Fuel Pump Question

Herrmann_Sherman · Post by **Herrmann_Sherman** » Sat Jun 11, 2011 1:14 pm

...sadly I need a new one. Actually I have a pump from a friend which is not working. Whacked. Today my M38 stopped and the carburetor gets no gas anymore. Petrol line seems free. I don´t want to use a repair kit and will give the pump back to my friend.
So I´m looking on ebay and found some with a glass bowl and some without. But whats the differece? I know the original M38 had a pump with an build-in-airpump (so far so good) but I don´t need it for mine.

The eBay guy which sells pumps says, the pump is working for CJ-3A and CJ-3B...does anybody know: Is the pump working for M38´s too (surely without airpump)...?

Many thanks for helping me

Herrmann_Sherman

Beacher425 · Post by **Beacher425** » Sat Jun 11, 2011 4:45 pm

Here are civy replacement part numbers:
Solid top without vacuum lower half: 17709.02
Glass top without vacuum lower half:: 17709.01
Pump with vacuum lower half: 17709.03

Rapco has the fuel pump spacer.

Post by **wesk** » Sat Jun 11, 2011 9:18 pm

The CJ3A and 3B pumps will work. Single action (No Vac Pump) fuel pumps normally do not use a spacer.

Rotorhead · Post by **Rotorhead** » Thu Jul 28, 2011 2:37 pm

hi, i'm a newbie to this beast. still trying to get my M38 on the road. no fuel to carb and have had fuel pump top off. it appears to be a piston type rather than diaghram. one valve is shot and a spring was broke. can anyone recommend a good source for an overhaul kit? or should i just buy a new one for the time it would take to overhaul? thanks

RICKG · Post by **RICKG** » Thu Jul 28, 2011 3:24 pm

Before you guys go anywhere you should 1st go to
the downloads section and get the TM9-1828A.
It's a GOLDMNE of fuel pump info.

whydahdvr · Post by **whydahdvr** » Fri Jul 29, 2011 3:49 pm

So are there any rebuild kits for fuel pumps? Or does it have to go out to someone (like DeBella, etc.) and be used as a core replacement for a rebuilt one?
Thanks.

ocwd · Post by **ocwd** » Fri Jul 29, 2011 4:02 pm

Make sure that the pump you buy is compatible with your front engine plate. I know from frustrating experience. I tried, by mistake, installing an M38 fuel pump with a CJ3 front engine plate. It doesn't work

whydahdvr · Post by **whydahdvr** » Fri Jul 29, 2011 4:12 pm

Good point. Do you have pictures of what that looks like?

ocwd · Post by **ocwd** » Fri Jul 29, 2011 7:42 pm

http://www.willysmjeeps.com/v2/modules. ... &start=135

Post by **wesk** » Fri Jul 29, 2011 10:08 pm

Then and Now will rebuild your pump, sell you an exchange pump or sell you a kit.
http://www.then-now.com/

whydahdvr · Post by **whydahdvr** » Sat Jul 30, 2011 5:48 am

Thanks Wes. I was thinking of using them, especially as they are "local" here in MA. I saw that a couple of our site members had a bad experience with them. Did that ever get clarified or updated? I'll contact Then and Now to see what the best option is. Also, what about using a civvy fuel pump? I thought I saw in my poking around that there were some that would fit.
Thanks!

Post by **wesk** » Sat Jul 30, 2011 9:24 am

Two folks have had issues with their pumps coming back with replacement housings that did not contain the hand priming lever. Most large volume accessory overhaulers will not guarantee that your parts that don't past muster will be replaced with period correct parts.

Their rebuild kits are good.

Which pump you use depends on what type resto you are doing. Factory class resto needs the period correct military pump. Motor pool resto can use any of the military pumps and a driver resto can use the civvy pumps with consideration to single action pump if you are running electric wipers or the dual action pump from the 54 to 68 CJ3B/CJ5 if they are tunning the vacuum wipers. Both style civvy pumps do not use the spacer. Both will require plumbing modifications. For example the dual action CJ3B/CJ5 pump uses hise barb type fittings.

whydahdvr · Post by **whydahdvr** » Sat Jul 30, 2011 9:52 am

OK. Heard back from Then and Now and getting their rebuild kit to try that. May also get (depending on $$$) the civvy dual-action fuel pump as a back-up. I'll see what NAPA prices it at.

If I run into any problems I can take a trip to Weymouth, about 1 hour away, to drop it off with them.
Thanks.

artificer · Post by **artificer** » Sat Jul 30, 2011 11:04 am

How did you come to the conclusion the pump/ is/are bad?
I don't see where you ever checked whether it is pulling a vacuum or delivering pressure. For what it's worth thats what I would be doing first.