Fuel filter problems again

[julianf]

ps.

ive changed the lift pump on an, otherwise, known good setup before, and had an issue getting the olives to seal



thinking about it....

if you have a leak post lift pump, then it will be diesel comming out, rather than air going in, surely?

[Julian]

OK, it's here waiting for you.

Only condition is that I have the old one in exchange ... it's part of a long term (very long term) heated filter project.

It's been a while since I stuck my head under the bonnet but isn't the fuel filter on the pressure side of the lift pump?  If you get air from the bleed screw, there must be pressure in there to push the air out.

[Head Womble]

thinking about it....

if you have a leak post lift pump, then it will be diesel comming out, rather than air going in, surely?

That is exactly how I saw it and it's bugging me as to why it's doing what it is.

Only if the filter was very badly blocked should you get air being sucked in at / or after the filter.

Maybe I should put on yet another filter and see how I go now the rest of the system is sealed.

[Head Womble]

OK, it's here waiting for you.

Only condition is that I have the old one in exchange ... it's part of a long term (very long term) heated filter project.

It's been a while since I stuck my head under the bonnet but isn't the fuel filter on the pressure side of the lift pump?  If you get air from the bleed screw, there must be pressure in there to push the air out.

Yes air is pushed out from the bleed screw (after the lift pump) and mine is still doing this, I'll try a new filter before robbing you of a housing.

[julianf]

My money is on the olive on the suction side of the lift pump.

[Head Womble]

A new filter and tightening up all the olives done the trick (for now).

It's now running 50/50 veg/dino (soon to be 100%), time to fit the LPHE that Julian gave me some time ago.

Thanks for you help guys.

[oakwoodtv]

What's a LPHE ?.

[Head Womble]

It's, a, um, a, er, flat plate heat exchanger