M170 Carburetor and Fuel Pump rebuilds

iwojimavet · Post by **iwojimavet** » Fri Aug 31, 2012 5:15 pm

Hi everyone, an M170 neophyte here. I had a mechanic look at my M170, and the carburetor needs rebuilding, and he says the fuel pump needs to be replaced or rebuilt. After I woke up from passing out at the price he gave me, I thought can I do it myself? I looked at a blowout/parts diagram for both, and it looks pretty straight forward. Is this something I can tackle myself with everyday tools, and given I have not done it before? Second, how do you know when a fuel pump needs to be replaced instead of rebuilt?
I've located some rebuild kits on EBay...I guess that's a start.

hillbilly21 · Post by **hillbilly21** » Fri Aug 31, 2012 7:09 pm

GIVE MIDWEST MILITARY A CALL ASK FOR JOHN ..HE IS THE BIG GUN THERE !! I AM SURE HE HAS ONE THAT IS REBUILT ALREADY TO GO ..JUST HAVE TO SEND HIM YOUR CORE..I HAVE BOUGHT SEVERAL REBUILT CARBS FROM HIM WITHOUT ANY PROBLEMS !!!!!!!!
HE ALSO HAS THE CORRECT FUEL-VAC FUEL PUMPS ALREADY REBUILT ALSO ........

Post by **wesk** » Sat Sep 01, 2012 1:16 am

Is this something I can tackle myself with everyday tools, and given I have not done it before? Second, how do you know when a fuel pump needs to be replaced instead of rebuilt?

Sure it is. But it must be done correctly IAW the component overhaul manual. Just download the two applicable manual excerpts loaded on our download page. Read thru them and if there's anything you do not understand or any tools you are not familiar with let us know here on this board and we'll try to help you out.

The pump should be replaced only if you find in the manual that it doesn't pass an inspection item for which you cannot find repair parts.

skyjeep50 · Post by **skyjeep50** » Sat Sep 01, 2012 7:36 am

Another Source is "Then and Now Automotive" - they supply parts as well as rebuilding services. I had a M38 fuel pump rebuilt by them and it has worked great. Their website is: http://maritimedragracing.com/then_and_ ... e___se.htm

oilleaker1 · Post by **oilleaker1** » Mon Sep 03, 2012 7:38 am

You can do it yourself, try and get the good later produced kits with the more compatable rubber diaphrams. One thing I missed was checking the fuel pump surface where it meets the spacer/block for flatness. If the previous owner tightened it too much, it warps the surface and even with gaskets and sealer, it leaks oil and drives you crazy. The spring tension on that pump is amazing!

You don't want to do it twice, and remember to turn the engine over so the pump arm is on the lowest point of the cam lobe. Pay attention on the carburator where the two types of diaphram springs go. Also check the very small holes in the brass orifices for blockages----------even new ones. John

getsome · Post by **getsome** » Fri Jan 11, 2013 10:07 am

I have a 1963 M170 but it does not have the original carburetor. Can someone tell me what carburetor was the original?
THanks
Chris

evanso1975 · Post by **evanso1975** » Fri Jan 11, 2013 10:33 am

Same as the M38A1 (Carter YS950S). Wes has some good photos in his M38A1 M170 Fuel System album:
http://www.willysmjeeps.com/v2/modules. ... _album.php

They pop up often on Ebay quite often. But as with all things on Ebay, you run the risk of how willing the vendor is to rip you off.

Owen.

Post by **wesk** » Fri Jan 11, 2013 10:35 am

Carter YS950S . If you review your Operator's Manual TM 9-8014 for each system there is a specifications page listing system components by type/model and specs. If you do not have a TM 9-8014 then download it free in PDF format on our downloads page.
http://www.willysmjeeps.com/v2/modules. ... eA&show=10

Don't hesitate to use my Photo album as a technical resource:
http://www.willysmjeeps.com/v2/modules. ... _album.php

getsome · Post by **getsome** » Fri Jan 11, 2013 10:39 am

thanks all. I appreciate it!