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Foam filled fuel tank and fuel gauges
Slimy38 - 31/1/14 at 04:22 PM

Following on from another post talking about baffled fuel tanks, I was wondering how I might use some of those foam blocks in mine. In particular, how do I get a fuel gauge to work right, if the fuel tank is filled with foam?

Do the foam blocks reduce the tank capacity appreciably? Is it something I should even consider for a primarily road car?

nick-york - 31/1/14 at 05:26 PM

Hi ! Im using a tank with one baffle and a sender unit . For mainly road use i don't think there is any need to fill with foam .I think you would be better with a working fuel gauge and no foam . Just my personal opinion . Other people might have different opinions. - nick.

rodgling - 31/1/14 at 05:28 PM

Some fuel gauges use a float inside a tube, which works fine in a foam-filled tank.

The approach I've taken is to use twin fuel pumps (one at each end) T'd together, which is pretty effective, and cheaper/easier than a swirl pot.

Slimy38 - 31/1/14 at 05:56 PM

quote:
Originally posted by rodgling
Some fuel gauges use a float inside a tube, which works fine in a foam-filled tank.

The approach I've taken is to use twin fuel pumps (one at each end) T'd together, which is pretty effective, and cheaper/easier than a swirl pot.


The foam was more from a safety point of view, I'd stick a couple of baffles in either way to prevent starvation. The tube float sounds useful though, I'll see what I can find. Thanks.

daniel mason - 31/1/14 at 06:02 PM

ive got a good one for sale. radical prosport foam filled race tank. pics in archive.
usually £501 + vat and post,
im after £80

matt_gsxr - 31/1/14 at 07:56 PM

Various VW fuel level sender ones have a tube.

GSXR1000 motorbikes use a couple of thermistors and use the temperature difference to inform that you are about to run out.

Slimy38 - 31/1/14 at 08:33 PM

quote:
Originally posted by matt_gsxr
Various VW fuel level sender ones have a tube.

GSXR1000 motorbikes use a couple of thermistors and use the temperature difference to inform that you are about to run out.


Ah, that might be an option, rather than a proper fuel gauge I can just use a low level light like on my bike. It's enough to keep my bike going so it will do fine with the car.