Fuel pump

Mjfire1949 · Post by **Mjfire1949** » Sun Jul 13, 2014 12:02 pm

I just replaced the original dual action fuel pump on my '52 M38 with a single stage pump. I will get the original rebuilt. The new pump is not pulling fuel from the tank. I suspect I have missaligned the cam lobe. Is there any other reason for this problem?

wilfreeman · Post by **wilfreeman** » Sun Jul 13, 2014 12:43 pm

Did you try pressurizing the tank (real low pressure) until you get fuel at the pump inlet? I had to do this when I replaced my entire fuel system (tank to carb).

Mjfire1949 · Post by **Mjfire1949** » Sun Jul 13, 2014 4:43 pm

I haven't tried that, but will try it on Tuesday. Dr. appointment on Monday.

Post by **wesk** » Sun Jul 13, 2014 9:22 pm

Real low means no more than 2 PSI.

RICKG · Post by **RICKG** » Mon Jul 14, 2014 7:12 am

Just in case-You're not using the 1/2" spacer with the civvy pump, right??

Mjfire1949 · Post by **Mjfire1949** » Mon Jul 14, 2014 3:02 pm

Yes, I am using the spacer. That was reccomended by Willys Military Jeeps. Is he wrong?

RICKG · Post by **RICKG** » Mon Jul 14, 2014 3:24 pm

Mjfire1949 wrote:Yes, I am using the spacer. That was reccomended by Willys Military Jeeps. Is he wrong?

To my knowledge ONLY the mil fuel/vac dbl pump uses the spacer.
No spacer with the civvy pump. I think you'll find you're not
pumping because the spacer is not allowing the pump to engage
the cam lobe.
See this from the last reply of your earlier post, what "oilleaker"
said was NO spacer @ civvy pump..

http://willysmjeeps.com/v2/modules.php? ... ght=spacer

Post by **wesk** » Mon Jul 14, 2014 9:12 pm

Rick is correct.

Mjfire1949 · Post by **Mjfire1949** » Tue Jul 15, 2014 5:40 am

Thanks fellows. The guy who sold it to me from Kaiser Willys Jeeps told me to use it. Makes since that the spacer is causing the pump not to engage the cam lobe. Thanks again.

Post by **wesk** » Tue Jul 15, 2014 7:23 am

When the jeep fires up and runs fine be sure to call the guy that told you that and let him know so hopefully he won't share bad info with anyone else.

Mjfire1949 · Post by **Mjfire1949** » Tue Jul 15, 2014 10:43 am

Yes, I plan to do that. Just finished installing it without the spacer. It wasn't making any contact with the cam. I've bought a lot of parts from them, so I plan to let them. That information is published on their web site as an answer to a question about whether to use the spacer or not. Thanks for your help.