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Random Bloke

New Member

• Sep 11, 2012

• #1

Hi
My 2.5na is running unevenly and idling higher than normal (hunting?) but only when the tank is less than half full of fuel.
I have replaced the fuel filter, cleared the air hole in the top banjo bolt (it WAS blocked),checked the fuel cap vent, bled it at the injector & changed the air filter.
I have coped with this for over a year by keeping the tank full, when it runs perfectly.
I have made a long search of this site, but can find no further info’

Cheers

 

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digbymole

New Member

• Sep 11, 2012

• #2

have you checked the return pipe ?

 

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Random Bloke

New Member

• Sep 11, 2012

• #3

No
I`ll blow it out in the morning
What the best way ?

cheers

 

The Mad Hat Man

Well-Known Member

LZIR Despatch Agent

• Sep 11, 2012

• #4

Semtex

 

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digbymole

New Member

• Sep 11, 2012

• #5

air compressor if you aint got one of em then your gob around it and a set of elephant lungs would help lol !!!!!!

 

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Random Bloke

New Member

• Sep 11, 2012

• #6

I mean where is the best point to blow it from ,it all looks push fit (or push NOT fit, as is most often the case)
Is it not under pressure?

 

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digbymole

New Member

• Sep 11, 2012

• #7

engine side buddy its easier !!!

 

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Random Bloke

New Member

• Sep 12, 2012

• #8

Blew out the return (but did not bleed) – same problem. Took out the fuel lift pipe (?) from the tank cleaned it & stirred up the sediment in the recess it sits in, bled the system & ....... SORTED
I`m unsure what sorted it, but a post on this site pointed out that when the tank gets empty & sloshes about, some air is taken up to the filter where it returns through a small hole in the top banjo bolt (mine was blocked) through the return pipe(may have been blocked) & back to the tank.
Thanks to Digbymole for taking the time
Mad hat man ..... Whilst I`m sure a small explosion would produce enough air pressure to clear the pipe, I see lots of safety/legal problems with your suggestion, so did not proceed.
Cheers everyone.

ONE LIFE....... spend it driving stupid macho vehicles.

 

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Random Bloke

New Member

• Sep 29, 2012

• #9

Or rather NOT sorted........Changed the fuel lift pump & TOTALY SORTED, maybe got weak, full tank is less to lift.
FYI early 2.5na ninetys have the same pump as S3

 

Last edited: Sep 29, 2012

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radio05

Member

• Nov 9, 2012

• #10

thought so.. I had nearly the same fault with a Chevrolet petrol car, the fuel pump would sound noisy, and the car would stall out at random with under a half tank. Changing the pump sorted it out.