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Fuel pump pressure regulator 3.8bar to 4bar?

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darrylrobert
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Fuel pump pressure regulator 3.8bar to 4bar?

Post by darrylrobert » Thu Mar 12, 2020 5:21 am

While i'm waiting for my temp sensor and thermostat to arrive i thought i might swap my spare 2002 xc70 fuel pump with my 2001 xc70.

First off the part numbers are different as the 2002 is a 2.5 engine and my 2001 is a 2.4, however they look very similar and i thought it would work but it doesnt. The car starts but cant get enough fuel to move it almost stalls. Checked the rail pressure and fuel is flowing out while car is running but shut engine off and no pressure. Will be removing tomorrow and re checking what has gone wrong (pump worked on parts car but that was 2 years ago) will also check bosch part numbers to see if pump is the same.

Fuel pump bucket had a small piece of aluminuim from a bottle of "injector cleaner" but clean otherwise
fuel pump.jpg
I took out the Fuel Pressure regulator which i suspect is malfunctioning when hot (pic) part no 0 280 160 620 (3.8bar). searched everywhere online and cant get part new, other parts look similar 0 280 160 575 (4bar) but no sizes are given.

would going from 3.8bar to 4bar fuel rail pressure be dangerous?

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abscate
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Re: Fuel pump pressure regulator 3.8bar to 4bar?

Post by abscate » Thu Mar 12, 2020 6:28 am

There was a big change in fuel delivery system right around 2001 to 2002 from the mechanically regulated pressure system (1999-2001?) to an electronically regulated system with a "PEM" or pump electronic module

The two are not compatible. These changes are region dependent so I don't know when it happened in AUS vs NA markets, but research that before spending a lot of time on potentially non-compatible parts
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jimmy57
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Re: Fuel pump pressure regulator 3.8bar to 4bar?

Post by jimmy57 » Thu Mar 12, 2020 7:42 am

The electronic fuel pressure control likely didn't affect AUS until late in 2000's. The fuel trims can handle a .2 bar fuel pressure increase. My fer is that fuel pump is the cause. They do fail and produce low fuel pressure. There is a check valve built into the pump and those get damaged from wear debris from pump and the ball no longer seals against its seat. That leaks away rest pressure. FPR cn leak the fuel also but since that isn't serviced the whole tank module is changed.

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darrylrobert
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Re: Fuel pump pressure regulator 3.8bar to 4bar?

Post by darrylrobert » Thu Mar 12, 2020 10:32 pm

thanks, turns out i broke one of the tube connecting port on the bucket, its really difficult to maneuver the float on the pump into that tiny opening. Is there a trick to it i found it near impossible, i really think the float is stuck under the bucket , so fuel pump side float may show empty when tank is full??...

anyway used the original bucket and hoses attached to the newer pump (same part number) and regulator car starts, just taking it for a test drive now.

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