i have brought a mondeo fuel pump unit off ebay. its the sort thats is in the tank.
i know its a daft question, but im very worried about having petrol and electrics in such close proximities...
are they safe? do i liturally fit it to the top of my ali tank ( making sure i have adapted it for the right depth )
never seen a mondeo burst into flames yet.
It's a good question but without being pedantic, if the majority of car (and motorbike) manufacturers use this way of doing things it has to be
safe. Just make sure you insulate any connections you make with something petrol proof.
its funny how you get electrics in fuel tanks lol
(why dont they go bang?)
Non combustable mixture. its safe as houses.
While the fuel is in liquid form it wont ignite, when it turns to vapour it will, inside the pump the conditions for combustion do not exist.
something like that.
Steve.
[Edited on 1/6/07 by stevec]
I think it goes something like this...
You need both oxygen and fuel plus a spark to create an explosion and in a fuel tank you don't have very much oxygen due to the density of the
fuel vapour.
It does kinda go against your intuition though doesn't it? 
Cheers,
Craig.
It's one of those things that you just don't want to trust. But nothing can ignite without oxygen.
i know, i kepe telling myself its safe - all the cars i have driven in the last 4 years ( fiesta, escort, focus ) all have in tank pumps, its just when you take it out and look at it, with the exposed fuel lever sender tracks, you cant help but think that all it needs is a spark!!!
I have one in my car, and so far no problem. Ray
Not a problem.
Only comment I would make (and stands whether you have an in tank pump or not) is make sure a metal tank is well grounded to the chassis.
you'll soon know if it doesn't work.....................BOOOOOOOMMM!!!!!!! 
Petrol doesn't conduct like water does
I seem to remember that the Apollo 13 service module had an electric motor in an oxygen tank to stir it.
Why worry? just put it in, drop a couple of litres of petrol in, switch on and it will either work or you won't know a thing about it. . . . .
Caber
quote:
Why worry? just put it in, drop a couple of litres of petrol in, switch on and it will either work or you won't know a thing about it. . . . .
daft question, but does the tank have to be connected to ground?