I know the lines can handle enough. Although Having a bigger fuel system won't hurt anything. At least at that point I know I will always have enough fuel. As for the failing pump, having a single isn't really alleviating any risk. If it fails then you have NO fuel. At least if one 255 failed I might have enough from one pump (depending on power made) to not destroy the engine. But I could always run a bigger external, so then if the in-tank failed I would have enough fuel.

There are all kinds of what ifs here and so many possible solutions, but also downfalls to each of those respective solutions. As has been stated, I should talk with my tuner before making any final decisions.

 

That thinking is flawed... you can't hurt anything without any fuel, the engine just stops running. However, you can hurt things with not enough fuel!

 

Exactly my point.

 

Valid point. Lol. That being said, I would run a secondary fuel pump on a manual switch, so I should hear it prime when I plan to use it. Obviously pumps can make priming noises and still have issues, but it has some level of indication that things are working as they should. And if my car is running fine under normal driving conditions without the secondary pump running and I hear it prime after turning it on, there should be some level of confidence there.

 

2 things....1) I do safety/ failsafe design for a living and trust me when I say hearing it prime does nothing for you, and 2) besides not being able to hear the 2nd pump at WOT you'll have no idea if the pump is intermittent or drops fuel pressure during a pull. You are just adding more failure points and expense than just putting in a bigger single in tank.

 

Are there any direct fit, bigger fuel pumps? It looks like the racetronix rxp341 is a direct fit (according to ws6 store). If I already have a 255 kit w/ harness installed would it be as simple as just swapping pumps and reusing the rest of the stuff that's already in the 255 kit?

And I know the return line issues would need addressed. I was planning on running a rail mounted fpr if I went external anyway.

 

If you already have a 255 kit with harness, yes you can swap in a 340 or 450 very easily. Some people will tell you that a 450 is too big for the stock regulator, but several (including me) have done it without issue. You'll obviously have to retune for the large fuel pump and higher pressure, but otherwise you don't have to deal with a return setup unless you choose to.