Any cars use Return-less fuel systems?

If so, does anybody make an aftermarket fuel pump for your car? I'm looking for one thats made for returnless fuel systems, apparently they're not that popular in the truck world.

thanks

Nick

if its EFI, you arent going to find much. Most carb systems can be set up to be returnless, but an EFI pressure regulator is mounted AFTER the injectors and the excess fuel is returned to the tank. If you plugged the return line, the pressure would be determined by how long the injectors were open in a given time. So the pressure would be really high at idle and lower at full throttle. It needs to have a steady fuel pressure though, because the injector open time is calculated using that pressure.

I've never seen an EFI system that works without a return. Lots of carb systems (usually aftermarket carb systems) can be set up this way though. Not saying it doesnt exist for EFI, I'd just need an explaination of how the ECU would determine pulse width without regulated pressure.

returnless fuel systems. wow thats a funny one. hmm yeah all cars and trucks before the fuel injection era are a fuel return set up. what are you tryin to do? is your car fuel injected? cause just about every fuel pump manufacture out there can help ya. holley, BG, edelbrock, they all make fuel ppumps.. you need to explain what your doin if you want help

its for my 1998 ranger, 2.5L fuel injected with a returnless fuel system. they had the 2.5 w/ returnless available for 3 years then scrapped it. i've heard of a few other fords (cars) with returnless systems as well, but havn't found any aftermarket pumps for them...

i just know that i know nothing about fuel systems haha other then this one is returnless

The PCM responds to inputs from the fuel pressure sensor and other sensors, then adjusts the fuel pressure hy changing a pulse width modulated voltage supply to the fuel pump. The fuel pump either speeds up or slows down, based on what the PCM believes the engine s fuel needs happen to be at any given time. In this way, fuel pressure across the injectors is maintained at approximately 40 psi, referenced to the engine s manifold absolute pressure (MAP).

seems like you can use any fuel pump for this type of system, seeing as it just modulates the voltage going to the pump. Some cars use two speed pumps, like RX7's that drop fuel pump voltage to 9v under cruising conditions to keep from flooding the engine. Its not a special pump though, just a standard Carter pump, so I dont see why you couldnt modulate the pump volatge on any pump. The pressure sensor would "see" the target pressure and adapt the pulse width, so no need to use a special pump either..

Its the term "pulse width" thats getting me though. I dont know how a fuel pump would handle consistent on off pulses instead of a constant input. It would be worth looking into.

http://store.summitracing.com/default.asp?target=partdetail.asp&autofilter=1&part=MSD%2D2225&N=115&autoview=sku
That one is "supposed" to be returnless, I havent tried it myself.

You might be better off making it return instead of returnless. I never seen this before but not sayings its not true. I thought every car had a return fuel line to the tank. If i was you I would make it return back to the fuel tank and now worry your self about the trouble


Life looks better at 100mph on the back tire..

That modulated voltage shit scares me off a bit, I'd go with a stock pump just because I'd imagine that these aftermarket pumps just wouldn't be designed for that constant changes in pump speed, they are made for on/off... not saying it wouldn't work, but I'd probably call the manufacturers' tech line before shelling out some dough for one just to have it burn up quick...