Fuel pressure reg.

[73ss]

Question: Are there any negatives to running a fuel pressure reg at the rear of the car by the tank?

I installed a in tank fuel pump assy that was supposed to be regulated for carb use. One fuel line to the front of the car and the excess fuel would be dumped back in the tank. It didn't work well at all. Barely could keep the carb full, Had about 4 psi and dropped under load. They (holley) sent me a new internal regulator and pump with the same result. I ended up blocking the internal reg (Very poor design) and temporarily installed a Edelbrock external regulator. I plumbed the return port back to the tank and used the factory steel line to the front of the car. As it turns out, It works great. I haven't touched it in a year. I have it set to 7 PSI and it drops and holds 5 under hard runs. The car runs great with no sign of bowl going empty. Actually ran my best quarter mile ever in 25 years.

I would like to leave the reg at the rear of car instead of moving it to the front and then plumbing a return. Space is limited under the hood, Big block with A/C. Any negatives to leaving the reg in the back? I mounted it to the crossmember between the tank and rear end. It's probably safer in the rear, cooler. Would like to hear others thoughts. Thanks.

[77cruiser]

Don't know how hard your car leaves, but if it hooks & leaves hard you need to extra pressure to keep the fuel from stalling in the line. I don't know what kind of 60 ft. it takes to stall 6 lbs.

[lightning boy]

No, 73 you have it plumbed just like it should be. The reg. after the carb. It doesnt matter where the regulator is mounted. The point is to have 6lbs or whatever available at the carb no matter how much fuel the carb is pulling, all the extra goes back to the tank. This is the best set up for a carb and the performance of your car proves it.

[77cruiser]

If you only have 6 lbs. pressure from the rear fuel will stall in the line at  1 G of less.

[73ss]

Thanks for the replies.

I measured the pressure at the carb inlet. I temporarily installed a gauge at the cowl. I didn't pay attention to it at the launch, I wanted to see the pressure on the big end and it held a steady 5 psi. The car is currently doing mid~high 1.7's on the sixty foot. My old engine with a mechanical pump would steadily loose pressure through a run and then typically nose over right at the end. A/F gauge also reads a steady 12.2 ratio during the run which would indicate the carb is staying full. I like the idea of keeping the reg in the back. I just need to do a more permanent install.