Fuel Regulator for Custom Injection

[markandson]

Below is a link to a 3 port regulator, that says it is specifically for racing applications. I know it is good for gas and alky, but other than that, what is it that makes it for racing? It looks like the perfect thing for my 2.2 EFI system, it would be used with a jegs EFI fuel pump.



Mallory Racing Regulator - JEGS

[Nathan Acree]

This would be OK for a carb setup, but the regulator is not for EFI fuel pressures (generally 30psi and above).

-Nathan

[saxybiker]

You may wish to check Summit Racing. I used one of their house brand fuel regulators with a terminal block to mount a pressure gauge and I think all of that together was less than $100.

What makes the Mallory unit a "racing" unit is that it clearly says "Mallory" on it and you get the decal to stick on the side of your car! (just kidding).

Mallory usually makes good equipment. I used a Mallory distributor for Vickie's Custom car. Works great!

Allen

[saxybiker]

Nathan's correct. I believe the Summit unit comes in either low or high pressure types.

Allen

[namba209]

Why do you need a rgulator? There is a pressure regulator in the fuel rail already. On Willit? I used a 70 psi three port pump that had an internal bypass and bleed port that continually cycled fuel to keep it cool, feeding the fuel rail that bled pressure in excess of 50 psi back to the fuel tank. Of course the Opel FI uses lower pressure but the principle is still the same. Use a pump that has a bit higher pressure than the fuel rail regulator and you have fuel cycling through the pump to keep it cool. JMTCW.

[markandson]

The Mallory unit comes both for Carbs and EFI, naturally I was referring to the EFI model, but their website defaults to the carb model when you put in the model number of the regulator. My fuel pump is only in and out, so I do need a regulator to go with it with a return back to the tank. Also I am not using anything standard in my engine. Valves, Rockers, Cam, Pistons, EFI unit, pump, regulator, fuel rail, injectors, intake manifold, etc. etc., are all custom. This will sort of look like an Opel engine from the outside, but inside will be a whole 'nother story.

[namba209]

My mistook Jeff, I was under the impression you were using a stock EFI system. The regulator will work just fine once you set it up for the required pressure. The big thing IMHO is to have the fuel pump put out just a bit more pressure and volume than you will need, so the regulator will be in a continual bypass or bleed mode to keep the pump cool by the fuel flow.

[RallyBob]

Any OEM (Bosch is fine) EFI regulator with an 8-10 psi bump (36 psi base increasing to 44 psi under load/low vacuum is pretty much standard) will work fine, or you can get fancy like I've done and grab an Aeromotive adjustable regulator. This allows the baseline pressure setting to be bumped up should you modify the engine further and start starving the engine for fuel, without the added expense of buying larger injectors.
This is my favorite Aeromotive regulator, I've used it in a lot of applications.

So Jeff, really any vacuum-actuated in/out EFI regulator from a junkyard could probably be adapted.

Bob

[davegt27]

I have one of those (i know it would help if i finished a car and put it on)

it comes with three springs so you can set it up the way you want

adding an AFPR can be a painful affair (hunting down all the fittings and stuff)

but its almost mandatory for a non stock FI car

i put one of these on my Toyota SC project a few weeks ago


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don't forget to get an FP gauge so you can set up your system

good luck
Davegt27

[markandson]

So Jeff, really any vacuum-actuated in/out EFI regulator from a junkyard could probably be adapted. Bob

Yea Bob, but after all, you sort of know me a little bit by now and something from a bone yard just isn't my style unless I can't get it new, so off to the bank I go to get some more $ to sink into this deep deep project hole .
You might not believe what I just sent Roger for doing my head, I have to be out of my friggin mind. This engine is going to be worth about 6 to 10 G's by the time I am done. Looking back I think if I knew I might have sprung for the 16V job from OGTS. Too late now.

[RallyBob]

Originally Posted by markandson Yea Bob, but after all, you sort of know me a little bit by now and something from a bone yard just isn't my style unless I can't get it new, so off to the bank I go to get some more $ to sink into this deep deep project hole

Jeff, here is a cheaper option, it is in fact a modified Bosch unit sold by MSD.

Bob

[Paul]

Bob,

Can either of these 2 regulators you've mentioned above be used on a stock 75 FI system to provide a steeper fuel pressure curve, like as a rising rate regulator?

thanks

[opelbits]

Originally Posted by namba209 "an internal bypass and bleed port that continually cycled fuel to keep it cool, feeding the fuel rail that bled pressure in excess of 50 psi back to the fuel tank. Of course the Opel FI uses lower pressure but the principle is still the same. Use a pump that has a bit higher pressure than the fuel rail regulator and you have fuel cycling through the pump to keep it cool. JMTCW.

This is not meant to hijack the thread, but I think this little tidbit is the last piece in the vapor lock/hot start puzzle. There are fuel filters with a smaller bypass port, correct? A little creative plumbing work and the recirculating fuel idea will work even on the carbed cars regardless of pump type. This may be why, no matter what other steps you take, the fuel still heats up. At low rpm in slow traffic or sitting still, the fuel in the lines near the motor is not moving. It is just sitting there absorbing heat.


To sort of keep this post on topic...
For racing applications, wouldn't the regulator allow for much higher than stock flow? 1/2" or 3/8" lines in place of 5/16". Maybe even be built to handle greater pressure differentials experienced in racing that are not encountered on the street, even in many modified motors. All of this is assuming the usual US V8 as the normal market for Mallory and Jeg's.

[markandson]

Originally Posted by RallyBob Jeff, here is a cheaper option, it is in fact a modified Bosch unit sold by MSD. Bob

I liked the first suggestion much better and have ordered it along with a fuel pressure gauge. I now have a pretty good collection of stuff toward building my engine....still no car . Bob, I might enlist your help to decide on pistons to go with my Roger Wilson head if you have the time. Will let you know when it shows up.

[markandson]

Got the AEI-13105 Aeromotive regulator yesterday, from Summit. What a beautiful little unit this thing is. It is so small, the literature on the Summit site does not fully describe its size, other than that it is small. This thing is 3" high and only 1 3/4" in diameter. Comes with a sweet little mounting bracket and I also bought the pressure gauge by Summit that is recommended when you buy the regulator. The gauge is liquid filled and is small enough to be able to screw it directly into the gauge port on the regulator. Thank you RallyBob for the suggestion .