Fuel Pump

gamillerman · Posted: Mon Oct 30, 2006 5:54 pm Post subject: Fuel Pump

How do you figure out which fuel pump you have. The G740 lists 4 different numbers for an M38 fuel pump. they are seperated by engine serial number and with or without gasket. (different AC part number when the gasket is included with the pump) I emailed Then and Now all the numbers I can find on the pump plus 3 photographs and they said they could not crossmatch any of the numbers I sent them. But then again they also stated that the pump did not appear to have a vacume assist Crying or Very sad

Its definatly an M38 pump. I have rebuilt one before using a military rebuild kit but those are almost impossible to find anymore plus the diaphrams probably wouldnt be anygood anyway. Anyone have any ideas on what kind of number to send them or where to find a number on the pump?

Thanks

OKCM38CDN · Guest

There are very small numbers on the rings at the top and bottom of the pump... did you find those...

Try John Bizal at MWM... he also has kits...

gamillerman · Posted: Mon Oct 30, 2006 8:45 pm Post subject:

I found one on the top.mine doesnt have any on the bottom. I also found a number on the inside of the lower cover. This evening I found another one hand stamped on the edge of the housing where it mates to the block. I just found this number this evening and emailed them back with some more photos.

wesk · Posted: Mon Oct 30, 2006 11:37 pm Post subject:

I assume we are referring to this pump:

These pumps evolved thru many changes most of which are internal. The only significant external change is the hand priming lever.

If you sent a photo of a pump like this to Then and Now and they said they didn't see a vacuum section then Then and Now is in serious trouble. I haven't rebuilt a lot of these in the last few years. During the 90's I had no problem rebuilding the several I had with the standard across the parts counter kits
_________________
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

gamillerman · Posted: Tue Oct 31, 2006 4:43 am Post subject:

Thats the one Wes. And I though I had sent them 3 good photos of the pump. " The pump appears to be a single action" was in the email they sent me back....I had initially forgot to attach the photos to my first email to them...maybe they got mine mixed up with someone elses. I remailed them again last nite with 4 more photos so maybe it will work out this time. I contacted them because old fuel pumps are their main business and I hadnt seen anyone speak ill of them. We'll see what comes back today. I also posted the photos in my gallery

gamillerman · Posted: Fri Nov 03, 2006 2:13 pm Post subject:

Finally got an answer from Then and Now Automotive on my fuel pump. They do have complete kits available for both the top and bottom of the pump. I though I would also pass along this word of caution from them concerning the priming lever on the M-series vehicles:
One important thing to note about this type of pump- the lever on the front of it is a priming level. It allows you to pull the pump linkage manually to move some fuel into the pump and carb after storage. It does that by a little cam that pushes on the fuel linkage. This feature poses a unique problem- when the lever is left in the wrong place, it will interfere with the free travel of the pump during operation. That either keeps the pump from working, or it leads to wear out of the little eccentric cam. No parts for this priming lever are available- so be careful with the ones you have!
...costs quoted to me by them is $47.50 and $9.50 shipping

wesk · Posted: Fri Nov 03, 2006 9:50 pm Post subject:

Now you know why Uncle stop using the hand prime pump.

Is that the total cost for the kit?
_________________
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

gamillerman · Posted: Sat Nov 04, 2006 3:40 pm Post subject:

Yes...........for what they say is included:The kit contains the two diaphragm assemblies (fuel or vacuum diaphragm, steel protector plates and pull rod- rivited together), the 10 check valves, 10 check valve gaskets, the pulsator cover gasket, the bowl gasket on the vacuum side, the seals inside the pump, the pin and bushing and rocker arm spring, and the gasket to the block. everything needed to get the pump back in working order.
I figure thats not a bad price considering I paid $20.00 for a military rebuild kit (it was still in a sealed container) a longggggggg time ago. I am going to order it here in a week or so and I will let everyone know how the quality of the parts look and compare to what comes out of the pump. And by the way.....apparently the number they really need off the pump is stamped on the edge of the pump where it goes against the spacer. Mine was stamped in the side facing toward the front of the engine. If you look at my gallery I posted some photos of the pump and its the location of the 9810 number. this is a hand stamped number.not made into the casting

LoboMike · Posted: Sun Nov 05, 2006 6:11 am Post subject: Fuel pump - priming handle

So what is the coorect place to leave the priming pump handle, up or down?

TIA

wesk · Posted: Sun Nov 05, 2006 10:54 am Post subject:

I'd have to go look at one again. It would go to the direction of least resistance.
_________________
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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