ok i have already done the swap from tbi to carb and ive had it running great for awhile. ive been using a inline electric fuel pump then it went bad. so i bought a nice areomotive fuel regulator with summit pressure gauge on ebay for 27.59 ( i couldnt pass that up) it has a inlet in the bottom and a outlet on both sides. ive got it all hooked up. im using my intank pump now. i have my gas line coming in to the bottom and one goin to carb and other is going to return. now when i start the motor it shows 1/2 to 1psi of pressure? but when i clamp off the return line i get 6psi. is that normal? i drove the truck and hit the gas and it didnt bog? also i set it to 6psi with the return clamped off then relased the return. any advice? and is this just the way they are with the return?

 

anybody?

 

which regulator did you get. sounds as though you have a regulator that is not a bypass regulator which is what is needed. the port you have for return is also a feed port. that is why you are loosing pressure with it open. if you look at the reg you have it prolly sais one in and the other two say out. is should say in on one, out on one, and ret on the other.

 

you are right. it has one in and 2 outs. is there something i can do with this one to make it work? its a Aeromotive fuel regulator Carb 13205

 

the only thing i can see doing is buying one of them cheap inline ones and put it on the return side. or drop the money and buy the right one.

 

ive never heard of them? can u send me a link? or a description? Thanks

 

how about this?? i took a hose clamp thats shaped like vice grips in a way. i took those and clamped the return line about halfway off and now its reading a good 4psi. would this work ok? im not looking to race it or anything just to drive back and forth to work everyday. do i have to have it at a full 6psi?

 

bump please

 

http://www.autozone.com/autozone/cat...ndName=Spectre

 

so i would just take that regulator and put it between my regulator and return line and set it to my psi? how bout the way i have it now will it work fine?

 

yes sir. or put it in there and keep turning the dial till you get 5 psi. that should do it.

 

ok great. also what about the way i have it now with the return line part way restricted?

 

Here is what you are supposed to use:

http://www.summitracing.com/parts/MAA-4309/

 

the holley and the barry grant one i use are cheaper in price and work just as well.
you could try it they way you have it but i wouldnt advise it. but hey its your car. you will need at least 4.5 psi.

 

ok thanks. ill try the cheap one that will go between my regulator and return line then. also how come when i first put it on it would read 1/2 psi to 1psi and i went down the road WOT and no problem at all never bogged out?

 

just luck i suppose. please dont leave it like that. do it right now.

 

I wouldn't waste my money on that Spectre fuel pressure regulator. They make some real junk and their pressure guage and filter I tried both leaked.

Your Summit guage might not be giving you an accurate estimate of fuel psi. I bought one of their liquid filled ones recently and drove with it underhood. The engine temps alone caused it to become very inaccurate and erratic. According to it, I could drive down the road at WOT on less than 1 psi with no hesitation or bogging.

 

instead of trying to band aid the problem you need to break down and by the correct regulator for it. a bypass one. you are going to end up with a lot of problems down the road.

 

well thats what i will probly do then is just buy the right part. and im new to this whole carb world so what kind of problems am i looking at if i keep it this way? Thanks for all the good help!!

 

what kind of problems would i possibly be looking at if i left it this way?

 

its only fuel. the most flammable thing in your car. but its your car. im sure there will be people that say nothing. i go by murphy's law. if it can it will. if you are comfortable with it then it is your decision. most if not all on here will tell you no dont do it. but if you feel comfy riggin it then do it. but dont ask correct info if you are going in that state.

worst case scenario. you will burn up the car.

 

Please please please get the right regulator. The mallory unit was on my carb conversion and worked great. If you buy a cheap and god forbid it fails you may loose all fuel pressure..... or it might not return at all and pump so much fuel in the bowls that fuel starts squirting out of every hole on the carb all over the top of the engine. I've seen this happen. If your car is hot when this happens it WILL burn to the ground!

 

It is possible to use the cheap type regulator with a restricted return to allow constant flow through the in-tank pump while retaining sufficient pressure at the carb. It's best to have a fuel pressure gauge you can watch while putting the vehicle under maximum fuel demand so you can observe the pressure. The least restriction that maintains fuel pressure under max demand is what you're looking for.

Of course, a return style reg like the 4309 takes care of that issue for you, and will flow more to keep the in-tank pump cool than a restricted return will.

 

well this is crazy but ive been driving it back and forth to work for 2 days and we took a 2hr trip in it and no problems? i have just left the return wide open so i know its flowing back to tank with no problems and my pressure reading going into carb is only 1lb max? i have done burn outs and passed several cars and no problems at all? now my question is am i going to hurt anything with it hooked up like this? again my return line is not rescricted at all.

 

Fuel line pressure to a carb serves one purpose and one purpose only - keeping the fuel bowl full. If the fuel bowl stays full under all conditions with 1 psi line pressure, then there isn't anything else that can go wrong.

What you don't know is if the fuel bowl is staying full when doing burn-outs or passing other vehicles. If it seems okay, though, it probably is.

 

ah i see. so then i would say that maybe its not staying full in bowls when getting on it but it does seem to be doing just fine and ive had the gas held down to the floor and probly hit about 95- 100mph and it never bogged out or anything so if there is nothing else to worry about then im happy with it? Thanks to all of you for your excellent help!!!