Thread: Premature in line fuel pump failure

Here is the GE043 (I think) pump installed with an inline metal filter/screen. The rubber came off the original LR part but is now removed to have both clamps on it and the wire tucked away. I had to trim the ends of the existing hoses to fit the filter in there too, that i wasn't happy about but an original pump could go back in as there is a bit of play in the amount they can move.

So far so good with a original filter change too. No noise coming from the unit, and a 24month warranty.

Originally Posted by harlie

I thought you said up the top that the car would fail to start?

Yes but still no fault logged on the computer.

Originally Posted by harlie

I don't believe it will. The inline supplies fuel through the filter to the high pressure pump at pressure, it's not much (I think about 60psi?) but it is significantly higher than the intank will produce. There is a pressure switch on top of the fuel filter that monitors low side pressure and if it is not enough the engine ECU will not allow the engine to run, it's to protect the high fuel pump.

Hey Harlie,

"The low pressure system pressure is approx. 1.5 bar to 5 bar and return end < 0.6 bar. The pressure in the high pressure end is 200 bar to 1350 bar."

"Fuel Filter
...........
Incorporated into the fuel filter is a fuel pressure sensor. This sensor measures the pressure of the fuel being delivered
to the high pressure fuel pump. This enables the ECM to reduce the fuel injection quantity at excessively low inlet
pressures to the point where engine speed and rail pressure are reduced accordingly. The volume required at the inlet
of the high pressure pump is reduced. This makes it possible for the inlet pressure to the high pressure pump to rise
back to the required level.
At an inlet pressure of < 1.5 bar, the high pressure pump can be damaged due to inadequate fill.
Another pump protection feature is that should the inlet pressure difference between the inlet and the return fuel lines
≤ 0.5 bar develops the engine can stall suddenly."

Poor performance is the result of inadequate fuel pressure at the sensor. The pump in the tank has enough pressure for duel delivery under normal driving conditions and the engine will only stall when "the inlet pressure difference between the inlet and the return fuel lines
≤ 0.5 bar".

I saw a farmers truck with 5 filters with one high pressure pump and one low pressure and it worked fine. When my inline pump dies I will give it a proper go to see if it works with out any issues, however, going of the evidence in this discussion and in the publication with regards to a faulty / inop inline pump I would say it works, with the potential of power loss or high pressure fuel pump damage.

Originally Posted by chaybra

Here is the GE043 (I think) pump installed with an inline metal filter/screen. The rubber came off the original LR part but is now removed to have both clamps on it and the wire tucked away. I had to trim the ends of the existing hoses to fit the filter in there too, that i wasn't happy about but an original pump could go back in as there is a bit of play in the amount they can move.

So far so good with a original filter change too. No noise coming from the unit, and a 24month warranty.

SICK!!