hey guys,i just had a question about fuel for my car. i pulled out the 2.8 fi engine and am putting in a carbd v8. my question is, which route should i go with fuel delievery? should i leave the stock pump (or aftermarket replacement) and just use an adjustable fuel pressure regulator with an extra return to the tank, or just fab up some lines and use a mechanical style fuel pump? thanks guys
Brad

 

you wont get that fuel presure down low enough, atleast not with a regulator under a few hundred. theres 3 ways to do it

#1-my way, unhook power to the stock pump, can be done a few dozen ways, easiest is the 3 fuses(2 in the fuse box and one inline next to the battery) get your self a nice high pressure air hose and pick the feed line(disconnect both lines) and blow air into it into you hear it bubble in the tank, theres a seal in the pump that will only allow it to go one way, this is why most people dont have success running thru the old pump because they dont know about that seal, be careful thou cause when u let off that air it'll come gushing back thru like a fountain if you have a full tank(might happen with less than that too im not sure how low it needs to be not to happen) remove the factory fuel filter, u can do this first actually to keep the crap from getting in your tank, and run it off a mech pump on the block and you wont have a problem at all.

#2 remove the factory pump and run new lines to a mech pump on the block, this is the professional way to do it.

#3 disconnect the factory pump and buy yourself a nice electric pump to mount in the engine bay, probably the most expensive route.

using a regulator to a carb is out of the question, trying to take i beleive about 30psi down to 5-8 isnt going to happen, now if the car had been a factory tbi its a little more do able but still more expensive than just doing it the other ways. i did the exact same swap and the first way is how i did it, only problem i have noticed, is if i push her to E she gets a little more starved for fuel in the corners than she did when it was still the in tank pump doing all the work, but not much worse, and you shouldnt be pushing a car to E that often anyways.

 

awesome, thanks zeus, i kept getting different opinions onthat.

 

i agree, i would go with the mechanical pump on the side of the block.

 

i was trying to avoid that since one of the bolts broke off inside the block, but i guess i'm gonna be doin some drilling lol

 

you dont have to, you could do an inline fuel pump somewhere like zeus said. ORR, since it was a TBI unit, you could go ahead and do the regulator with a return line, but thats a lot of work and does make for more places a leak could come up.

 

problem is, it wasnt a tbi car, mpfi v6 lol

 

before u drill, theres a tool made for removing broke off bolts they sell it at most auto parts stores, sorry i cant tell you the name as ive had mine for quite a while and the name wore off the package long ago, but it should be right with the tools or just tell them what u need and they should be able to show u it, you still need a drill but its alot eastier than drilling and retapping. mechanical is the way to go, especially with the cost of a mech pump being less than $20, you cant beat it.

 

oh yea, ha, my bad, "read before you post TOM" oh well.. i tried

 

jeeze tom pay attention! haha, i guess its a good thing i'm really good at drilling and re tapping, cuz i've tried just about every broken bolt extrator out there, and they all suck lol. plus its only two bolts i need to drill, and one i can just double nut and pull out, so i'm not too worried. and yeah, i guess i was just having a lazy moment, mechanical would be much eaiser, i just didnt want to make new fuel lines, but at less than 10 psi, i dont really need steel tubing.