was still using the original pump. I changed it out only because I didn't want the vacuum portion. And then I noticed little pieces of rubber in my fuel filter. So I think the diaphragm was starting to give out.
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Here's a photo I took some time ago when I removed the left fender to accommodate some problem I was chasing. �
It shows my dual action fuel pump as well as the routing of my vacuum tubing. �
Sorry to be so late to respond. �I've enjoyed the thread. �
(http://i389.photobucket.com/albums/oo336/calvinhunt/Adjustingthevalves003.jpg)
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I�m working on my CJ3A wiper system.� I have found the �modifications� to it interesting at best.� I am going to reinstall the fuel/vacuum boost pump but the plumbing has been modified beyond repair. Is it possible to purchase the tubing for the vacuum boost pump or is it something I will have to manufacture myself.
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Hi Rob,
I have not seen these 3A vacuum lines reproduced. They were pretty unique to the 3A, so not a very large replacement market for them. Also, if the manifold was ever changed on the 3A, the connection point , thus the vacuum line design could vary. This would make it even more difficult to reproduce on a large scale.
They are not super difficult to make if you have a tube bender and flaring tool. The vacuum lines are inexpensive and carried in multiple lengths at NAPA and other auto parts stores. Ask them for 1/4" brake line.
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Thanks for the input! After search far and wide on the internet I figured I would have to make them myself. I�ll check NAPA out this weekend. I would imagine they will have the bender and flaring tools as well.
Thanks again for the information.
Rob
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pertaining to the flaring tool be sure to ask for a tool that makes the double flare and you will need to have a tube cutter also.
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Will do! Do you know off hand if the vacuum fittings are the same thread as the fuel lines?
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I would say that they would be. I have a '65 cj5 engine that had tubes bent at 90 degrees that you just slipped rubber vacuum hoses onto. Lot'sa different stuff out there.
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Thanks for the information!