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Rear Mounted Fuel Fillers
davidimurray - 31/1/14 at 02:04 PM

My fuel filler is on the back of the my car and as is typical I have to dribble the fuel in to stop the petrol pump clicking off. Looking under the wifes car the other day I noticed two pipes from the fuel filler, one is the actual fuel filling line, the other comes back from the tank and joins the main fuel filler right at the top. Is this a vent to stop the pump clicking off?? Could the same be done with our cars, i.e. install a vent line from the tank back to the top of the filler (higher up than where the end of the petrol nozzle sits). Anyone tried this?

PAUL FISHER - 31/1/14 at 02:28 PM

Yes Westfield do, all there tanks come with a one way vent valve fitted in the top corner of the tank.

[Edited on 19/05/04 by PAUL FISHER]

davidimurray - 31/1/14 at 02:50 PM

quote:
Originally posted by PAUL FISHER
Yes Westfield do, all there tanks come with a one way vent valve fitted in the top corner of the tank.

[Edited on 19/05/04 by PAUL FISHER]


Is that a 'proper' full size vent though that will take the full inlet flow of a petrol pump or just a small tank vent? I have a little 3 way vent valve in my tank, but with only a 4mm bore pipe on it it will never relieve a tank while being filled. At a guess is solely reliant on the vent it would need to pass about 40l/min.

[Edited on 31/1/14 by davidimurray]

Slimy38 - 31/1/14 at 02:58 PM

quote:
Originally posted by davidimurray

Is that a 'proper' full size vent though that will take the full inlet flow of a petrol pump or just a small tank vent? I have a little 3 way vent valve in my tank, but with only a 4mm bore pipe on it it will never relieve a tank while being filled. At a guess is solely reliant on the vent it would need to pass about 40l/min.

[Edited on 31/1/14 by davidimurray]


True, but it is only air rather than fuel so it can move quicker. As an example, here's one I plucked off Ebay;

http://www.ebay.co.uk/itm/221352007016

That shows the vent line you're referring to, but a much smaller bore than the main fuel pipe. That's what I would consider if I had the same problems you have.

scutter - 31/1/14 at 03:58 PM

I don't think the vent will help, don't most pumps work by sensing an increase in liquid level.

Our cars are effected by the fuel hitting the bend in the filler hose and effecting the mechanism.

Regards Dan.

renetom - 31/1/14 at 05:24 PM

Just put it on the top
problem solved.

davidimurray - 31/1/14 at 05:32 PM

quote:
Originally posted by renetom
Just put it on the top
problem solved.


But then that means I am left with the rear ALU tub with a big hole and bolt holes around it that need to be tidied up/hidden

Some interesting reading http://www.straightdope.com/columns/read/230/how-does-a-gas-pump-know-to-shut-itself-off

renetom - 31/1/14 at 05:47 PM

Fit a grill over the hole & do one on the other side
to match, helps with the parachute effect.

Rear Vents
Rear Vents

steve m - 31/1/14 at 06:28 PM

Or, stick a smaller tube inside the filler that, will go to about the top of the fuel in the tank,
you put the fuel gun into the smaller tube, and that will mean that all the other area around the smaller tube, will allow the air pressure to escape around it, but not affecting the filling speed

Ive tried it, and it works

Biggest problem is holding the new inner tube into the filling neck, with out is slipping into the tank

But all I did was carry a small piece of rubber hose in the boot, and slip it over the fuel gun

Steve

davidimurray - 2/2/14 at 07:05 PM

quote:
Originally posted by steve m
Or, stick a smaller tube inside the filler that, will go to about the top of the fuel in the tank,
you put the fuel gun into the smaller tube, and that will mean that all the other area around the smaller tube, will allow the air pressure to escape around it, but not affecting the filling speed

Ive tried it, and it works

Biggest problem is holding the new inner tube into the filling neck, with out is slipping into the tank

But all I did was carry a small piece of rubber hose in the boot, and slip it over the fuel gun

Steve


That's a cunning plan - I like it