Forum Replies Created
-
Posts
-
To clarify things a bit for others, the priming pump is the hand operated plunger attached to the lift pump, and it utilizes the check valves in the lift pump. This all goes away if an electric pump is installed. :good:
Account deleted.
Blue,
On your fuel flow diagram, I take it that the red line is the supply to the injection pump? If so, it should first pass through the secondary fuel (oil?) filter. Also, there should be a primary fuel filter (in-line see through) on the electric pump suction side. I presume the green line is the fuel return line, which should return to the top of the fuel tank, either directly or via the injector leak off lines. Returning to the lift pump suction could cause aeration of the fuel.
Account deleted.
The piston is attached to the cover, so yes. You will probably have to remove the hoses, so be sure to mark them. The elbow fitting at the front of the cover is the pressure supply to the lift piston. The cover is heavy.
Account deleted.
I have seen a couple of new compact excavators with no mechanical lift/priming pump at all, just an electric pump. This may be the future for OEM’s. I know if mine ever fails again I’ll just toss it and install an electric. My F-350 6.4 diesel has an electric fuel pump.
I bought my pump from Tommy at Affordable. It should be noted that there are two configurations for the lift pump – priming plunger can be on the right or left side, and this has to do with how the check valves are installed. The arrangement might be able to be changed in the field.
Account deleted.
FWIW, you can get these almost anywhere. Hook them up with a relay to your key switch. Takes care of the priming task too.
Account deleted.
Yep, that’s it. Be sure to replace it with a nitrile one. There are quite a few manufacturers of those lift pumps, and they are all basically the same. The ones on my Mitsubishi and Yanmar diesels are identical, even according to the parts book illustrations. There aren’t any seals on the piston either. Hope that’s the issue, and not the other.
Account deleted.
It happened again just now, but yes, last night I was getting the “404” too.
Account deleted.
Hi Bob,
The valve spools are lap-fitted just like fuel injector pumps. That and ultra clean hydraulic oil is what really keeps them from leaking. If they are only slightly collecting dust and dirt you may be ok with O-rings for awhile. :unsure:
Hope your water heater issue is resolved Eric. :yes:
Account deleted.
That engine does not have a oil line feeding it. It’s prob. the fuel injector pump leaking by internally causing the problems. Not many other ways for the fuel to get into the crankcase.
Tommy
Exactly what I was thinking. There is no other way. I’m thinking it’s hydraulic oil from a blown pump seal which is a more common failure caused by deadheading.
Cragarmags, check your hydraulic reservoir and fuel tank levels. In either case, one of them should be just about empty. Also, check your fuel injection pump/governor oil level. Let us know what you find.
Account deleted.
Man, that’s an awful lot of fuel in the base for that amount of operating time. Are you sure it’s fuel and not hydraulic oil? Because there is no direct path for fuel to get into the base. The fuel injection and priming pumps can be ruled out entirely because they have their own oil sump, and if that sump became full of fuel enough it would be spewing out the vent and dipstick before it went through the camshaft seal into the base. If you were over-fueling enough to let the fuel injection pump and injectors pump that much fuel by the rings there would be volumes of blue/black smoke coming from the exhaust. Something isn’t right. Have you done a compression check? Checked the valve lash lately?
Account deleted.
