Fuel pressure regulators, was Re: Fuel pump questions

[Carl Summers]

bruce plecan wrote:
> 
> Maybe I should have asked this first, are you talking about the FPR for
> the injectors, or for a seperate fuel system for when the NOS in on?.
> If your running one pump, and two metering systems, I'd recommend using
> a large difference in system pressures, and two return lines.  Sometimes
> if the NOS step isn't too large, they use the NOS to hammer the FPR,
> in it's vacuum reference line to just run the pressures as high as
> possible.  I'd use a fuel pressure guage on both to make sure one wasn't
> robbing the other, or that you're exceeding pump capacity.  While that
> -10 looks large, you have a BIG hole to fill when the NOS fuel solenoid
> trips if you're running a big NOS, and it's better to have too much
> fuel around, rather than not enough, and have it sneeze.
>   Bruce    nacelp at bright.net

a couple more notes(please read previous re) 
1. you never run two bypassing regs, the one with the least pressure
will always bypass,,,for the N2O use a standard reg, if lower pressure
is required....
2.Another mistake by most nitrous kit mfrs is they don't include a hobbs
switch to shut the system off after the fuel pressure drops below a
certain psi(I'm talking about the kits Bruce mentioned that max the
pressure to the EFI injectors on nitrous enable via the vacuum/pressure
port of the FPR) These type of kits ultimately kill the fuel pump and
gradually lose pressure, ultimately burning pistons,,,I have seen this
MANY times.....food for thought

-Carl Summers