diesel leak

[jakey999]

Follow-up;
Have 1967 Ford 3000 , diesel fuel leaking from
overflow tube on Simms fuel injection pump. Continually leaking when sitting. Have I&T shop manual but does not go into detail of repair.
Appreciate any input in this matter.

 

[Anonymous-0]

I am not used to the English pumps but they are based on a Bosch design. Everything is fine, except you need to drain the fuel and replace with new engine oil. Check your operators manual to start with. In time those sumps build up with fuel. That is why there is an overflow tube.

 

[RodinNS]

If there's a steady stream, let's hope it's a bad diaphram in the lift pump. Replace the lift pump, then change the oil in the cambox as described. That should take care of it. If it doesn't then I'd suspect a cracked fuel manifold in the pump...

Rod

 

[JDemaris]

Sitting when not running, or sitting with engine idling?

If it's a small amount of overflow, it won't hurt a thing. Most of the older inline Simms and CAV pumps get leakage from pump plungers over time. Those drips of diesel mix the oil in the cam box and it has to overflow after awhile. Just drain and change once in awhile so you're not running 100% diesel fuel in the cam box.

 

[jakey999]

I had just drained and refilled the injector pump housing and within a couple of weeks most of the oil was drained out.

 

[jakey999]

Rod, thanks for the reply, where would purchase a lift pump and would closing the fuel valve help, or would this drain the housing, that I would have to bleed the system.

 

[RodinNS]

You should be able to get the lift pump from NewHolland quite easily. Any diesel injection shop should also have them. That's quite a common pump. You could also take the pump (lift) apart and inspect it before buying one if you want to be sure.
Turning the tank valve off should stop it from siphoning when not in use... and it might help you narrow the problem down to insure that the pump is bad, but ultimately, if you're using the tractor, it's going to fill the cambox with fuel.
That may or may not necessate bleeding the pump. I think that's probably a coin toss.

Don't forget about what John said about worn plungers and barrels either. I don't want to agrue the point because he's worked on a lot more pumps than me... but I've seen them get to rather high hours with no trouble too. I've got one here that's still tight as a drum at over 7000 hours. It never makes much fuel in the cambox, but it's always down on oil due to a weeping drain plug...
I can't say that I've ever seen a Simms/Minimec make that much fuel that it comes out the overflow unless it's got lift pump trouble.

Rod

 

[jakey999]

Rod what the NS. imply, Nova Scotia?

 

[RodinNS]

yep, nova scotia...