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Old 03-27-2009, 02:11 PM   #1
CarbonCJC
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Default Fuel Cell Tank *help needed*

Hey there,

I am looking into using a fuel cell located in the trunk of my car and was wondering if any one had any insight to doing this?

I don't mind running an external fuel pump... but would still like to have a sending unit and other sensors that the factory fuel tank has, so that I can wire it all directly into the factory fuel controller and ECU... this way the ECU doesn't know that I have changed anything.

Please help with advice or knowledge about doing this type of system, hopefully someone has already done it and can inform me to which route they went!

Thank you in advance!
-Cameron
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Old 03-27-2009, 04:05 PM   #2
sean18337
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Why are you looking to run a fuel cell?
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Old 03-29-2009, 05:41 PM   #3
CarbonCJC
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Sean,

We are going to be doing some fuel tests with the engine set up... and it is A LOT easier to drain the gas out of a fuel cell than the factory tank.

Once the fuel tests are completed, we are going to be relocating the fuel cell into different areas of the car to get the best balanced weight.

This is of course if we can run the fuel cell on the factory fuel controller without the ECU knowing that there is a difference.

Any thoughts, or do you know of someone that has done this?
-Cameron
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Old 03-29-2009, 05:52 PM   #4
MartinSTi05
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Off the shelf fuel cells can be had with a built in sending unit, but from the sniffing around i had done I couldn't find any that had the resistance values of the stock sending unit. You could get a signal isolator and scale them to the same though.
My setup FWIW.
http://forums.nasioc.com/forums/show....php?t=1676783

In the mean time what I would do is put a switch across the fuel pump, and then put a T/valve on a fuel line so you can simply pump the tank dry. Or you could use the built in drain plugs on the tank, even put a petcock on them, huhuh I said petcock.
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Old 03-30-2009, 12:14 AM   #5
CarbonCJC
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Martin,

I knew that someone out there had done the conversion... I thank you for posting! Your build is VERY nice, as many have already complemented.

I did some shopping around and found the fuel cells that you were talking about with the sending units built in. They seem to all use the 0-90 ohm sensor, and it looks as though AutoMeter has an electric fuel level gauge that reads off of that exact fuel level sensor... so if I do chose one of the fuel cells that already has it built in, I can just run a separate fuel gauge... then just do something clever with the factory fuel level gauge area of the cluster.

I like how you ran your fuel pump where the factory tank use to occupy... do you think that the factory Fuel Pressure Regulator and what nots will work alright with this after market fuel cell and external pump?

Eventually we will be adding new line just like you did, and then a new regulator and other pieces... but for now we need this system to run off the stock plumbing and regulator (except for the gauge).

Do you see an issue with this me running a similar set up as yours but through the stock lines?

Thank you for posting!
-Cameron
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Old 03-30-2009, 01:28 AM   #6
MartinSTi05
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As far as running a stock FPR with a cell by itself is no issue, doing it with a large pump you may have a problem keeping your fuel pressure down at times of low fuel consumption. The reason I ran all new lines was to increase the flow. Although the stock lines do not look to small the way they flare the ends takes some of the cross section away. If you want to make big power I would at least run a larger feed line, and then use both the stock feed and return line as the new return off the FPR. The sizes I worked out equate to a -8 feed and -6 return on my lines.
As far as the fuel gauge goes I will look into some signal isolator modules at work that should allow me to scale resistance, those would work out nicely for you.
Removing the Stock FPR in favor of a aftermarket one also leaves and easy way to convert from a series to parallel fueling setup. It is especially a boon on top feed cars, because the reg sits DIRECTLY above the #3 injector, which will naturally cause a low pressure are above that injector which is not good for fuel distribution.
Hope that helps, Jordan
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