1hz fuel pump problems at higher rpms

[thebokworm]

Hello,

A few months ago I was driving my 1hzj80 at highway speeds (110km/hr) and it lost most of its power, main tank pre filter had blocked up, changed main fuel filter as well. Power wasnt at its previous standards to before, got the vehicle dyno tuned and it was working great, till I parked it on a hill at work(happens all the time, nose of car being highest point) and now its gone back to not getting enough fuel at higher rpms again. Checked main tank pre filter again, is clear, adjusted the fuel screw on injector pump to let more fuel through, helped a very little amount. Is there another pump/filter that could block up and stop fuel flow. Does it sound like the injector pump is due for a rebuild?

feedback is greatly appreciated
cheers

 

[1TonLC80]

Perhaps your lift pump has gone out? And/or a partially clogged fuel line

 

[thebokworm]

Perhaps your lift pump has gone out? And/or a partially clogged fuel line

Where is the lift pump located, roughly
It does get better when the fuel tank is above the engine

I have been search and cannot find if the 80 series has a lift pump, is it in the tank?

 

[mudgudgeon]

Where is the lift pump located, roughly
It does get better when the fuel tank is above the engine

I have been search and cannot find if the 80 series has a lift pump, is it in the tank?

Its part of the main fuel pump.

Have you tested for air in the fuel system? Air bubbles in the fuel will cause issues.
Use a clear hose between the filter assembly and the fuel pump to check for air getting into the fuel.

There's heaps of threads about this in the diesel tech section