Hey guys I decided to swap my buddies car to carb for him the other day from tpi so i got the stock harness out and everything wired up in liek 3 hours then i was going to do the fuel system but i was thinkin, when I put the 40-some pounds of fuel pressure into the regulator can I just clamp it? or will it blow off cause of the pressure?? thanks

 

i dont think a clamp will hold that much pressure....

 

You should not have 40 psi in the system. You should be using a return-type regulator that controls pressure to the carb by allowing or limiting return to the tank. With that type of reg, you shouldn't have more than the set pressure anywhere in the system.

If you were planning on using a dead-head type of reg (the cheaper ones), change your plans before you burn out the in-tank pump.

 

I thought that since theres a TPI pump in the tank the pump puts the amount of pressure needed for tpi right into the feed line so when It goes into my return style regulator its 40 or so punds and it regulates the outgoing lines like the one going ot the carb to like 5, Or does the tpi have a stock regulator that holds the fuel so the pressure is increased??

 

The stock reg is a return type, just not adjustable (although they can be made adjustable). It blocks off the return to maintain the desired pressure at the injectors.

 

57,
are you swaying that a 'dead head' regulator
won't tolerate 40psi inlet pressure?

 

I'm saying a dead-head reg isn't good for the pump.

 

a dead head regulator will burn up the pump from my experiences .......you need the return style

 

A more accurate way to put this is it varies the return flow in order to maintain pressure. More pressure needed, less return allowed. Pressure too high, more return allowed.

 

OK, my suggestion is:
assuming that the tpi fuel pressure regulator is not sold,
.
keep the tpi reg,
plumb the low pressure regulator inlet, to the fuel supply line. (the '''''outlet''''' of the tpi regulator)
.
upstream supply line now regulated at 40 psi
.
That should keep the electric fuel pump happy, by maintaining
some flow.

 

The pump doesn't need to be pushing against 40 psi. It needs to be allowed to flow constantly. 6 psi is fine for the pump as long as there is always fresh fuel coming into and going out of it. If you use a deadhead reg, when pressure reaches 6 psi, flow is stopped, and the pump is going to sit there and overheat.

 

I used a mallory 3-port return style regulator. I took the original rubber fuel lines off and had compression fitting installed on the rubber lines to fit the regulator. Then I just reattached them to the original metal fuel feed and return lines.

Any high pressure hose shop will do this for you. I mounted the regulator on the drivers side shock tower close to the original lines. Oh yeah, I am still using the stock TPI intank pump.