Update:
The
vacuum light from the fuel filter still comes on. AND its is actually a vacuum in the filter incurring. I dove like that 1000 miles with no problem, starting, power was ok, high speed easy over 80 mph.
BUT recently after I drove my truck 10 miles. (changed coolant) started and
run 15 seconds - and then died. After some try and error. finally
the main fuel filter was only half full. Hardi Pump -ok.
It´s a 1993 7.3 N/A, 100k. Most parts new [IP redone Advance piston, Injectors redone, GP new, GP relais new, GP "Computer" new, Electric fuel pump new, fuel lines from frame to top, no air leaks].
After all air was out of the system, truck ran as good as usual. But light comes on again and again.
I spoke with the German manufacturer [Hardi el. fuel pump] and the pump is fitted and installed correct.
The "original" pump the truck was equipped when bought is an facet:
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The facet was shot, once. It produces ~ 5- 7 PSI - a
facet posi flow EFP -3. I don´t know how much flow. Should be a very old one.
As I live in Germany I don´t want to rely on simple parts that can NOT be purchased locally, if possible. As far as I can remember (in early 2015) this facet is a simple ~ 50$ pump w/o an amazing flow.
So I bought this pump: This manufacturer has a very good reputation in Germany:
https://www.hardi-automotive.com/produkt/kraftstoffpumpe-10012-6v-12v-ab-100ps/
HARDI fuel pump 10012-6V [product name]
Delivery rate: 100-130 / h
Pressure in bar: 0.28-0.35 [- 5 PSI]
Starting voltage: 8.5-9.5V
Rated voltage: 12V
Current consumption: 1.5-1.9A
Suction height: approx. 1,5mtr.
Weight: 1000g
Neck: 10mm
splash-proof, suitable for motors over 100hp
this should be suffisant flow at least for no load on the IP. But it isn´t.
The pump is - like the old facet - electrically connected to the GP relais. It is the small red wire at the left lower corner:
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This plug has power as soon as the GP system starts. So from right before start. And also while running, as far as I have [multimeter] testet after the recent failure. The Hardi pump starts already at low voltage from ~9 volt onwards.
I really don´t want a mechanical pump again. Having had so many problems with the system in total
I want the easy way to transmit fuel w/o engine running. And also it is impossible to get one cheap. Shipping form the US is always + ~ 100$.
We all know that fuel translates into power in a diesel engine. So I don´t want to give this up of course. But I doubt that this is - at least the only - issue.
I once med a Canadian Mechanic (actually an engineer) who repaired my pump in no time (40 minutes). Before, he did a diagnostic via telephone! and was right. An amazing guy - but I think he moved back to Canada :-(
He gave me a lot of advises. One was something
like put this 10 mm steel ball inside a return line. It is 10 months ago and I had other issues at the time, so I am not 100% on that.
This could make sense to me if it is the
return line from the filter - which I guess he meant. This return line is supposed to send back fuel
if the pumps get´s more than it needs. This is obviously NOT the case but could cause issues IF and in the long run.
- Doesn´t the DB2 by itself has an return line for that? I´ll check the Stanadyne document for that....
- Is there something like a valve opening the return line at the filter housing for overflowing? IF this is permanently open, pressure cannot be enough, eventually.