Create an account Home  ·  ·  Forums  ·  ·  Articles  ·  ·  Downloads  ·  ·  Photo Gallery  
Login
Nickname

Password

Don't have an account yet? You can create one here.

Navigation
· Home
· Article Archive
· Article Submit
· Downloads
· FAQ
· Forums
· Members List
· Photo Gallery
· Private Messages
· Web Links
· Your Account

Search Articles



Forums

Wiper motor...which is the correct one?
Lead additive, one more question.
M31C mount with or without replica weapon
Backfire and Hesitation
Wanted: Steering column and shaft for M38-1952, or late CJ2A
2024 CT. MILITARY VEHICLE SHOW AND FLEA MARKET- JUNE 15,2024
Brake Line
How to link full size photos in posts
Clutch release bearing support cast tab for return spring
T90 case replacement required?

Willys M Jeeps Forums


willysmjeeps.com :: View topic - M38A1 Fuel Pumps
 Forum FAQForum FAQ   SearchSearch   UsergroupsUsergroups   ProfileProfile   Log in to check your private messagesLog in to check your private messages   Log inLog in 

M38A1 Fuel Pumps
Goto page 1, 2  Next
 
Post new topic   Reply to topic    willysmjeeps.com Forum Index -> Technical Knowledge Base
View previous topic :: View next topic  
Author Message
cobra5
Member


Joined: Mar 10, 2013
Posts: 103
Location: Stevensville, Montana

PostPosted: Thu Aug 27, 2020 9:59 am    Post subject: M38A1 Fuel Pumps Reply with quote

Since original pumps are hard to find, has anyone found a viable replacement that will work? Searching the web I came across these two.
https://www.quadratec.com/products/917709_03.htm
https://www.quadratec.com/products/917709_04.htm
They are different in appearance but one states it will fit the A-1. However, both state they will fit a CJ3A which is basically the civilian version of the M38. The reason I mention this is because I read where the M38 and the A-1 used the same fuel pumps.
Anyone have some insight?
_________________
1951 M37 WOW, 1953 M37 WOW, 1954 M37 WOW, 1953 M38-A1, 1954 M38-A1, 1964 M151-A1, 1967 M151-A1, 1968 M151-A1, 1978 M151-A2, 1989 M35A2C, 1965 M416, 1966 M416, 1967 M416
MSgt, USAF Retired 1/84-10/05
Back to top
View user's profile Send private message Send e-mail
DaveM38A1
Member


Joined: Oct 28, 2008
Posts: 99
Location: Fuquay-Varina, North Carolina

PostPosted: Thu Aug 27, 2020 12:00 pm    Post subject: Reply with quote

The thick spacer dictates the fuel pump pressure.
Make sure you have one.

Had a more modern aftermarket dual action fuel pump on the Civilian 64 CJ5 when I got it and the fuel pressure was way too high. Had to run a fuel pressure regulator to keep from always flooding the carb.


Don't know if these will physically fit, but the fuel pressure might be too high also.

Used a rebuild kit on mine for the M38A1, but I've not gotten it running to test it.

Got it from:



http://www.then-now-auto.com/fuel-pumps/



Dave
_________________
1955 M38A1
1964 CJ5
1968 M274 Pepe'
Back to top
View user's profile Send private message
wesk
Site Administrator
Site Administrator


Joined: Apr 04, 2005
Posts: 16225
Location: Wisconsin

PostPosted: Thu Aug 27, 2020 12:16 pm    Post subject: Reply with quote

There are many fuel pumps from the jeep line that will fit and work on the M38/M38A1 (L-134 & F-134) engines. Some require some adaptation. The most common civilian dual action pump is the CJ3B F-134 unit that matches the engine but needs the vacuum lines adapted from tubing fittings to hose tubes. To regualte the pump's output pressure Willys went with varied thickness pump to block spacers. So when you substitute a civvy pump and it's pressure is incorrect with the original 9/16" thick spacer then just fabricate different thickness spacers to come up with the desired pressure.

There are about 6 different military dual action pumps used on the M38/M38A1/M170 series jeeps. The military simply kept superseding to the later pumps in their supply system. Yes they all will work on all three jeeps.

If you do not use vacuum wipers then you can certainly substitute a civvy single action pump. Just work in the correct thickness spacer to regulate pressure correctly.
_________________
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
Back to top
View user's profile Send private message Send e-mail Visit poster's website
cobra5
Member


Joined: Mar 10, 2013
Posts: 103
Location: Stevensville, Montana

PostPosted: Thu Aug 27, 2020 1:08 pm    Post subject: Reply with quote

Ok I'm going to go with one in the link. Anyone else using it and know the thickness of the required spacer? I searched the forum and I think I found my answer 1/8 spacer. Is this right?
https://www.quadratec.com/products/917709_04.htm
_________________
1951 M37 WOW, 1953 M37 WOW, 1954 M37 WOW, 1953 M38-A1, 1954 M38-A1, 1964 M151-A1, 1967 M151-A1, 1968 M151-A1, 1978 M151-A2, 1989 M35A2C, 1965 M416, 1966 M416, 1967 M416
MSgt, USAF Retired 1/84-10/05
Back to top
View user's profile Send private message Send e-mail
WillysMotors
Contributor
Contributor


Joined: Jan 19, 2006
Posts: 111

PostPosted: Thu Aug 27, 2020 8:13 pm    Post subject: Reply with quote

Rock Auto is about $80
Back to top
View user's profile Send private message
wesk
Site Administrator
Site Administrator


Joined: Apr 04, 2005
Posts: 16225
Location: Wisconsin

PostPosted: Thu Aug 27, 2020 8:19 pm    Post subject: Reply with quote

Quote:
I searched the forum and I think I found my answer 1/8 spacer. Is this right?

Can't say either way without knowing the AC part number of the fuel pump.
_________________
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
Back to top
View user's profile Send private message Send e-mail Visit poster's website
4x4M38
Member


Joined: May 30, 2014
Posts: 3440
Location: Texas Hill Country

PostPosted: Thu Aug 27, 2020 10:17 pm    Post subject: Reply with quote

The correct pumps are not hard to find.

First rattle out of the box...

https://www.ebay.com/itm/M38-M38A1-WILLYS-JEEP-G740-G758-FUEL-PUMP-F134-CJ2A-CJ5-/392917220032
_________________
Brian
1950 M38
MC11481
http://www.willysmjeeps.com/v2/modules.php?set_albumName=album372&op=modload&name=gallery&file=index&include=view_album.php
Back to top
View user's profile Send private message Send e-mail
cobra5
Member


Joined: Mar 10, 2013
Posts: 103
Location: Stevensville, Montana

PostPosted: Mon Aug 31, 2020 5:16 pm    Post subject: Reply with quote

4x4M38 wrote:
The correct pumps are not hard to find.

First rattle out of the box...

https://www.ebay.com/itm/M38-M38A1-WILLYS-JEEP-G740-G758-FUEL-PUMP-F134-CJ2A-CJ5-/392917220032


That ended back in Apr.
_________________
1951 M37 WOW, 1953 M37 WOW, 1954 M37 WOW, 1953 M38-A1, 1954 M38-A1, 1964 M151-A1, 1967 M151-A1, 1968 M151-A1, 1978 M151-A2, 1989 M35A2C, 1965 M416, 1966 M416, 1967 M416
MSgt, USAF Retired 1/84-10/05
Back to top
View user's profile Send private message Send e-mail
RonD2
Member


Joined: Oct 02, 2014
Posts: 1887
Location: South Carolina, Dorchester County

PostPosted: Mon Aug 31, 2020 6:29 pm    Post subject: Reply with quote

Nope. August not April. How do I know? Because I bought it. Needed a re-buildable core for a spare. A little pricey at $87.50 (delivered, with tax), but patience got the best of me. Laughing
_________________
Ron D.
1951 M38 Unknown Serial Number
1951 M100 Dunbar Kapple 01169903 dod 5-51

“The only good sports car that America ever made was the Jeep."
--- Enzo Ferrari

Back to top
View user's profile Send private message Send e-mail
4x4M38
Member


Joined: May 30, 2014
Posts: 3440
Location: Texas Hill Country

PostPosted: Tue Sep 01, 2020 10:40 am    Post subject: Reply with quote

My point.

They are around.

George has them but requires a core or $100 core charge.

https://www.armyjeepparts.com/p-1807-fuel-vacuum-pump-assembly-m38a1-willys-jeep-rebuilt-ajp-wo-805727.aspx?network=g&device=m&keyword=&campaign=10021784069&adgroup=pla-296106487560&gclid=EAIaIQobChMI_sfErLDI6wIVj4bACh0PfQaKEAQYAiABEgIR0vD_BwE

Have you tried calling the suppliers? There’s no way they have everything listed on line. If you’ve ever seen photos of their inventory you can see that. Army Jeep Parts, Midwest Military, Brent Mullins Jeep Parts, Quarter Ton Military, etc.. Plus you have a chance to talk to some really nice and knowledgeable folks in most cases, and possibly develop a relationship. That’s important in any hobby, including this one. Those guys all know each other, and can help.

There is one on eBay, from Bulgaria? You are on your own there.
_________________
Brian
1950 M38
MC11481
http://www.willysmjeeps.com/v2/modules.php?set_albumName=album372&op=modload&name=gallery&file=index&include=view_album.php
Back to top
View user's profile Send private message Send e-mail
cobra5
Member


Joined: Mar 10, 2013
Posts: 103
Location: Stevensville, Montana

PostPosted: Tue Sep 01, 2020 10:43 am    Post subject: Reply with quote

RonD2 wrote:
Nope. August not April. How do I know? Because I bought it. Needed a re-buildable core for a spare. A little pricey at $87.50 (delivered, with tax), but patience got the best of me. Laughing


That's strange because when I click on the link it clearly shows it end April 29, 2020.

Updated: Never mind I went further back and opened the original listing and it shows Aug. I went and tried the link again and it now says Aug. Don't know whats going on but I should have taken a photo of it.
_________________
1951 M37 WOW, 1953 M37 WOW, 1954 M37 WOW, 1953 M38-A1, 1954 M38-A1, 1964 M151-A1, 1967 M151-A1, 1968 M151-A1, 1978 M151-A2, 1989 M35A2C, 1965 M416, 1966 M416, 1967 M416
MSgt, USAF Retired 1/84-10/05


Last edited by cobra5 on Tue Sep 01, 2020 10:52 am; edited 1 time in total
Back to top
View user's profile Send private message Send e-mail
cobra5
Member


Joined: Mar 10, 2013
Posts: 103
Location: Stevensville, Montana

PostPosted: Tue Sep 01, 2020 10:47 am    Post subject: Reply with quote

4x4M38 wrote:
My point.

They are around.

George has them but requires a core or $100 core charge.

https://www.armyjeepparts.com/p-1807-fuel-vacuum-pump-assembly-m38a1-willys-jeep-rebuilt-ajp-wo-805727.aspx?network=g&device=m&keyword=&campaign=10021784069&adgroup=pla-296106487560&gclid=EAIaIQobChMI_sfErLDI6wIVj4bACh0PfQaKEAQYAiABEgIR0vD_BwE

Have you tried calling the suppliers? There’s no way they have everything listed on line. If you’ve ever seen photos of their inventory you can see that. Army Jeep Parts, Midwest Military, Brent Mullins Jeep Parts, Quarter Ton Military, etc.. Plus you have a chance to talk to some really nice and knowledgeable folks in most cases, and possibly develop a relationship. That’s important in any hobby, including this one. Those guys all know each other, and can help.

There is one on eBay, from Bulgaria? You are on your own there.



They are around but don't seem to come up as frequently as one would think.
_________________
1951 M37 WOW, 1953 M37 WOW, 1954 M37 WOW, 1953 M38-A1, 1954 M38-A1, 1964 M151-A1, 1967 M151-A1, 1968 M151-A1, 1978 M151-A2, 1989 M35A2C, 1965 M416, 1966 M416, 1967 M416
MSgt, USAF Retired 1/84-10/05
Back to top
View user's profile Send private message Send e-mail
cobra5
Member


Joined: Mar 10, 2013
Posts: 103
Location: Stevensville, Montana

PostPosted: Thu Sep 10, 2020 10:03 am    Post subject: Reply with quote

wesk wrote:
Quote:
I searched the forum and I think I found my answer 1/8 spacer. Is this right?

Can't say either way without knowing the AC part number of the fuel pump.


This is the pump I bought.

https://www.rockauto.com/en/moreinfo.php?pk=59028&cc=1421121&jsn=1&jsn=1
_________________
1951 M37 WOW, 1953 M37 WOW, 1954 M37 WOW, 1953 M38-A1, 1954 M38-A1, 1964 M151-A1, 1967 M151-A1, 1968 M151-A1, 1978 M151-A2, 1989 M35A2C, 1965 M416, 1966 M416, 1967 M416
MSgt, USAF Retired 1/84-10/05
Back to top
View user's profile Send private message Send e-mail
wesk
Site Administrator
Site Administrator


Joined: Apr 04, 2005
Posts: 16225
Location: Wisconsin

PostPosted: Thu Sep 10, 2020 11:00 am    Post subject: Reply with quote

That site does not offer a AC part number for which their odd number pump is a sub for. You are back to experimenting with spacers till you find one the gives the correct operating pressure.
_________________
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
Back to top
View user's profile Send private message Send e-mail Visit poster's website
RonD2
Member


Joined: Oct 02, 2014
Posts: 1887
Location: South Carolina, Dorchester County

PostPosted: Thu Sep 10, 2020 11:09 am    Post subject: Reply with quote

That site gives this Alternate/OEM Part Number(s): 5594698

Isn't that the AC number?

Maximum Pressure Rate (psi) 3.75
Minimum Free Flow Rate (gph) 15 GPH @ 1000 RPM
Minimum Pressure Rate (psi) 2.5
_________________
Ron D.
1951 M38 Unknown Serial Number
1951 M100 Dunbar Kapple 01169903 dod 5-51

“The only good sports car that America ever made was the Jeep."
--- Enzo Ferrari

Back to top
View user's profile Send private message Send e-mail
Display posts from previous:   
Post new topic   Reply to topic    willysmjeeps.com Forum Index -> Technical Knowledge Base All times are GMT - 6 Hours
Goto page 1, 2  Next
Page 1 of 2

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum

Powered by phpBB © 2001 phpBB Group
Forums ©

 



PHP-Nuke Copyright © 2005 by Francisco Burzi. This is free software, and you may redistribute it under the GPL. PHP-Nuke comes with absolutely no warranty, for details, see the license.