Hey guys continuing my pre build research and have a fuel pump question.Did the search deal but only found belt driven. ON a drag race only application is there a reason that you cant run the timing cover mounted enderle or hilborn pumps of the correct size and use a bypass regulator on a carbureted blow through application? This will be on a bbc 427 TV8101 turbo in an altered with a front mounted fuel cell, this just seems a lot less complicated than the belt drive approach. This is just a fun bracket car and is not any sort of max effort deal probably wont run the motor much past 6200 rpm. I like the kiss principal alot. OK now you can let me have it lol.

 

No one has tried this? Well it looks like I may be the pioneer and have to report back. I think it may work provided I can get a regulator that can bypass enough volume.

 

I'm doing that same thing with a Pontiac 389(406), Moon front cover and a Hilborn pump.

#ad


#ad


#ad


Still not close to running but I've talked to a few people that run the pump with the original mechanical fuel injection systems (Hilborn, Enderle) and I'm told as long as you keep it under 150 lbs pressure it will live a long life on the street. I want to run it to feed a CSU 750 and will use a bypass reg to return the excess back to the tank, to take the pressure off the pump. The one person says his has about 25-30 psi pressure at idle (did not find out what rpm his idle was ). The nice thing with a carb is the fuel in the bowls will allow you to start the car until the pump pressurizes. If using EFI or mechanical FI, you have to have a priming system to start it. I'm concerned with the pump pulling all the way from the rear of the car, cell. I may add a small aux. tank in the front fed by a small elecric and then draw from that to the Hilborn pump. My biggest problem was finding a spud drive adapter for a Pontiac. Found a local small boat/machinest place that made some for a local Pontiac top fuel dragster nostalgic racer and got one. This is a pic of the adaptor and the adaptor and spud together. Mark L

#ad


#ad


This runs directly off of the cam gear. I think it weill work well since this pump originally ran on a top fuel dragster back in the '70's and made over 3000 hp. Should work for me. Mark L

 

Very cool car Mark, I'm thinking if the regulator can hold the pressure and has enough bypass area it should work. I wonder about bypassing it back to the pump instead of all the way back to the tank, your thoughts. Also hadn't considered the fuel in the carb for restarts, can remember the squeeze bottle routine on our old stack injected race car. I will need to do the calculations for the amount of fuel I'll need so I can figure out which pump to start looking for. As mine is a chevy I have good access to front covers and cam drive adapters.

 

Sorry it took so long for a reply. I'm not sure about returning it to the pump?? Never thought of doing it that way. I have to give that some thought though. I was thinking about running a cheap electric pump from the tank to a small cell up front and feed the Hilborn pump from that by gravity. I could return the bypass to the that front cell but not sure in what condition the bypassed fuel would be in. Foamy or possibly warm to hot??? Might be better off with fresh fuel from the tank, but I am totally unsure. It might work just fine. If you just returned it directy to the pump I'm not sure what the inlet/suction area of the pump will do with one feed from the tank and one from the bypass return?? If I use a cell in front I feel I might need a small metal tank with a float system to keep a level in the cell. You'd have to vent the tank somehow to allow fuel in and out. Then the bypass should go all the way back to the main tank. Actually, if the Hilborn could create enough pull to just use the pump and no other items (front cell extra ele. pump etc) it would be the best. Just don't know how strong the pump is if it can maintain enough flow pulling it all the way from the back against all the G forces. The simplest way build it that way first and see what kind of flow the pump maintains. Must remember to give thefuel tank in the rear a nice big open breather so that is not a restriction. Have you done anything since this post?? Mark L