You're right, That's why I had to dissasamble T case.
One of those Washers Fall inside, when i'have done It.
If you stop When you see the ring, no problem...
There is a O ring on that shaft.
It is easy to replace it.
Just unscrew the bolt, Remove the Key, pull back the shaft a little bit (stop when you could see the ring) and replace that ring.
But becareful, not to pull back the shaft too much.
Because there is a other O ring on that shaft betwen...
If your air clcleaner isn't plugged. It is a problem of mixture air/fuel.
Here in France some BJ owner with inline pump had same problems.
Pretty simple, The diaphragm was cracked, so air/fuel ratio wasn't good.
I'have check toyota 2h/12Ht engine repair manual.
You are right :whoops:.There is nothing about pump pressure.
Only fuel quantity with pump RPM on the bench.
The HAC is supposed to drop down fuel flow on injection pump at high altitude.
Without HAC your engine will smoke a lot at high altitude.
This system is only for non turbo toyota diesel engine.
Turbo engine are less subject to smoke at high altitube.
1. 1988 Hj 61 turbo diesel direct injected
2. EHRHARDT sébastien from France
3. The "rusted bus"
4. 330000 Km
5. modificatiion : 32*11.5R15 maxxis A/T, home made Stainless stell exhaust
, Rear Body rust remouval, home made aluminium gallery , Home made fiberglass snorkel, webasto diesel...