M-135 Fuel Pressure?

[Dano McLaren]

Hi All. We are going to try to get my deuce started this weekend. The tank is contaminated so I am going to feed it fuel via a 12 volt fuel pump. The question is, what amount of pressure is required. Has anyone done this before.

[Stan Leschert]

When my mechanic gets back from Normandy, I will check.

We put a 24v frame mounted pump on, and a Holley pressure regulator. Make sure to add fuel water separator and spin on fuel filter.

You are going to have to modify the in tank fuel pickup, as it won't work with an external pump. It has an internal check valve that acts an over pressure bypass. There was a thread on Steel Soldiers which covered it. I added my findings.

I think that the PSI was in the 4-6 range, adjust as req.

[rob love]

Right from TM9-819A, Pressure is a low 3-¼ to 5 psi. There are a couple of bleed holes in the pickup line after the original in tank pump. One is right at the pump, which will not be an issue unless you let the fuel level get low. The other is right at the top of the pickup line, and this one will be a problem. You have to plug it with something or your pump will pick up the path of least resistance and pump mostly air.

I ran my truck with a 24V external pump for the first winter. Come spring I was able to run a gallon of acetone through the tank which cleaned it up to near perfection, and returned to the original in tank fuel pump, like the Gods intended. If you do run acetone, make sure you remove the fuel pump first, or it will turn the rubber mounts and the bottom plug into goo.

[Dano McLaren]

thanks Rob. I will let you know how it turns out.

[Dano McLaren]

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IMG_5153.jpgAfter sitting for over 8 years, we got my M-220 running today. Drawing fuel direct from a Jerry can mounted on the step, then through an inline filter and to the carb. Purrs like a very large kitten.

[rob love]

Glad to hear it worked for you. Don't expect to go too far on that one measly can of gas though. They are a very thirsty truck.