fuel flow sensor?

[Gusse]

At least Conrad.de sell fuel meters at reasonable price.

Here is one example of fuel meter circuit: Fuel Meter by Possi
Used fuel meter: Fuel meter (DURCHFLUSS-IMPULSGEBER INDUKTIV POM) (in German)

I hope this will help you. I have my own plans to make fuel meter too. Still under planning stage...

BR,
-Gusse-

It seems that links were not working, lets try other way
http://www.conrad.de
Skip ads by clicking weiter in den Conrad Online-Shop >>
Left bar: Stichwortverzeichnis
Select letter: D
Select: Durchfluss-, Füllstands- Sensoren, Schal
There you'll find fuel meters.

And to go to directly to fuel meter page used in application
Type 126055-44 to Schnellsuche and you will go directly to right page.
Price is 39,31€.

I don't know how to translate web page to English (Google translate won't work), but I think you will get some idea about parameters just by looking specs (or use Google translator for single words).

It is analog output and will need an OP-amp. See more details from Possi's page.

BR,
-Gusse-