Return fuel pipes?

landy-lee said:

Hi all

I know the fuel feed to the pump needs to be 8mm but can i also use 8mm for the return line to?

It should be 6mm but i can't see why i can't use 8mm unless it needs 6mm for back pressure or something i don't understand.

I just think it would be easier to do the lot the same.


Cheers landy lee

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lynall said:

I would check your sizes as 8mm sounds small to me?

As a general rule flex hose (ie rubber) is measured id internally, rigid pipe incl nylon is measured od externally.

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landy-lee said:

My 300tdi had 8mm id feed and 6mm id return

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Hicap phill said:

Think There is a restriction some where. It’s in 1 of the fitting.

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lynall said:

Its in the fip return banjo, Iirc it keeps the fip pressure at 70psi, madly that one banjo is the best part of 40 quid!

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landy-lee said:

Arrr ok so i believe using the same pipe for feed and return will be ok as the banjo has a pressure valve type thingy in it.

Cheers mate every day is a school day!

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