Jeffrox Posted March 11, 2012 Share Posted March 11, 2012 Hello All, As you can see on the attached picture, I am in the process of cleaning up my engine bay and I have a question regarding the fuel rail and FPR plumbing. I am using the Aeromotive 13109 FPR and I know that I need O-rings and a plug for the extra inlet. My question is in regards to the length of hose after the fuel rail, but before the FPR. Will this be an issue (or enough of an issue to warrant relocating the FPR)? Any help, advice or feedback would be greatly appreciated. Quote Link to comment Share on other sites More sharing options...
BluDestiny Posted March 11, 2012 Share Posted March 11, 2012 (edited) No. what kind of issue do you think it will cause? Its just some line. Just make sure it's fastened down tight and doesn't flail around. Is your paint job rattle can? It looks like it came out pretty clean Edited March 11, 2012 by BluDestiny Quote Link to comment Share on other sites More sharing options...
NewZed Posted March 11, 2012 Share Posted March 11, 2012 I think that he might be worried about fuel pressure control response time over the length of the small diameter tubing. I've pondered it myself. If the pressure didn't build quickly enough at the injectors because the extra line between the injectors and the FPR took time to pressurize, then you could imagine a lean condition when lifting throttle or shifting down a gear (higher intake vacuum at the FPR). How lean and whether it's significant, who knows. Quote Link to comment Share on other sites More sharing options...
MazerRackham Posted March 11, 2012 Share Posted March 11, 2012 I think that he might be worried about fuel pressure control response time over the length of the small diameter tubing. I've pondered it myself. If the pressure didn't build quickly enough at the injectors because the extra line between the injectors and the FPR took time to pressurize, then you could imagine a lean condition when lifting throttle or shifting down a gear (higher intake vacuum at the FPR). How lean and whether it's significant, who knows. Your engine bay make me hard in the pantalones. Would you mind sending me a PM with the modifications or posting them in this thread??? Quote Link to comment Share on other sites More sharing options...
tyler031734 Posted March 11, 2012 Share Posted March 11, 2012 (edited) Your engine bay make me hard in the pantalones. Would you mind sending me a PM with the modifications or posting them in this thread??? Oh C'mon you can SEE what he did... And to Jeffrox. What I did was put my FPR just near the hood latch and run my pressure line to the front of the fuel rail instead. I have like 8" of hose? But im sure its not a huge deal unless your running on the razors edge of performance. Edited March 11, 2012 by tyler031734 Quote Link to comment Share on other sites More sharing options...
BluDestiny Posted March 11, 2012 Share Posted March 11, 2012 Your engine bay make me hard in the pantalones. Would you mind sending me a PM with the modifications or posting them in this thread??? These aren't crazy mods, its pretty common. Headers, shaved N42 intake, fuel rail and lines, different trottle body( prob. a 240sx one) wire tuck....Just search peoples build threads Quote Link to comment Share on other sites More sharing options...
tyler031734 Posted March 11, 2012 Share Posted March 11, 2012 These aren't crazy mods, its pretty common. Headers, shaved N42 intake, fuel rail and lines, different trottle body( prob. a 240sx one) wire tuck....Just search peoples build threads You forgot my favorite mod. Electric fans Quote Link to comment Share on other sites More sharing options...
Jeffrox Posted March 18, 2012 Author Share Posted March 18, 2012 I think that he might be worried about fuel pressure control response time over the length of the small diameter tubing. I've pondered it myself. If the pressure didn't build quickly enough at the injectors because the extra line between the injectors and the FPR took time to pressurize, then you could imagine a lean condition when lifting throttle or shifting down a gear (higher intake vacuum at the FPR). How lean and whether it's significant, who knows. This was exactly what I was getting at. I was less worried once the car is on and the system is fully pressurized (I shouldnt expect too much of a drop, if any, when parked...right?) I was unsure about any play due to slack in the hose that might affect how well the FPR can modulate the pressure. I also did not figure that the 2lb difference between the recommended 38psi and the FPR's lowest 40psi setting would cause a problem, but again the additional slack was my concern. Thanks all for your help. I will report back any ill outcomes. Quote Link to comment Share on other sites More sharing options...
Six_Shooter Posted March 19, 2012 Share Posted March 19, 2012 The fuel pressure is the same from the FPR, all the way back through the lines to the pump. If you want to get REAL technical, there will be a SLIGHT drop each time an injector opens, but the FPR will recover quickly. By all rights you could place the FPR back at the tank, and not notice any changes in fuel pressure at the rail that are out of the ordinary, would just be a pointless endevour though. I have my Aeromotive AFPR located where the original fuel pump was and have not had an issue. The hose from the end of the fuel rail travels under the upper rad hose and to the FPR, so maybe a slight be shorter than yours that goes over the cam cover, but similar idea. Quote Link to comment Share on other sites More sharing options...
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