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M38A1 fuel filter mod
Looking for info on the typical fuel filter mod done on M38A1 jeeps. Not sure if the CF ever endorsed the use of disposable filters inline other than the in tank filter. I have seen numerous atrocities when it comes to placement, wondering if there was ever a CFTO on this? Putting a filter in place prior to the fuel pump makes sense to me.
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3RD Echelon Wksp 1968 M274A5 Mule Baifield USMC 1966 M274A2 Mule BMY USMC 1958 M274 Mule Willys US Army 1970 M38A1 CDN3 70-08715 1 CSR 1981 MANAC 3/4T CDN trailer 1943 Converto Airborne Trailer 1983 M1009 CUCV RT-524, PRC-77s, and trucks and stuff and more stuff and and....... OMVA, MVPA, G503, Steel Soldiers |
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Nope. And I saw certain Jeeps get new carbs again and again and again. I had a problem Jeep like that at Minto Armoury, and another in camp Dundurn, and when I tried to set the float level, realized there was a fine red sand in the bottom of the float bowl. It was rust. Best solution was to replace the tank. The stone filter was just too course to filter out the rust particles, and they would cause the needle to stick. I started to install fuel filters, but it was so close to the end of service for the M38A1s, there was no point doing a TFR.
I liked using the M151A2 filter right at the carb, but the best solution was to remove the top of the fuel pump, clean out the sediment that collected there, then cut the rubber line before the pump and install an inline filter. You also have to remember that back then the Jeeps were only around 15 years old. Now they are 50. |
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One of my 1970s has a fuel filter right before the carb. An easy place to get to for replacement. I am in the process of doing new fuel lines and will be using a repro fuel line kit so I was hoping to do something that is at least semi-correct with regard to the original line routing. Is it better to install prior to the pump or prior to the carb? My carb is a fresh rebuild and I also have the new in tank filter offered by AJP and others...
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3RD Echelon Wksp 1968 M274A5 Mule Baifield USMC 1966 M274A2 Mule BMY USMC 1958 M274 Mule Willys US Army 1970 M38A1 CDN3 70-08715 1 CSR 1981 MANAC 3/4T CDN trailer 1943 Converto Airborne Trailer 1983 M1009 CUCV RT-524, PRC-77s, and trucks and stuff and more stuff and and....... OMVA, MVPA, G503, Steel Soldiers |
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I don't know what the micron rating is of those new filter kits.
The best place is just before the fuel pump. The reason I say this is because the particles can also unseat the little check valves in the fuel pump, causing the pump to go to idle and not pump fuel. But owing to the coarseness of the fuel pump check valves, it would have to be fairly substantial particles. As I mentioned before, remove the top of the fuel pump (I think it is about 8 screws) and remove the fuel portion of the pump. Clean it out then re-install. Now you can install the inline filter just before the pump. The reaon you have to clean out the pump is otherwise the sediment in the pump will continue to find it's way up to the carb. If that does happen, it will usually happen when you pull up to a stop sign. The engine will rumble a little, then drown itself. You have to get out of the truck, move the machine gun mount, lift the hood, then turn off the little tap that is on the frame just before the pump. Now crank the Jeep until it starts, then jump back out, open the tap, close the hood, move the MG arm back in place, and hit the road. Or just install the fuel filter. |
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Rob: it sounds like you might "know someone" who can do some quick work at a stop sign.
Good info. I have been planning to add a fuel filter also. I was hoping to find a filter that would thread on to the rubber hose connection down by the shut-off valve. Post some photos when you get yours set up Chris.
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1953 M37 CDN 1953 M38A1 CDN 1967 M38A1 CDN2 |
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You can merely splice the rubber hose with a regular inline (might I suggest the clear ones) fuel filter. Or you can get fancy and install the inline filter off a 70s Ford truck (that was what the M151A2 used). It shoudl thread in to the fuel pump, although you may have to use a 1/4" m-f pipe elbow to get the direction right. I think, by memory though, that the stock flex fuel line might be too small a fitting to match up to the Ford fuel filter. I'll check when I am at work tomorrow, I stock both items there. Personally, I have usually gone with the filter at the carb and spliced one in at the pump.
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