Fuel Pressure regulator

[rommaster2]

Ok well i was reviewing the idiots guide to turbocharging the falcon six and it suggests an adjustable fuel pressure regulator which makes sense to me but I don't know how to select it properly. Basically where i am stuck at is the range that they adjust, most that i saw on summit were between 30-120psi or something like that. Now the reason that confuses me is i see the majority of non adjustables at like 8 psi. Would the adjustable one being that high allow me to use a two barrel NA as well for tuning purposes or would it only work well on the turbo as it would need more fuel pressure.

Also is there anything particular i should watch out for when picking out an electric fuel pump?

 

[XFlow_Fairlane]

get a EFI fuel pump and two things on the regulator...

bypass style (has a return)
and manifold referenced (common on most EFI regulators)

I ended up with an Aeromotive one that came with springs for both carb and EFI use and has worked great. cost was about $100 from my local speed shop.

I was running a stock GM efi fuel pump in a mini tank.

 

[rommaster2]

Running the bypass style i will have to plumb a return line to the tank correct? Is there any easier way then welding one on, like a T in the line or something *shrug*, I ask just because I hate draining the tank and pulling it out, not hard to do just draining is annoying.

 

[Does10s]

ronmaster2,
An easy way to do the return fuel line is to put it into the filler neck.
You can remove the metal portion of the neck and drill/tap/JB Weld or weld a bung on there. Then just route the fuel line to it.

As for the regulator we're using a Mallory 4309. It can regulate down to carb levels (5-6psi), and we've had it up to 22-24psi under boost.
It's worked well for us!

Will

 

[rommaster2]

I would have never thought of the filler neck idea, that would definetly be a bit easier to work with.

Also thanks for the psi reference, that was what confused me. I will compare the mallory that you say you guys use to the one previously suggested and see which i like better.

 

[XPC66]

You can just put the bypass around the pump

 

[rommaster2]

What do you mean by around the pump? You mean on the backside?

 

[XFlow_Fairlane]

http://store.summitracing.com/partdetai ... toview=sku

the reg I am running.

I got it local for under $100 though.

 

[XPC66]

What do you mean by around the pump? You mean on the backside?

Yes you can route the regulator bypass to the intake side of the pump. You just need to use a precision regulator.

 

[XFlow_Fairlane]

just return it to the filler neck. I think someone even makes kits for it (a sleeve with a nipple you splice in)

I tried goign cheap on the fuel system as have others here and it all came back to this.....

run an EFI pump and return regulator.

do it right and be able to sleep better a night knowing that will not be a problem.

 

[rommaster2]

Yeah i was talking to some friends (one runs a turboed 240, and the other a supercharged grand prix, plus the gran prix owner used to work at a custom speed shop) both reccomended the filler tube.

So i already know the vacuum line for the fuel regulator requires the regulator to be somewhat near the vacuum source, so should i just run a long return tube all the way back? Also it is probably best to mount the fuel pump near the gas tank as well i'm assuming (running stock tank) as electrics are not pullers they're pushers right?

 

[XFlow_Fairlane]

I would run a new supply that is larger (3/8") and use your old supply for a return.

if you can figure out a way to seal it you could pass two wires through your sending unit plate and trim the pickup tube back and run an intank pump.

 

[Does10s]

So i already know the vacuum line for the fuel regulator requires the regulator to be somewhat near the vacuum source, so should i just run a long return tube all the way back? Also it is probably best to mount the fuel pump near the gas tank as well i'm assuming (running stock tank) as electrics are not pullers they're pushers right?

Put the regulator in the engine compartment and run the return line all the way back to the tank.

As for the pickup, I removed it from the tank and bent a 1/2" dia. steel pipe in the same basic shape as the little 5/16" one. Then just cut the old one out and replaced it with the 1/2" fuel line. Then welded on a -8 AN fitting on the end of it to hook up the fuel pump input line.
Mount the pump as close to the tank as possible and make it as low as possible. ie below the fuel level.

Xflow_Fairlane has a good idea about the tank pump!

Either way you're doing some fabrication!
Later,
Will

 

[rommaster2]

Yeah it sounds like i will end up dropping the tank either way , oh well at least i've figured out if i gather all my parts togethor for the five lug + disc brake +t5 swap i can take it to school and get it all done in a day on a lift.

Well I will probably drop the tank and modify the sending unit, perhaps I might even weld in a return line onto the sending unit if theres enough space, or I will run it up to the filler line.

 

[addo]

There's a stack of room on the sender plate for modifications. You should be able to access it from under the car.

Why not buy another sender and have it modified, then swap over? Use Permatex #3 or Blue Hylomar to tack-glue the new O-ring in place on the tank when reassembling.

 

[XFlow_Fairlane]

jsut run it to the filler neck.

the sending unit is pretty small so trying to fit the three wires and a large tube into it might be a little tough....tossing another tube might be too crowded.

I would give it a go with a couple nylon bushings and washers and a brass bolt. get a couple orings to put in there and it should do the trick.

if you have access to a lathe it will be super easy.

if i remeber maybe I will look into getting something setup with some mcmaster parts and just buy them in bulk and sell them as kits on here...

Intank is really a great way to go. most stock intank pumps will provide plenty of fuel for a carbed turbo setup and the larger ones don't cost that much either.

 

[rommaster2]

Yeah if there was a kit for a in tank one that allowed use of the guage still i might check it out but I think i will just hook up a external one for now on it after modifying for more flow, though isn't the stock fuel line 3\8? shouldn't that be all i would need for a mild turbo application, i'm not planning on running tens here .