42 replies to this topic

[Spitz]

Each of my cars have mechanical pumps. All but one have the fuel line coming behind the manifold and up. Came from the factory like this!
Now they have LCB's on...and yes, the fuel line is still behind the centre branch. It's about a good inch away.
I auto cross the one car and has had the same set-up for several years......it's fine.
Go ahead...wrap your exhaust ( I may try it one day actually ) but if the factory thought it was OK to run the fuel line back there...I think you're OK ( yes a centre branch is a little closer...but you can bend the fuel line away a little more )

[maggies_minder]

they (rover and all its predecessors) have got to be the only car company in the world who didnt think it was a good idea to reposition the fuel lines from behind the exhaust manifold.

wonder why they went bust?

[JustSteve]

play russian roulette Martin you play that game with alot of your customers to be honest i wouldn't take your advice even if its free you chat alot of crap! and treat people very disrespectly

petrol dose not explode or cause the damage that martin is on about i have check with mechanics and engineers with in the race and motor trade today and they all said its complete and utter balls as a Nature asprated engine can NOT cause this level of damage.


Also if it is a problem it will be picked up on an MOT test that what the mot test is for to check if the car is unsafe just get the exhaust heat wraped or reroute the system but you have one in a billion chance of anything going wrong to be honest!! ive know of one mini to catch fire in the years i have been working with them and thats cause the master cylinder blown a pipe off it under heavy braking and the brake fuild hit the exhaust setting fire to it and this engine was turboed aswell

I've never dealt with martin myself, but I've never seen him say anything bad about anybody! As for his advice... it'd probably about the best you're going to get!

Now you're talking crap, petrol will ignite under heat, although highly unlikely that it will, it's called an accident for a reason! is your life and possibly others worth the risk?

Never known an MOT inspector check how close fuel lines are to the exhaust... worked in a couple of different garages on-and-off.




Now, at the end of the day we all have opinions, and there is no right/wrong choice, but it's the OP's choice to make, and I'm sure he'l do the right thing.

Steve

[jaydee]

they (rover and all its predecessors) have got to be the only car company in the world who didnt think it was a good idea to reposition the fuel lines from behind the exhaust manifold.

wonder why they went bust?

I hope you will never put your hands on a 'real' fiat 500 because you'll find something worse..
and many other car companies still have massive overheating issues in their modern cars..

That said I really dont want to justify the bmc odd choice.

[MRA]

Petrol does not need a spark if your manifold is hot enough, ie glowing after a hard run........ and as the pipe and pump are far too close there will be thermal damage that eventually lead to a leak

And yes its the vapours that will ignite.................

but a mainfold on a N/A will not get hot enough to cause the damage and distruction you are on about as there's no air being forced it to up the tempture if it was a turbo or supercharged unit then it will

An exhaust manifold on an NA engine can get to ignition temperatures quite easily, especially after a long high speed or high load run, or more so if for instance the ignition is retarded.

Its not about how often this fault will occur it is about reducing the chance or preferably avoiding the situation completely.....

[leroy26]

^^^ that's what I'm trying to do!
so my plan is, I've brought some stainless braided hose and a some flexable heat shield that is going to be wraped around this hose and the mechanical fuel pump. I'm going to run the hose up behind the carb and connect it that way!
the closest thing to the manifold then is the fuel pump which is 1 3/4 inch away!
thatway I should minamise the risk of anything happening
thanks guys for your thurts

[dean.austin]

yes that is a good idea the hoses the good and last for ever

[charliedurrant]

I have a LCB exhaust manifold and the standard mechanical fuel pump. The fuel line was routed around the manifold (inside some plastic trunking) so I just routed it back on itself to the right of the engine bay behind some other pipes and then back round the front to the carb. The manifold was heat wrapped but it seemed daft to have fuel any where near something above 100^oC.

I'm with MRA on this. I wouldn't heat up a petrol tank with a heat gun - I'd probably loose my nerve!

Charlie

[leroy26]

well I've moved it so it's a inch and half away all the way round as it was it was 5 mm!

[charliedurrant]

An inch and a half is easily enough clearance.

[leroy26]

sooooo glad someone said that!

[mini93]

if your still a little worried, you can get some heat proof over cover for lines

http://www.demon-twe...leeve/1471/6767

[leroy26]

done!!! thanks