When converting to EFI (throttle body) how does the pump need to be rigged. Engine is about 100hp. Do you just usean inline one, or do you need a return line, etc? Does pump need to be close to the tank, or to the injectors? Any suggestions appreciated. Thanks.
Depends on the injection system, most of the older ones use a bypass regulator that needs a return line. Some newer systems use a returnless system. Most modern cars have the pump in the tank, that's the best place for it. You could probably use an inline pump, but when the tank gets low it can get a gulp of air and make the engine quit (since there is no float bowl).
get the external fuel pump for a 87 bronco, next get a ff3301/g244 fuel filter, 10 feet of 5/16 hose and clamps, run the hose from the tank to where the you put the pump on the frame rail and put the fuel filter right before pump, replace or flare the in and out fitting on the pump, run hose from tank to filter to pump, now you need to flare both the in and the return on the fuel rail for the hose, don't hook it on yet, get a glass gar and whats left of hose, connect the out for the pump to the hose then to gar and block the return of the filter with finger turn the pump on till you get gas in the gar, that's the only way to bleed the system to get gas to there, now run the out on the pump to a fuel presher regulator then to fuel rail, now hook up the return to the side of the filter and use two clamps because its to small for the hose(it will leak non stop if its not tight anufe), I don't know of a 17 psi pump off the top of my head but this 40 psi pump should work for you, I know it will work by it self becase I took the in tank pump out of that bronco, oh and by having return before the pump like that keeps gas by the pump <!-- / message --> <!-- controls -->
Yep, can you give us a little more infoe on what you're trying to do? Hmmmm.... maybe we need to see what he's actually gonna do first.... That fuel pump, though a good choice, is not all things to all injection. Nice choice for some stuff though....
If you have a TBI system it is probably 15 PSI. These are commonly called a low pressure system. The best location for the pump (and the pressure regulator) is in the tank but that may not be easy depending on the design of your tank. I think both Tanks Inc and Rock Valley have tanks and in-tank pump assemblies. If you can't go in-tank there are several TBI in-line pumps that will work just fine. Mount it along the fuel line low and away from exhaust heat. Remember you will need a regulator (and return line) somewhere in the system as well. There may be a pressure regulator already mounted on the engine's fuel system somewhere. In-tank systems usually have the regulator in the tank (or right on top of the tank) and elminate the need for a return line.
That may be the case on late models, but I think that I've only replaced one returnless pump, all the others (a dozen or so) have had a return line and the regulator is part of the injection system.
here I found a external 15-17 psi fuel pump and it a carter P74017, $65 at advanced, it look to be a good kit
I'm putting a TBI fuel injection system on a flathead. I'm using a gmc type tbi throttle body. The venturies are about the same size and almost exact same position as on the 4 bolt merc aluminum intake for a 49 - 53 flathead. They're a little bit further apart on the tbi and the bolt pattern isn't quite the same, so I've got an adaptor made up. The TBI has two 40# injectors, although I don't know yet what fuel pressure they require. I'm also using the stock gas tank, and am hoping to rig a fuel pump in the most trouble free reliable way for this application, I just don't know what that is.
Holley's pump for their Pro-Jection will work nicely. Having a 'bathtub' reservoir in the tank is nice, but keeping it over 1/4 full will work wonders as well. Make sure the pump is below the tank, for siphon purposes, and close to the tank, because it's a pusher pump, and the fuel in the hose will act as a small reservoir, too. Do not use a diaphram-type pump, the pressure pulses will wreak havoc with the EFI. Cosmo
Exactly right. DO NOT waste your time with an external fuel pump mounted anywhere. They will overheat and fail, never at a convienient place or time. Learn it the hard way or not. I replaced 7 of the pos pumps in vehicles I converted to TBI before each of them was converted to an in tank pump...problem solved. TBI should run at 15 psi or will usually go rich and throw a code if higher.
Just out of curiousity (sp?) ? How do you get around/eliiminate all the stock computer, smog vacuums/wires and stuff? TP
The Jalopy Journal
