ANDYZ28

I am in the process of converting a 1990 IROC-Z ex-race car (rolling chassis) back into street condition. I have installed the engine, and even had it running briefly. I thought that I had everything all worked out, that is until I attempted to install the factory '91-'92 oil cooler (RPO KC4). The oil cooler tubes have a support bracket that attaches to the block at one of the mechanical fuel pump plate bolts, and the cooler tubes occupy the same space that the pump does. Since I have a mechanical fuel pump this is a problem. I figure that the mechanical pump will have to go.

I am posting this on the TPI board because I want to know if I can use the stock in-tank pump to supply the fuel, and some sort of bypass fuel pressure regulator to reduce the pressure to the 5 psi required for the carb? There is no fuel tank in the car now, so any changes can be done fairly easy. Or mount a new electric pump near the tank? I would like to leave the original type pump/pickup in the tank if at all possible. Are these approaches feasable?

Thanks, ANDYZ28

Shagwell

Yes. You'll have to bypass the extra fuel that the efi pump supplies. Otherwise it works. - I've done it(not on a hi-po set-up) simply running a "t" with a valve on the return line to regulate presure at the carb. If you're running any type of preformance motor, I would recommend running some type of bypass regulator to properly meter the fuel.

ANDYZ28

I am sunning the 406 SBC very similar to the one built by Chevy High Performance Magazine http://chevyhiperformance.com/techa...s/148_0306_406/

I guess the ideal situation would be to use an in-tank pump that only produces carb friendly pressure, but I don,t know of anyone who makes one. Otherwise I am going to use a bypass type regulator as you have suggested.

Thans, ANDYZ28

ANDYZ28

I have decided to run a TBI in-tank pump due to it's much lower pressure, along with a return type regulator. But can this pump deliver enough fual at WOT on the street? I only see aftermarket pumps available for TPI. I am sure someone on this board knows the answer.

Another small problem has surfaced; It seems that I must run the 7730 ECM for my speedo and cruise to work properly. Will I need to run "a" prom for this to work. Sorry, but I gotta have my cruise!

I have an ECM and the two black plugs that connect to the ECM, but where does the yellow plug come from?