As Ive mentioned a week or so ago...I have a Impco CA 50 Carby and a
Mod J evaporator on my forklift.
It has a seperate tube to engage the "lockout:" part of the
evaporator..IE..if there is suction on the seperate tube...it then
feeds propane to the carby.
I discovered today..that if I push and HOLD the "primer" button..it
will run just fine.
So that lead me to think the "lockout" part of the evaporator was not
So I sucked on the hose..and nothing happened. HOWEVER....If I BLOW in
the hose (just a few pounds..and no smart comments here
thankyouveddymuch!!)..it delivers propane to the carby and it runs
What the fuck?????
I can detect little or no suction at the "lockout" tube attachment on
the carby...and no blow either. I do have good suction at the
entrance to the carby while its cranking.......
What the fuck (again)????
Do I have a problem with the evaporator..or the carby?
No suction noted by finger tip on the suction line at the carby.
All the seals and diaphrams are ok, with no leaks noted. Both the
carby and the evaporator appear to be nominal...visually.
Is there a way I can bypass the "lockout" portion of the evaporator
and simply run it that way? I do have a 12 solenoid that I can add to
shut off the fuel in case I leave the tank turned on over night.
Im rather lost here.....which since the stroke..is something Ive had
some experience with..damnit.....
The diaprhram on the inside of the rear cover on the Mod J has a
triangular bit of sheet steel attached to it. It rocks on a piviot
point on the rear cover and pushes down on a spring loaded valve. This
bit of triangular steel was bent over the pivot point. All the
diagrams show it to be flat..so I carefuly flattened it out before
discovering the above data..but yesterday it DID run with the primer
button depressed.....if that helps in the diagnosis.
Over the years...Its gotten worse and worse...I had to prime it (push
the button) to start it..often several times before it would fire up
and run ..so I suspect this is part of that ongoing issue. Ive seen
few forklifts be a problem to start on propane when there was good
compression and good spark.
This thing only has less than 1800 hrs on the Hobbs meter...but it was
made..I think..in the early 90s.
- posted 9 years ago