[Bsinclair]

Mike, I noticed your return going through the flex fuel sensor only. I did the same thing on my grand national but ran into problems. I have a 10 feed and 8 return. i noticed while on the dyno the fuel pressure flat lined on the 4psi gatespring then started to fall off at higher rpm's. This showed a restriction on the return side which at first i thought i had a regulator problem. turned out the flex fuel sensor was just bottle necking return fuel. we added a y into the inlet and outlet from the flex fuel sensor and that fixed the issue.

Originally Posted by MeanMike

Fuel system is done. I'm taking a little risk here for an experiment. I had a -10 feed and -8 return before with a big loud fuel pump. I've always built overkill in a fuel system, but that may have been going to far. My last mustang made 600 at the wheels with a single -6 line returnless system. Will a single -8 feed 950 flywheel hp? I'm going to find out. I'm also not dual feeding the fuel rails. Big hp efi cars make 2500 hp feeding 8 x 160lb/hr injectors on a single fuel rail on each side, I'm doing less than that with 6 in basically one rail. I have the y-block and lines to dual feed later if I find issues on the dyno.

The tank is a stock replacement GN tank, with twin 340lph racetronix pumps, -8 feed to a holley 175gph (660lph) 10 micron e85 safe filter, -8 to the passenger rail, a -8 crossover, then my weldon 2040 regulator to a -6 return running through a GM flex fuel sensor. I had intended to do stainless hardline, but without pulling the body off the frame, it just wasn't going to be practical. I would have had 6 feet of hardline max and added more joints to leak. The body wont' come up off the frame at all with the cage in the car.

From back to front.




Both lines run inside the frame all the way up front and out the stock hole in the crossmember.