310 Waukesha diesel dies

Jim Meade

Member
Does anyone know anything about the anti-siphon valve at the top of the Roosa Master fuel pump on the 310 Waukesha?

I have turbocharged 310 Waukesha that I was out mowing with all day. At the end of the day, it began to bog down and eventually died. The next day, I got it running and took it to the fuel barrel.

I topped it off with 18 gallons, so it was about half full. I replaced the glass fuel filter which looked perfectly clean. The fuel ran freely out of the tractor tank. The air filter is pristine. I went back out to mow and at first it ran fine but within 1/2 to 3/4 of a mile it died again. It would not start right away. An hour later, I drove the tractor back to the house.

There is no unusual smoke. The engine runs smoothly and sounds fine. It pulls with full authority until it starts to bog down, then it acts like is is under load and eventually dies.

I"m wondering if the anti-siphon valve on the top of the pump is bad and lets the pump build up pressure so it essentially runs itself out of fuel?
 
If the rubber governor band is breaking up it will plug the check valve in the elbow on top of the pump and shut the engine down until the pressure leaks off then it will run again for a while.
 
The fitting is a housing pressure control valve, not anti siphon. Most likely getting plugged from the governor weight retainer ring failing with bits that look like coffee grounds. When housing pressure rises high enough to equal transfer pressure the plungers will stop moving on the charge stroke, shutting the engine down. Best repair it soon before the weight retainer pins shear off, causing much more expensive damage.
 
Changed the rubber T boots out on my 1950T the other day and plugged the return line to the tank (mostly because I'm not very smart). Tractor would start right up and then die immediately, took a minute to figure out what I had screwed up. I would think that a restricted return line from the last injector to the tank could cause this to happen over a slightly longer period of time. It would sure be very easy to check this out first, prior to looking further.
 
This same thing happened to my 1950. What happened was the plastic cap I had on my fuel filler nozzle fell into the tank. I thought it would float and I would fish it out later or never. It didn't float and slid over and covered the tank outlet and starved the engine occasionally. I probably could write a book as to what I did to find this simple fix.

Good luck.
 
I took the pump to a rebuilder and this is exactly what the problem was. $850 later - (assuming nothing else is wrong).
 

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