ive run into a snag (i think) on my fuel system. I have a summit highflow high pressure 80psi fuel pump with 3/8" feed and return aluminum lines and a Mallory RRFPR. A while back i ordered compression fittings for the hard line to AN barb. Will the fittings hold 80PSI or will they pop off the second they see pressure? Anyone do what im doing? If they have to be flared, where do i get flare nuts for aluminum line?

 

compression fittings + 80psi, yay or nay?

 

I've seen cases where compression fittings have worked for brake lines, which have way higher pressure than 80psi. Of course it was extremly dangerous, and they could have popped at any time. However, your pressure is no where near that so I think you ssshhhoooouuulldd be okay. Can't guarantee the longevity of the setup though.

 

you won't be running 80 psi.... that's what your regulator is for, set your regulator to the desired pressure and that's the pressure your fuel system is seeing. on a blowthrough set-up it will likely not see anymore than 15-20 psi.... compression fittings will hold just fine.

 

My pump is 80 psi, won't the line tank to regulator see 80psi?

 

I really don't think 80psi will blow the fittings out, just isn't the safest way to do it.

 

i dont thin you will blow the fittings.. it also depends on howbig the line you are using is... i personally wouldnt use compression fittings but they would do for a short period of time. good luck

 

The only time you will see the full 80psi is when the line from the pump to the regulator is when you don't use a FPR with a return fitting. With the return fitting, any extra fuel not needed to produce the pressure you set the FPR to is sent back to the tank. This will equalize the pressure both before and after the regulator. Without the return line, the pressures aren't equalized and you will see your set pressure after the regulator and full pump pressure before the regulator.

In regards to your original post, compression fitting are used in household plumbing all the time. These fittings will generally see anywhere from 50-70psi on a much larger fitting. Thing to remember, the larger the fitting, the lower the pressure handling of the fitting. Your 3/8" compression fittings will have no problem holding up to 80 psi if installed properly.

 

Your guys are awesome! I jut hope with my 3/8 feed an return my regulator can get the idle pressure down to ~3psi