Does anyone know how far away from the fuel tank you can get away with putting an electric fuel pump (Probably Facet Posi-Flow).

Sales bumph just says as close to the tank as possible and no higher than 12 inches above base of fuel tank. If I'm mounting it on the floor could I get away with a slightly longer run from the tank?

Cheers

hey paul, mine is at the back of the fug, about 2 foot from the nearest carb, works a treat, its just a simple flow and return system........also its a tad higher than the base of the tank, by about 8-10 inches.

my pump is just like this one:

http://cgi.ebay.co.uk/bek114-MGB-C-ELECTRO...1QQcmdZViewItem

they seem to be popular on MGB's for some reason


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My guess is mounting above the fuel is the limiting factor. I would imagine if mounting it on the floor means your going below tank level you could mount the pump a long way from the tank, as long as the fuel lines arn't too restrictive, what's the difference, especially with gravity on it's side?

Hmmm....

I was hoping that by running a low pressure electric pump (1.5 to 4.0psi for the one I looked at) that I could get away without the fuel return?

This was on the theory that the float valve can hold around 7 psi.

I was hoping to avoid having the return feed to the tank as don't have one currently and want to minimise stuff running up the cars length.

Will that work?

p.s. If I've got totally confused let me know - fuel side of things is new to me!

I could be wrong here, but I think there are some pumps designed to have a return, mostly higher pressure fuel injection, & some not, like older carbed cars for example.
Talk to the pump supplier?

I'm guessing it would work ok with or without a return, return would be nice though. An electric fuel pump will easily empty a whole fuel tank into cans in minutes, even though the pump would be feet above the tank, principle is there. I've come across things in the past, as all of us on here will of when building things, manufacturers and suppliers will seldom know or be willing to tell us what stuff can really do what.
I had a real problem finding out how to plumb in the header tank for my rad once I'd put it higher than the top of the engine, I tried numerous radiator manufacturers and no one said they had any reason to know as it had never come up that anyone wanted to plumb a Mondeo rad to a Lancia engine. I even asked on this forum and drew a blank, took me ages to work it out, then it was obvious, I should have figured it in minutes, but couldn't. What I mean is, the rad could have ended in tears the fuel pump idea you have will either work or it won't. The company it came from won't be able to tell you, I'm sure of that, but try it, it can do no damage.

100 bob - expansion tank placement is simple, it needs to be marginally higher, say 6 inches, than the highest piece of coolant in either the cylinder head or the top of the rad.......if you ever have any engine worries please just ask here - sorry to blow my own trumpet but I design engines for a living. :ph43r:

I did ask on forum, and you did answer me, I could tell you were unkeen on my choice of radiator position in both it's appearance and potential risk of cooking the engine, but stubborn as I am I continued. The appearance I can cope with as I feel it goes with the whole look, cooling is perfect. I was to be truthful frightened to position rad behind engine due to it's vulnerability during a "car park nudge" and restricted airflow, not to mention only air it would get would be hot anyway. I personally see that as a higher risk, that said, I'm basically just a hobby mechanic. It wasn't just the concept of a header being higher than the rad, it was the entire plumbing, there's quite a lot of inlets and outlets on my system. (See "Radiator Positioning" need an opinion, posted 29th June 06.)

no problem bob, funny you should mention radiators, someone nudged into mine and burst it.......just kidding :P .......but seriously, I have come to the conclusion that it dosent matter where you put the rad, but it absolutley must feature a duct to force the air through, otherwise the air just takes the easiest path and gos round the side.......I was only running one 9" fan on mine and itsgot a little too warm on the motorway last week, so now have two 9" fans, and I'm going to duct the lower section properly........but two fans works great