Fuel System Revisited...(for roadracing)
Fuel System Revisited...(for roadracing)
Just a few pics to give you a better idea of the fuel system now that I am changing it to walbro in tank with the sx pump and swirl tank + battery in the trunk... Doing it this way eliminates the "fuel transfer pump" and several lines and makes it much cleaner.
Basically, I wanted to streamline the system and make it approvable to the various racing sanctioning bodies. I enclosed the fuel pump in a sealed enclosure, battery same, wiring is done right and adding an external kill switch to the back of the car that kills the ignition, alternator and fuel system. adding a kevlar firewall to the trunk(more durable if I roll as I roadrace) = hopefully no problems and massive fuel. I just fabbed it myself with a tig welder treadplate etc. I cleaned up the electrical and did harnesses and looms for all wiring too.
Basically, I wanted to streamline the system and make it approvable to the various racing sanctioning bodies. I enclosed the fuel pump in a sealed enclosure, battery same, wiring is done right and adding an external kill switch to the back of the car that kills the ignition, alternator and fuel system. adding a kevlar firewall to the trunk(more durable if I roll as I roadrace) = hopefully no problems and massive fuel. I just fabbed it myself with a tig welder treadplate etc. I cleaned up the electrical and did harnesses and looms for all wiring too.
Last edited by gt40; Jul 21, 2004 at 08:01 AM.
Here is the layout and current track based power levels:
https://www.evolutionm.net/forums/at...chmentid=39521
https://www.evolutionm.net/forums/at...chmentid=39521
Awesome work! 
Your system is almost exactly what I wanted, though I always was wondering how I could go from the stock fuel tank to a fuel cell. Your idea of using the surge tank is the perfect transition for that.
Where does that surge tank come from (fabbed or purchased)? Also have you had any issues with backpressure into the walboro pump or with the surge tank not having enough fuel at any given time?
With my system I will probably have the fuel pump enclosed but underneath the car for safety reasons.
What fuel rail are you using. Most replacement fuel rails for the Evo are for use with the stock fittings and not for AN fittings. I want one for the latter.
As far as wiring goes, make sure you also add a circuit breaker between your kill switch and the battery. You do not want an electrical short anywhere in your cable to cause problems. I used a rockford fosgate breaker from an audio shop in my last car.
EDIT: I now see the inline fuse, but a circuit breaker is still nice.
For the kill switch, you can buy a spare tailight assembly (off a wrecked evo) and drill the hole through that. For the street, you just remove the tailight and swap it back to stock.
Your system is almost exactly what I wanted, though I always was wondering how I could go from the stock fuel tank to a fuel cell. Your idea of using the surge tank is the perfect transition for that.
Where does that surge tank come from (fabbed or purchased)? Also have you had any issues with backpressure into the walboro pump or with the surge tank not having enough fuel at any given time?
With my system I will probably have the fuel pump enclosed but underneath the car for safety reasons.
What fuel rail are you using. Most replacement fuel rails for the Evo are for use with the stock fittings and not for AN fittings. I want one for the latter.
As far as wiring goes, make sure you also add a circuit breaker between your kill switch and the battery. You do not want an electrical short anywhere in your cable to cause problems. I used a rockford fosgate breaker from an audio shop in my last car.
EDIT: I now see the inline fuse, but a circuit breaker is still nice.
For the kill switch, you can buy a spare tailight assembly (off a wrecked evo) and drill the hole through that. For the street, you just remove the tailight and swap it back to stock.
Last edited by TearItUpSports; Jul 21, 2004 at 04:42 AM.
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look very well done! sorry if you have already said but wha tinline pump are you using? Bosch?
and you welding skills dont look to shabby neither! LOL
very nice work, the only thing i would like to see is a larger swierl pot but thats just me!
thanks Chris.
PS. what lines are you going to be running?
and you welding skills dont look to shabby neither! LOL
very nice work, the only thing i would like to see is a larger swierl pot but thats just me!
thanks Chris.
PS. what lines are you going to be running?
Awesome work!
Your system is almost exactly what I wanted, though I always was wondering how I could go from the stock fuel tank to a fuel cell. Your idea of using the surge tank is the perfect transition for that.
Where does that surge tank come from (fabbed or purchased)? Also have you had any issues with backpressure into the walboro pump or with the surge tank not having enough fuel at any given time?
With my system I will probably have the fuel pump enclosed but underneath the car for safety reasons.
What fuel rail are you using. Most replacement fuel rails for the Evo are for use with the stock fittings and not for AN fittings. I want one for the latter.
As far as wiring goes, make sure you also add a circuit breaker between your kill switch and the battery. You do not want an electrical short anywhere in your cable to cause problems. I used a rockford fosgate breaker from an audio shop in my last car.
EDIT: I now see the inline fuse, but a circuit breaker is still nice.
For the kill switch, you can buy a spare tailight assembly (off a wrecked evo) and drill the hole through that. For the street, you just remove the tailight and swap it back to stock.
Your system is almost exactly what I wanted, though I always was wondering how I could go from the stock fuel tank to a fuel cell. Your idea of using the surge tank is the perfect transition for that.
Where does that surge tank come from (fabbed or purchased)? Also have you had any issues with backpressure into the walboro pump or with the surge tank not having enough fuel at any given time?
With my system I will probably have the fuel pump enclosed but underneath the car for safety reasons.
What fuel rail are you using. Most replacement fuel rails for the Evo are for use with the stock fittings and not for AN fittings. I want one for the latter.
As far as wiring goes, make sure you also add a circuit breaker between your kill switch and the battery. You do not want an electrical short anywhere in your cable to cause problems. I used a rockford fosgate breaker from an audio shop in my last car.
EDIT: I now see the inline fuse, but a circuit breaker is still nice.
For the kill switch, you can buy a spare tailight assembly (off a wrecked evo) and drill the hole through that. For the street, you just remove the tailight and swap it back to stock.
1. I have a bj's sheetmetal intake manifold- the manifold comes with its own rail setup with AN fittings already. Also up front is a SX fuel pressure reg, detachable AN bulkhead fittings(for servicing the lines if necessary)
2. The surge tank comes from GT Fabrications who also made the bulkhead setup originally for me and was custom made( he made a batch of them I think though)
3. Regarding keeping the surge tank always completely stuffed, I have the walbro feeding the surge tank + the return line from the rail also goes to the surge tank first and then there is a "overflow" line going to the stock fuel tank return line fitting. This way there is always a positive pressure differential.
look very well done! sorry if you have already said but wha tinline pump are you using? Bosch?
and you welding skills dont look to shabby neither! LOL
very nice work, the only thing i would like to see is a larger swierl pot but thats just me!
thanks Chris.
PS. what lines are you going to be running?
and you welding skills dont look to shabby neither! LOL
very nice work, the only thing i would like to see is a larger swierl pot but thats just me!
thanks Chris.
PS. what lines are you going to be running?
Last edited by gt40; Jul 21, 2004 at 08:46 AM.
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Took the afternoon off and installed stuff. I killed a relay though so I will have to wait till tomorrow to see if it runs properly. I tested the walbro in the tank and and it works perfect with the relay. The second relay is supposed to turn on the SX pump but I killed it. NO LEAKS!
Last edited by gt40; Jul 21, 2004 at 08:25 PM.
Almost forgot, I added this really important addition- a fuse right by the battery. If the pos line gets cut or shorts it won't burn the car! Also throwing a pic of the install mess...
Originally Posted by gt40
I am guessing you have a walbro in the surge tank...
http://www.ksp-eng.co.jp/ATTAIN/menu5/14.html
http://www.maxcooper.com/rx7/parts_i...exi_bnr32.html
I use the walbro to fill the surge tank.
Last edited by Crazy4Cars; Jul 23, 2004 at 12:10 PM.