Rosco
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| posted on 27/2/09 at 01:49 PM |
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Fuel Pump Location
On my Fury I've mounted the electric fuel pump and filter on a small alloy bracket / shelf just below the fuel tank. It's flush with the
car floor and bracket hangs off the rear of the chassis just behind the diff.
I thought this was quite a smart installation being below the tank yet protected from road debris. However, the body was delivered today and part of
the rear tub which curves under the rear of the car, below the lights, number plate and fuel tank appears to clash with my fuel pump installation.
So I guess I have the choice of either cutting the body or relocating the fuel pump and filter.
I don't really want to cut the body but can't see where else to fit the pump to keep it below the fuel tank drain.
What do others do? Does it need to be below the tank drain?
Thanks.
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Dangle_kt
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| posted on 27/2/09 at 01:55 PM |
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nope, its a pump, as long as its got a good seal it could suck that tank dry from 10 foot up.
[Edited on 27/2/09 by Dangle_kt]
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02GF74
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| posted on 27/2/09 at 02:01 PM |
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quote:
Originally posted by Rosco
Does it need to be below the tank drain?
No.
There are two types of pump; push and pull (suction type).
The former are mounted low as they push the fuel upwards, the latter higher up as they are able to "suck" fuel up.
You would need to identify what tytpe yolurs is and mount it accordingly, in practise I doubt there will be any issues if you mount it a bit higher to
clear body work.
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Mr Whippy
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| posted on 27/2/09 at 02:02 PM |
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as above, yet to come across an external fuel pump that doesn't self prime
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cd.thomson
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| posted on 27/2/09 at 02:08 PM |
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I might be wrong of course but I was under the impression that pumps for carb'd applications sucked well and so could be mounted above the level
of the output on the fuel tank whereas high pressure pumps need to be gravity fed?
http://www.grahamgoode.com/pump.htm
Craig
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britishtrident
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| posted on 27/2/09 at 02:28 PM |
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I'll try and clear up a few misconnceptions, The so called SU suction fuel pumps such as those fitted to the Morris Minor under the bonnet only
differed from those fitted at the rear on cars such as the early Mk1 Mini in that the spring was weaker --- ie the delivery pressure was less.
The very best place for any pump is in cool place low down and near the tank.
If the pump has to draw fuel upwards there is the possibillity that a vapour lock will form especially in hot weather and low fuel levels.
The pump dosen't have to be below tank level as long as it is no more that 300-400 mm above the bottom of the tank.
However some pumps on classic car models with fuel injection must be fitted below tank level.
[Edited on 27/2/09 by britishtrident]
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BenB
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| posted on 27/2/09 at 02:43 PM |
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I've got my fuel pump higher than the top of the tank and in the engine bay. That's quick some suction. And it's only a tiddly
little bike engine fuel pump.
No problems with underfuelling......
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whitestu
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| posted on 27/2/09 at 03:27 PM |
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Like Ben, my ZX6R pump is in the engine bay at the top, and works fine.
Stu
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britishtrident
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| posted on 27/2/09 at 04:50 PM |
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Problems tend to arise in hot weather pumping warm petrol isn't like pumping water --- petrol flashes off to vapour.
Just ask a Tr6 owner about vapour locks in the fuel system.
[Edited on 27/2/09 by britishtrident]
[I] What use our work, Bennet, if we cannot care for those we love? .
― From BBC TV/Amazon's Ripper Street.
[/I]
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garyo
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| posted on 4/3/09 at 11:27 AM |
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So it it safe to say you can mount a modern EFI high pressure pump with the bottom of the pump level with the bottom of the tank, without too much
risk of starvation problems? i.e. when there might only be an inch of fuel in the bottom of the tank so gravity will only bring the fuel level to
half way up the pump body?
Gary
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cd.thomson
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| posted on 4/3/09 at 11:46 AM |
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Yes I would say you were in the safe zone there, its not like a water fountain pump which needs to be fully submerged.. let me see if i can find a
picture of mine...
http://redtoprush.blogspot.com/2009/02/rear-fuel-gubbins-20109.html
sorry its not very clear.
Craig
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Mix
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| posted on 4/3/09 at 04:36 PM |
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Hi
Most if not all fuel pumps are lubricated by the fuel they are pumping, if a pump is repeatedly having to prime itself it will suffer accelerated wear
and early failure.
Another point to consider on the location of the pump is the length of pressurised fuel line available to spray fuel should it develope a fault, pump
at opposite end of the car to engine = lots of pressurised fuel line, pump in engine bay = considerably less.
My current plan is to put the pump in the engine bay below the level of the bottom of the fuel tank, (though I'm open to advice).
Regards Mick
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DIY Si
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| posted on 4/3/09 at 06:26 PM |
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Whilst what everyone has said it correct, in a car so small, as long as you don't take the wee, it won't matter a monkey's where you
put it really! Mine is above the tank, and pushes fuel down to front via a single run of pipe. If the copper pipe leaks I'll be amazed. Others
have the pump pulling all the way from the back. I don't know of anyone suffering from fuel starvation.
Let your plans be dark and as impenetratable as night, and when you move, fall like a thunderbolt.
Sun Tzu, The Art of War
My new blog: http://spritecave.blogspot.co.uk/
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