Originally Posted by undercutter
The check valves should be in the supply and return ports
of the injector pump. They may look like adaptors. The screen
should be in the seat of the supply port below the check valve. You should never have to dismount the injector pump to service
Never dismount this pump without putting the engine in the timing position first.
You will be right about some engines but e.g. on small VP engines the valve is in the pump body
. Most all small VP engines have one pump which may be something built by Johnson or Perkins
or whoever built the engine actually.
I have a big perkins
too but not at hand, I can't check how they solved
So, in some cases, the valve is in the pump body ;-(
As for timing on small engines - you can turn the engine by hand even if it stopped in the 'wrong' position. On bigger engines - you can check how the 'lever' (it is an oval gear) is positioned by manually priming first - it is safe to take the pump off if you can easily manually prime the pump. (This implies the gear
in the engine is at its lower position).
A word of caution is if any of the lines is a hard (metal) line then be very cautious when connecting to the pump after repair - I did see a hard fuel
line connector cross threaded into a soft alloy body of the pump by a zealous ignorant mechanic
- ended up in a dangerous leak and a new pump needed ;-( So, re-connect carefully and without forcing anything.
In our boat the out line is rubber too, now (modified some time back).