Question for my fuel pump M-38

elias929 · Post by **elias929** » Thu Sep 19, 2013 9:18 am

Hi
I have a fitting brass and oil seems to leak and I want to know if it's missing a hose or I put a plug.

Here this fitting

https://lh6.googleusercontent.com/-p9DI ... 59.jpg[url]

https://lh6.googleusercontent.com/-offa ... 47.jpg[url]

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Post by **wesk** » Thu Sep 19, 2013 9:21 am

The lower half of your pump is the vacuum booster pump and oil at that fitting indicates the diaphragm has failed and you are sucking oil from the engine crankcase.

elias929 · Post by **elias929** » Thu Sep 19, 2013 9:38 am

Thus for to settle the problem it must be replaced!

For the fitting it is normal she is not connected on a hose!

Is it dangerous for the engine if I drive a little before change the part!

I appreciate your help!!

Thanks Wes......

Post by **wesk** » Thu Sep 19, 2013 10:13 am

Thus for to settle the problem it must be replaced!

Replace or rebuild the pump.

For the fitting it is normal she is not connected on a hose!

There are two fittings at the bottom of pump. One goes to the intake manifold and the other to the vacuum windshield wipers.

Is it dangerous for the engine if I drive a little before change the part!

You could plug it like the one to it's left but I would be concerned if the lower vacuum diaphragm is deteriorated then most likely the upper fuel diaphragm is also deteriorated. If that diaphragm fails then you will start getting fuel in your crankcase oil. I would , at this point, be safe and replace or rebuild the pump and plumb the vacuum lines correctly.

elias929 · Post by **elias929** » Thu Sep 19, 2013 10:35 am

I read the link on the site

http://www.willysmjeeps.com/v2/modules. ... pic&t=2657

The best place for buy the repair kit or the rebuilt pump, it is Midwest for the parts!!

Post by **wesk** » Thu Sep 19, 2013 10:44 am

Midwest is very honest and fair with their business. He does offer rebuilt exchange pumps. If you do not wish to rebuild your pump then buy an exchange from him.

elias929 · Post by **elias929** » Thu Sep 19, 2013 10:59 am

I call at midwest and he is very friendly. it is only the upper kit of disponibility or the rebuilt fuel pump. The pump is not expensive but i think rebuilt my fuel pump with the kit at (Then and Now Automotive)

http://www.maritimedragracing.com/antiq ... cellar.htm

I like to know and understand how does it work......

Thanks Wes!

You are the reference....

elias929 · Post by **elias929** » Thu Sep 19, 2013 11:44 am

Is it normal the fitting with rubber hose to metal are going at the transmissioN

https://lh4.googleusercontent.com/-llks ... 065836.jpg

Post by **wesk** » Thu Sep 19, 2013 12:07 pm

That port is plugged in my photo. It is for the fording system and carries crankcase pressures when fording valves are closed to the bell housing and transmission to keep water out. On M38's with the fording system basic plumbing installed it is a solid steel tube from that port to the bell housing. Later M38s have that port vented with the same type vent fitting used in the differentials.

This is the later units without the fording vent system installed.

G740 · Post by **G740** » Fri Sep 20, 2013 5:50 am

Hi guys,
The oil in the bottom of the pump does not mean the diaphragm is bad. There is one seal that keeps the oil in the upper part of the pump. It seals around the vacuum diaphragm pull stem. This seal is the problem. I would love to see a Then and Now kit. These pump parts have not been made in a long time and I wonder how they are offering a comprehensive kit and what is included. Anyone have a picture of their kit?
John

elias929 · Post by **elias929** » Fri Sep 20, 2013 6:24 am

I must take the number of the pump before ordering. when i receive this kit i take the picture for you.

RICKG · Post by **RICKG** » Fri Sep 20, 2013 7:28 am

Be advised there are 2 different diaphragm & pull rod types.
Research it and communicate with your supplier (I highly recommend
then and now) before ordering the kit.

elias929 · Post by **elias929** » Sat Sep 21, 2013 8:10 am

Thanks!!!!

I did not remove my pump but i have the number. (4069) I will order next week....

Question for my fuel pump M-38

Question for my fuel pump M-38

Pump and oil