ridiculous question

[jackal]

will prolly sound silly but here goes.... once ive tightened main fuel lines up (ones that go into the fuel rail) .. how do I know they wont come undone again and spray petrol all over my engine causing a huge fire/pile up on the M25 ?

are they sort of designed to not come undone ?

[Snake the Sniper]

Friction, mainly. It's the same reason your brake lines don't fall apart really, not much more to it than that.

[theshrew]

Yeah thats a stupid question

[theshrew]

Yeah thats a stupid question

[Steve_D]

Posting twice is just rubbing his nose in it.

Steve

[jackal]

theshrew said:

Yeah thats a stupid question

yep, i know that thanks... clearly I wasn't looking for coroboartion of that very fact


and welcome to pistonheads by the way

[SlipStream77]

Sounded pretty sensible to me.

[Snake the Sniper]

SlipStream77 said:

Sounded pretty sensible to me.

Indeed. The only stupid question is the one you don't ask. Especially when it comes to fuel lines!

[theshrew]

Sorry i didnt mean to post twice.

Just check if anything is leaking if it is you will be able to tell

[annodomini2]

Silly question, does it use clips or screw fittings?

[dmitsi]

Use the right torque and bob is your mothers brother. Shouldn't really fit the same FIE more than three times or you may start leaking.

[oakdale]

If you mean screw fittings, just put a blob of paint on after fitting them, then you can check visually if they move. (which is unlikely)

[deetes]

jackal said:

will prolly sound silly but here goes.... once ive tightened main fuel lines up (ones that go into the fuel rail) .. how do I know they wont come undone again and spray petrol all over my engine causing a huge fire/pile up on the M25 ?

are they sort of designed to not come undone ?

There are NO stupid questions, only stupid answers.

Chinese proverb!!!!!

[Mr POD]

oakdale said:

If you mean screw fittings, just put a blob of paint on after fitting them, then you can check visually if they move. (which is unlikely)

Indeed, that's standard automotive practice to 'record' that the bolt is torqued up correctly. Paint pens in Sensed pots with the assembly (brake of turbo or whatever) locked in to the fixture until the pen is seen to be removed. Tipex works okay too.

[jackal]

ok thanks

what is 'sensed pots' ?

[annodomini2]

If it is screw fit, are there any threadlockers that are compatible?

[oakdale]

I wouldn't recommend going anywhere near fuel systems with thread locking fluids.

[annodomini2]

oakdale said:

I wouldn't recommend going anywhere near fuel systems with thread locking fluids.

Could you elaborate a little more please?

Is it more along the lines of:

A: The threadlocker is eaten by the fuel?

Or

B: The threadlocker compromises the fuel?

Or Both

[jackal]

annodomini2 said:

oakdale said:

I wouldn't recommend going anywhere near fuel systems with thread locking fluids.

Could you elaborate a little more please?

Is it more along the lines of:

A: The threadlocker is eaten by the fuel?

Or

B: The threadlocker compromises the fuel?

Or Both

i havent used threadlock (see my seaparte post on that )

but having said that, my fuel hoses have a sort of cup at the end which presumably tightens against the concave shape on the fuel rail connection. So I woulnd't think anything on teh thread could get into teh fuel system and vice versa... if it could then the connection is bust.

[oakdale]

jackal said:

annodomini2 said:

oakdale said:

I wouldn't recommend going anywhere near fuel systems with thread locking fluids.

Could you elaborate a little more please?

Is it more along the lines of:

A: The threadlocker is eaten by the fuel?

Or

B: The threadlocker compromises the fuel?

Or Both

i havent used threadlock (see my seaparte post on that )

but having said that, my fuel hoses have a sort of cup at the end which presumably tightens against the concave shape on the fuel rail connection. So I woulnd't think anything on teh thread could get into teh fuel system and vice versa... if it could then the connection is bust.

It's just not good practise, thread lock sets when it is confined in a small space with no air present, just the conditions present in a fuel injector or float valve.

Even a minute amount can ruin an injector, I've seen it happen.
And as a properly tightened joint will not come loose, It's not worth the risk