Need 2 Fuel system parts M151A1

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Shotgun
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Need 2 Fuel system parts M151A1

Unread post by Shotgun » April 3rd, 2017, 4:50 pm

Hello All,
My M151A1 was running sluggish and I decided to look into the fuel system. Upon inspection, my large in tank filter was clogged towards the bottom and my fuel tank had some heavy rust spots and I used vinegar to remove a significant amount of rust. I have a new fuel hose and new fuel filter (last picture) that I want to install to keep additional particulates out but am missing the proper elbow for the fuel filter (TM 9-2320-218-34P Fig 20, item 1 NSN 4730-01-088-9309, PN 11668003) and nut (Fig 20, item 2 NSN 4730-00-832-5670, PN B122-2D-2). Anybody have a source for these? Tried TNJ Murray and Army Jeep Parts without success and nothing showed up on evilbay.

The PO put in a Zenith Carb (PN 11681709 on top) and it has a straight fuel hose from bulkhead terminating in an elbow with a crooked (crossed?) nut/adapter going into the carb. I am reluctant to remove the current configuration especially since it isn't leaking but might be cross threaded and I want to put everything in at once to minimize any headaches.

Any assistance would be greatly appreciated, and thanks again,
Steve

FYI: I used generic white vinegar (5 gallons) from Food lion and a bottle of Crossman BBs. I drained the fuel and let it air out a few days then added the vinegar and BBs to tank. I sloshed the vinegar every few days, and on occasion used a bottle brush to knock down rust and then drained the vinegar after 2 weeks. I took it to a coin operated car wash place, drained the tank, (less than a gallon recovered, lost most from leakage) sprayed it down, then added baking soda to neutralize the vinegar, then a final powered rinse.

At home, I drained the water that remained in the tank and recovered the BBs. There was a lot of rust that came out and I used a heat gun to dry out the interior. Once the interior was dried, I hit the top of the tank and more rust flakes came off. I tried to vacuum out the interior but ended up using a leaf blower because it had a much higher volume and was a lot better as it pushed everything out.

I might use Metal Rescue and see if that will take out some residual rust - the tank looks a lot better than what I started with. I just have to add the Metal Rescue to the dry tank, because it has no fuel, gunk or varnish, that was already removed with the vinegar and rinsing, any of that kind of residue affects Metal Rescue (water based). All I need to do after the Metal Rescue removes the rust is to rinse it out with gas to remove the water. I guess with some wordsmithing, I could put this into the Technical Discussion section...


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Field Artillery 1994-2015 - Retired!
Airborne 1994-1998
Air Defense Artillery (IHAWK) 1981-1993

1968 M151A1 with M416 Trailer
1960 M422A1 (needs restoration) with M416B1 Trailer

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rickf
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Re: Need 2 Fuel system parts M151A1

Unread post by rickf » April 3rd, 2017, 7:44 pm

You are probably the first person I have ever seen that asked for the correct parts for the fuel line into the carburetor! The picture you show there looks nothing like the correct piece and what you describe as being there sounds pretty much like the right piece. Can you get a picture of the one that is on there? They are going to be just about impossible to find.
1964 M151A1
1984 M1008
1967 M416
04/1952 M100
12/1952 M100- Departed
AN/TSQ-114A Trailblazer- Gone

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Re: Need 2 Fuel system parts M151A1

Unread post by lpcoating » April 3rd, 2017, 8:25 pm

Anyone have one to copy? I know a guy that has the resources to make a part like this. Not sure what my A1 has on it. Will have to look

Guy
M151 Body Panels - http://www.m151bodypanels.com/

'68 A1 - Under full resto

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Re: Need 2 Fuel system parts M151A1

Unread post by rickf » April 3rd, 2017, 8:34 pm

I have the A1 and A2 but I would have to be sure I got them back fairly quickly. The 90 degree fitting is available as a plumbing part but the lockout and plastic washer are not, I am not sure about the 30 degree fitting for the A2 but again, the locknut and plastic sealing washer are the same as the A1 and not available.
1964 M151A1
1984 M1008
1967 M416
04/1952 M100
12/1952 M100- Departed
AN/TSQ-114A Trailblazer- Gone

Shotgun
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Re: Need 2 Fuel system parts M151A1

Unread post by Shotgun » April 3rd, 2017, 9:00 pm

rickf,
TNJ Murray has a lock nut, but it didn't reference correctly in the 34P, the 34P indicates a seal and I'm not sure if this is the one you are referring to.

I am thinking if it is a standard plumbing part, then all that is needed is the 90 degree elbow, a 1/4 NPT (?) to fine thread adapter and then put on the fuel filter and hose, provided that I use the existing nut in the carb.

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Field Artillery 1994-2015 - Retired!
Airborne 1994-1998
Air Defense Artillery (IHAWK) 1981-1993

1968 M151A1 with M416 Trailer
1960 M422A1 (needs restoration) with M416B1 Trailer

fowlercal
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Re: Need 2 Fuel system parts M151A1

Unread post by fowlercal » April 3rd, 2017, 10:22 pm

I ordered some of these pipe locknuts a few months ago from Murray. They are the correct ones for the carb fuel inlet fitting.

Still looking for the 30 degree inlet fitting for the A2. Mine is stripped out, but still seals with the pipe locknut.

Cal

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Re: Need 2 Fuel system parts M151A1

Unread post by Shotgun » April 3rd, 2017, 10:37 pm

Cal,
So this would take care of one issue - I will take a picture of what is on the carb tomorrow when there is some light. The 34P shows that part number with a -1 as seal, nut pipe but it is correctly listed in the 20P, anyway it might be what I need. Thank you!
Field Artillery 1994-2015 - Retired!
Airborne 1994-1998
Air Defense Artillery (IHAWK) 1981-1993

1968 M151A1 with M416 Trailer
1960 M422A1 (needs restoration) with M416B1 Trailer

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rickf
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Re: Need 2 Fuel system parts M151A1

Unread post by rickf » April 4th, 2017, 11:33 am

The plumbing part is an angle fitting with the straight threads on one side and pipe threads on the other side. The key thing is that the threads are the same thread count and pitch, one is tapered pipe thread and one is straight thread. That is why so many people think the filter is supposed to thread right into the carb when in fact the carb is a straight tread and NOT a pipe thread. Now comes the big issue and I think this may be the problem Cal has, Once someone threads a filter into the carb and if they force it in far enough then they open the threads up to a pipe thread and the straight thread correct fitting no longer fits and acts like it is stripped. It will in fact pull the threads out of the carb if you are not careful. If you force a filter or pipe threaded fitting into the carb just a bit too far you will split the top of the carb and now the carb is junk.
1964 M151A1
1984 M1008
1967 M416
04/1952 M100
12/1952 M100- Departed
AN/TSQ-114A Trailblazer- Gone

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Re: Need 2 Fuel system parts M151A1

Unread post by Shotgun » April 4th, 2017, 2:25 pm

Thanks for that clarification regarding straight versus tapered fittings. The -20P has better descriptions and should have been the first manuaI checked out, also dates and changes are important too.

Top view
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Another angle
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The current fitting is large and coarse compared to the fine threaded fuel filter
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Fuel hose removed, the straight fitting rickf is describing
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Straight fitting
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Plenty slack for this combo
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Hose although opaque feels very stiff, I like that I can see if there is fuel in there or not. If all else fails, I could still use the new black fuel hose and remove the fitting on the carb side and put in a clear plastic inline fuel filter. I'd like to get it as close to period USGI correct, but then this isn't a trophy winning trailer queen. Looks like I am missing a cable retainer on that 100 AMP cable, its resting on the fuel line. On a side note, the PO installed a separate switch for the fuel pump, so I have to switch the ignition on, and then the fuel pump switch, then you can clearly hear the click-click-click sound of the fuel pump..
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Field Artillery 1994-2015 - Retired!
Airborne 1994-1998
Air Defense Artillery (IHAWK) 1981-1993

1968 M151A1 with M416 Trailer
1960 M422A1 (needs restoration) with M416B1 Trailer

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Re: Need 2 Fuel system parts M151A1

Unread post by Surveyor » April 4th, 2017, 4:15 pm

Makes me wonder if the fuel pump safety switch is now bypassed.

Why the lever on top of the intake? I've read where that is normally the go to location for running the wiper vacuum lines but that's usually after ditching the vacuum pump for a mechanical fuel pump and not using an in-tank electric. ???
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Shotgun
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Re: Need 2 Fuel system parts M151A1

Unread post by Shotgun » April 4th, 2017, 4:59 pm

Surveyor, I'm sure it is, though I have not chased the wiring since he modified it. He did say that the steering box was leaking and instead of taking everything apart properly, he cut the steering column and later rewelded it, and I now have a dash horn switch. The lever is to open up the vacuum lines for the wipers, I have not removed it, but will in the future to get it back to its original military configuration. I think those are the only big bubbafied things done to the ol' girl that I can recall right now.
Field Artillery 1994-2015 - Retired!
Airborne 1994-1998
Air Defense Artillery (IHAWK) 1981-1993

1968 M151A1 with M416 Trailer
1960 M422A1 (needs restoration) with M416B1 Trailer

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Re: Need 2 Fuel system parts M151A1

Unread post by rickf » April 4th, 2017, 6:07 pm

That is not the correct fitting and the section going into the carb is pipe thread. The good thing is that it is not screwed in to far and someone used the seal and locknut. The bad thing is that the fitting has been banged over and the threads are probably buggered. It is not that the nut is cross threaded, the threads are bent.That plastic pipe for the fuel line has to go! That is not compatible with gasoline. And the filter has a pipe thread on it but the fitting is straight thread with a male flare so they are not compatible. Since it is not leaking at this point I would leave the fitting alone on the carb, put your new black line on to the old short piece of pipe that is there on the plastic line now and then cut a section out of the black line in a convenient place and put in a clear filter.
1964 M151A1
1984 M1008
1967 M416
04/1952 M100
12/1952 M100- Departed
AN/TSQ-114A Trailblazer- Gone

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Re: Need 2 Fuel system parts M151A1

Unread post by Shotgun » April 4th, 2017, 6:40 pm

Thanks Rick, I should have clarified pipe thread filter fitting versus the flared line better, not just coarse/fine large or smaller but threaded versus flared = incompatibility. I was thinking along the same lines to reuse the fitting (what I meant to say), new hose and put in a see through fuel filter. As it is I don't want to mess with it anymore than I have to untiI I have all my parts ready to assemble. Aberdeen is coming up, and I will look for small hardware items that don't show up on eBay, and I might get a better deal or two. I will have to look for other similar small engine items for the other engine/trans that came with this deal.

I am still seeing rusty flakes in my gas tank, it's bone dry and in the house, not outside with more moisture to invite surface rust. I will use Metal Rescue and get rid of the remaining rust in the tank then get this all together, but right now until early May my dance card is full hahaha. Still debating on POR 15 fuel tank sealant.

Thank you, everyone, for your suggestions and tips!
Field Artillery 1994-2015 - Retired!
Airborne 1994-1998
Air Defense Artillery (IHAWK) 1981-1993

1968 M151A1 with M416 Trailer
1960 M422A1 (needs restoration) with M416B1 Trailer

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Re: Need 2 Fuel system parts M151A1

Unread post by rickf » April 4th, 2017, 8:32 pm

When you mentioned Aberdeen I had to see where you are from. We go to a trail ride and camping event in Syria Virginia every year over Labor day. I don't believe that is too far from you?
1964 M151A1
1984 M1008
1967 M416
04/1952 M100
12/1952 M100- Departed
AN/TSQ-114A Trailblazer- Gone

Shotgun
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Re: Need 2 Fuel system parts M151A1

Unread post by Shotgun » April 4th, 2017, 10:15 pm

Rick, I looked at the map on the internet and it's about an hour and a half from where I live. I think I might have seen something about the trail ride in one of the MV calendars. It looks like Syria, VA is closer than Aberdeen for me, certainly a long haul for you coming from NJ - now that's a haul!
Field Artillery 1994-2015 - Retired!
Airborne 1994-1998
Air Defense Artillery (IHAWK) 1981-1993

1968 M151A1 with M416 Trailer
1960 M422A1 (needs restoration) with M416B1 Trailer

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