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By ya self a mechanical gauge and hook it up to the first port and leave it under the hood.Mount it on ya HPOP bolt. (post #9) Put ya electronic on the second port. You will be able to see if ya electronic is faulty and it is a good indication if ya filter is getting clogged as well.
Got home from sea on Friday so here is an update on this tread I started.
Clay sent me a new sender unit while I was away and I put it in today.
Aaaand the result is; Bingo the ISSPRO sender unit was the culprit (defective)..
That was the second defect unit for me.
Put new one in and no more 100+ PSI .
As I had done all the fault finding steps itemised in the intial post on my thread, I still have the Silver Spring from the RiffRaff Fx, so the reading is a steady 56PSI at Idle.
I can only hope this Sender Unit lasts a lot longer than the original and the first replacement.
Cheers fellas for all the input and I hope it has helped others to fault find their fuel pressure issue .
There was another thread about this recently. I too have been thru many ISSPro fuel pressure senders. They are inaccurate and unreliable. I did buy a precise, reliable glycerin filled fuel pressure gauge from Northern Tool for $25. It is accurate and steady, but it is HUGE (4") and can only be mounted under the hood (not in cab.)
This is the sending unit I have......ISSPRO is sending me a new one as well. The R89145 are supposed to be better than the last units R89141 (black & brass). Hopefully it was just bad luck that mine went out........
Hanging around the 6.0 forum I have seen many guys run a hose from the "fuel bowl" area to one of the core support bolts, then mount their FP sending unit there. They report much better longevity for their sending units.
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