Well I am going from fuel injection to carb and I am know I have to get a new electric fuel pump because although some companies claim their regulators will take a 30-50 psi pump down to 6-7 I have yet to see it happen. So I was thinking of going with a external electric pump but I dont want a pump that is real noisy and loud I want a nice and not real loud pump nothing redidicules just ingnorable from in the car Any one have any suggestions??? And my other problem is I know that these pumps will want to be gravity fed so I was thinking of putting in either a bulk head connector in the bottom of the tank or having to sump it if i can find someone to do it. Unless some one knows a way around this problem. I know they make in tank pickups but you loose a lot of volume making the pump siphon the fuel.
Efi to carb need help with fuel delivery.
- Thread starter wicked84gt350
- Start date
Well, i can tell you how i've seen it done, but it's not the smartest way...but it did work, and work reliably.
I HAVE seen regulators cut the pressure down, but IMO they're not safe enough to run...you're asking for it. So, either run an electric (which is better if you're gonna make a lot of power) or if you ask me you're better off with a mechanical like they came with stock, and just swap over to the correct front timing cover and run a mechanical pump.
As for the fuel tank, you could also hit up a junkyard for a carbed gas tank that already has it set up like you need it, or do what we did and modify the fuel injection pump. Basically, you remove the pump and replace it with a section of fuel line, and clamp the same style of fuel filter onto the end that the electric pump uses, and stick it down into the tank. You probably don't ever wanna run out of gas this way, but it did work without any problems for a good 3 years until my buddy sold his car.
It's a little more work but if you ask me, you'll be better off in the end if you swap the tank with a carbed tank (which might even be cheaper than having yours sumped) and get the right timing cover and a mechanical pump.
I HAVE seen regulators cut the pressure down, but IMO they're not safe enough to run...you're asking for it. So, either run an electric (which is better if you're gonna make a lot of power) or if you ask me you're better off with a mechanical like they came with stock, and just swap over to the correct front timing cover and run a mechanical pump.
As for the fuel tank, you could also hit up a junkyard for a carbed gas tank that already has it set up like you need it, or do what we did and modify the fuel injection pump. Basically, you remove the pump and replace it with a section of fuel line, and clamp the same style of fuel filter onto the end that the electric pump uses, and stick it down into the tank. You probably don't ever wanna run out of gas this way, but it did work without any problems for a good 3 years until my buddy sold his car.
It's a little more work but if you ask me, you'll be better off in the end if you swap the tank with a carbed tank (which might even be cheaper than having yours sumped) and get the right timing cover and a mechanical pump.
Well I found this areomotive pressure regulator 13204 that you can use a high pressure pump and regulate it for carb but the problem it is it 160 for just the regulator. I have all the parts needed to run a mechanical pump all ready on the motor but I just though it would be cool to run a electric pump plus I want to be able to put nitrous on it later (eventhough you can run nitrous with a mech pump) and fighigured I would run a electric pump because I have to run all new lines any way so why not take the load off the engine.
5.0 Fuelie
I dealt with this issue when I built and installed my 347 in my '89 LX. Here is what I did. I got a Holly fuel pump. (I forget if it was the red or blue pump... red I think) It came with an exernal regulator. I mounted the pump on the frame in front of the tank. Once you pull your tank you will see where the stock fuel filter is mounted. I actually used one of tIT'S screw holes to mount the new pump. I removed the fuel pick up from the tank. You can remove the electric pump from the assembly. I attached a piect of 3/8 brake line to the rubber hose that was used to conenct to the fule pump. I braised the 3/8: line to the pick up frame so it would not move around. Make sure that yo do not allow the new 3/8" pick up to sit below the level where the old pump was or you may stand a chance to pick up junk from the tank o\r even worse plug the new pick up against the bottom of the tank. I ran rubber 3/8" line from the pick up to the new pump. I also braised shut the return line pipe in the top of the pick up as you will not need it. I guess any way that you can plug it up would be good but braising it fixed it for good. I then ran 3/8" aluminum line form the pump to the right side fender wall (Inside the engine bay.) I just followed the original fuel line path. Once I got to the engine bay I mounted a great in line filter canister. I connected the new 3/8" line to the filter and from the filter to the regulator. From the regulator you can use 3/8" rubber tubing or better yet, braided line. It all works well. The only catch is the noise from the pump. I actually don't mind the pump noise. But if that is an issue with you, place a piece of insulating rubber (innertube or some type of professional sound isolating product) between the pump and the frame. This all works really great. If you want to know more, e-mail me and I wil be glad to provide any additional info that you need. Go Carbed! PS. If you are running any carb bigger than a 750 CFM use 1/2" line to insure adequate fule delivery.
I dealt with this issue when I built and installed my 347 in my '89 LX. Here is what I did. I got a Holly fuel pump. (I forget if it was the red or blue pump... red I think) It came with an exernal regulator. I mounted the pump on the frame in front of the tank. Once you pull your tank you will see where the stock fuel filter is mounted. I actually used one of tIT'S screw holes to mount the new pump. I removed the fuel pick up from the tank. You can remove the electric pump from the assembly. I attached a piect of 3/8 brake line to the rubber hose that was used to conenct to the fule pump. I braised the 3/8: line to the pick up frame so it would not move around. Make sure that yo do not allow the new 3/8" pick up to sit below the level where the old pump was or you may stand a chance to pick up junk from the tank o\r even worse plug the new pick up against the bottom of the tank. I ran rubber 3/8" line from the pick up to the new pump. I also braised shut the return line pipe in the top of the pick up as you will not need it. I guess any way that you can plug it up would be good but braising it fixed it for good. I then ran 3/8" aluminum line form the pump to the right side fender wall (Inside the engine bay.) I just followed the original fuel line path. Once I got to the engine bay I mounted a great in line filter canister. I connected the new 3/8" line to the filter and from the filter to the regulator. From the regulator you can use 3/8" rubber tubing or better yet, braided line. It all works well. The only catch is the noise from the pump. I actually don't mind the pump noise. But if that is an issue with you, place a piece of insulating rubber (innertube or some type of professional sound isolating product) between the pump and the frame. This all works really great. If you want to know more, e-mail me and I wil be glad to provide any additional info that you need. Go Carbed! PS. If you are running any carb bigger than a 750 CFM use 1/2" line to insure adequate fule delivery.
Thanks for the help I was thinking of doing it like you said and I am sure I can learn to live with the noise. I was looking at the in tank pickups that replace the intank pump and I just cant live with the 125 dollar price for something that I could make myself. The one other thing I was conserdering doing was putting a bluk head connector in the bottom of the tank just before the back were it angles up. Or making my own pickup out os some alumimun hard line similar to the way you did it.I geuss there is a million ways to do it I just have to pick one that suites me.
Tank Pick Up
What I did was really simple and the only cost was a piece of 3/8" brake line. I would not try to drill and tap into the tank with a bulkhead connector. That just sounds like trouble to me. Once you get your currrent pick up out of the tank, it won't take you 10 minutes to do what I did. I used break line tubing because it is steel and I was able to braise (weld) it to the pick up frame for support. Even if you don't have the capability to braise the 3/8" tubing to the tank support structure, I am sure you could find another way to anchor the tubing. Oh by the way, tubing just connects to the existing 3/8" rubber tubing that connects the in tank pump to the pick up tubing. Can't get any easier than that.
What I did was really simple and the only cost was a piece of 3/8" brake line. I would not try to drill and tap into the tank with a bulkhead connector. That just sounds like trouble to me. Once you get your currrent pick up out of the tank, it won't take you 10 minutes to do what I did. I used break line tubing because it is steel and I was able to braise (weld) it to the pick up frame for support. Even if you don't have the capability to braise the 3/8" tubing to the tank support structure, I am sure you could find another way to anchor the tubing. Oh by the way, tubing just connects to the existing 3/8" rubber tubing that connects the in tank pump to the pick up tubing. Can't get any easier than that.
stangsalwayswin
New Member
It is very easy to use the stock in tank pump. All you have to do is buy a good adjustible regulator with a return line (mallory makes one) and run a 12 volt switch directly to your pump. Easy as cake. Mine has worked this way for years with a lot of street and strip action!
Well orginally I was going to run a mechnical pump the engine is all ready set up for the pump. It was going into my 84 which was carbed from the factory and that would have been real easy but I just got this 89 gt and It has the efi pump so I I figured begin I need to drop the tank to change the pickup mine as well keep a electric pump plus I want to run nitrous later and a electric pump is a little nicer with nitrous but I still ahve to swap the pickup so I was thinking a gravity feed would work better with a external pump. The way I figure the mech pump is 110 bucks with no regulator an the holley blue is 130 with the pump and regulator so what the hell. Its not a real big deal I was just looking at my options.
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