whiney fuel pump and i've changed it!!!!.. and lift pump...

[PeteG40]

right, fuel pump started to whines like an RC car, so got  a second hand one off dan barnes and swapped it. I also cleaned the filter on the intank pump.

It still whines!!!

what do people reckon it is???  fuel filter need changing?

[scotsjohn]

A safe bet Pete, but what sort of mileage on it? My first filter change was at 165k on my old G.

[hayesey]

what about the lift pump?  If that's worn out maybe the inline one is struggling

[dannyb.G40]

i changed the inline one and it didn't fix anything, turned out to be the lift pump as hayesey said

[PeteG40]

fuel filter has been replaced and looks quite new. I shall investigate the lift pump. It only does it on occasions, but embarrassing at the very least at traffic lights!

[PeteG40]

right, changed lift pump and it still whines.

I'll change the filter tomorrow... but other than than, what can it be??? would a dodgy FPR cause the pump to overwork? it does seem to get warm when whiiiiiiiiiiiiiiiiiirrrrrrrrrrrrrrrrring and whining

[scotsjohn]

Any chance of a kink or crimp in the fuel line while doing other work? Return pipe blockage?

[PeteG40]

i'll check connections in the engine bay... its weird as its only really bad stood/at idle.

1. Pipes in engine bay
2. fuel pressure reg
3. fuel filter

hopefully get to the bottom of it!

[scotsjohn]

At it's worst with least demand; starts to sound like the regulator.

[PeteG40]

i've got a few regs about... will check pipes and reg tonight..

fingers crossed will get to the bottom of this.

[PeteG40]

pipes seem ok, regulator changed... now seems to behave... but  not had a good test. Will test and report back.

pete

[Dan]

Interesting that regs do that. Not heard it happen before, but would make sense.

[PeteG40]

only thing i can think is that the reg wasn't letting it return to the tank and therefore backing up and straining the pump