need FAST fuel line advice
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Instructor
Joined: Nov 2003
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From: west hills ca
need FAST fuel line advice
I have the new FAST fuel rails and am hooking up the fuel lines so will attach to oem fuel outlet. It appears there is insufficient room between rear of manifold and firewall to attach lines to rear of rails. Can I cap off the rear of the rails and run two fuel lines off front of rails going into a Y single line attached to the oem fuel outlet? There would be no crossover line and I would have to attach a fitting on drivers side fuel rail to accept the fuel pressure sensor. Any advice and/or photos of your set up would be appreciated.
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From: http://www.mphparts.com 800-364-1975
I had the FAST fuel rails on one of my cars. Indeed, there is not much room at the rear of the rail. You can get away with capping the rear of the rail off and just feeding in the front, but the best scenario would be to notch the firewall so your fittings can clear, and then put new fiber glass down.
One problem I've had with virtually any aftermarket rail/regulator setup is that fuel pressure drains off fast when the car is off, thus allowing air into the rails (they are the high point of the whole fuel system). Depending on how you're setup, capping the back may cause more air than is necessary to go through the injectors instead of being passed through the regulator and to the return.
I don't know enough to tell you whether or not it's a problem, all I can tell you is that every shop I've ever talked to recommended flowing through the rails and not capping one side or the other.
Another option is to go with the ECS fuel rails, they have a side tap on the driver rail (which is the one closest to the firewall) which allows you to flow through without cutting the firewall.
One problem I've had with virtually any aftermarket rail/regulator setup is that fuel pressure drains off fast when the car is off, thus allowing air into the rails (they are the high point of the whole fuel system). Depending on how you're setup, capping the back may cause more air than is necessary to go through the injectors instead of being passed through the regulator and to the return.
I don't know enough to tell you whether or not it's a problem, all I can tell you is that every shop I've ever talked to recommended flowing through the rails and not capping one side or the other.
Another option is to go with the ECS fuel rails, they have a side tap on the driver rail (which is the one closest to the firewall) which allows you to flow through without cutting the firewall.
Thread Starter
Instructor
Joined: Nov 2003
Posts: 214
Likes: 0
From: west hills ca
Originally Posted by diynoob
I had the FAST fuel rails on one of my cars. Indeed, there is not much room at the rear of the rail. You can get away with capping the rear of the rail off and just feeding in the front, but the best scenario would be to notch the firewall so your fittings can clear, and then put new fiber glass down.
One problem I've had with virtually any aftermarket rail/regulator setup is that fuel pressure drains off fast when the car is off, thus allowing air into the rails (they are the high point of the whole fuel system). Depending on how you're setup, capping the back may cause more air than is necessary to go through the injectors instead of being passed through the regulator and to the return.
I don't know enough to tell you whether or not it's a problem, all I can tell you is that every shop I've ever talked to recommended flowing through the rails and not capping one side or the other.
Another option is to go with the ECS fuel rails, they have a side tap on the driver rail (which is the one closest to the firewall) which allows you to flow through without cutting the firewall.
One problem I've had with virtually any aftermarket rail/regulator setup is that fuel pressure drains off fast when the car is off, thus allowing air into the rails (they are the high point of the whole fuel system). Depending on how you're setup, capping the back may cause more air than is necessary to go through the injectors instead of being passed through the regulator and to the return.
I don't know enough to tell you whether or not it's a problem, all I can tell you is that every shop I've ever talked to recommended flowing through the rails and not capping one side or the other.
Another option is to go with the ECS fuel rails, they have a side tap on the driver rail (which is the one closest to the firewall) which allows you to flow through without cutting the firewall.
