Fuel Pressure Regulator

[macloft]

Hi Brains Trust
I have finished installation of the fuel tank, pump, boot lock and Fuel filler system. Now to hook it all up to the engine Soooo Question.
Where to locate the fuel regulator for the LS1 motor and what type of regulator to use.
Do I locate the regulator in the boot area (nice and neat) close to the pump or up in the engine bay close to the injectors. What is the best position???
And what is the better regulator Mallory/ Holley etc and where do I buy it from in Brisbane??
Thanks

[Leeroy]

I used a Malpassi rising rate regulator and mounted it up need the fuel rail. Not sure if location is critical but probably want shorter distance of fuel run after the reg to rails in case of any pressure drop due to distance.

[Gav]

I have used a reg bought from Ebay. It was flogged as being the same as a sard.
Mike and Phil N have both used sard regulators so I thought it would be a good place to start.
I have a 3/8" line up from the tank, a stock commodore filter on the passenger footwell that then feeds the fuel rail. I have bronzed a 5/16" barb into the drivers side rear of the fuel rail and from there go to the regulator that then feeds back to the tank.
There is a pic in my gallery of the engine bay with the fuel lines fitted, its a bit dark but you will get the idea.

[pneall]

I went for Sard regulator and mounted it on the end of the fuel rail. They are fairly small but easily handle the flowrate.A pressure gauge is also required as the ECU is programmed for injectors running at a set pressure. I think its 52 psi.

Phil

[Plums]

Standard LS1's have the regulator near the fuel pump (in the same plastic cradle in fact) and run fuel out through the fuel filter, then back to the tank via a T-piece in the line.
There is only one fuel line running to the engine bay. This fuel line is high pressure.

If you are going to set-up a return style system, you should have the regulator somewhere in the engine bay, (or up the front somewhere) after your fuel rail of course. This way you only have one high pressure line running the length of the car, (anything after the regulator is low pressure).

Standard LS1 fuel pressure is 59 psi.

[Aussie Mike]

You can install the reg back near the fuel tank if you don't want to run a full return system. It is handy having the reg and guage in the engine bay as you can easily check and adjust your fuel pressure.

A non return system is pretty much how the stock LS1 fuel system works. The regulator is actually inside the swirl pot. A single line runs from the tank to the fuel rails. You could duplicate this setup fairly easily with an external regulator. The disadvantage with a single line non return system is that the fuel sits in the line and the rails and soaks up the engine heat. A full return system always has fresh cool fuel circulating from the tank. It will pick up a bit of heat from the pump but not as much as from the motor.

I'm running the Sard regulator like Phil N and others and they seem like a good unit. They are very popular with the Japanese turbo Supra and Skyline crowd.

I've the regulator mounted on the firewall with a liquid filled pressure guage attached. You can see from this pic where the main line from the pump runs into the back of the passengers side rail. The fuel runs down one rail across and back up to the other where it's connected via a line to the regulator. The regulator bleeds off excess pressure to the return line back to the fuel tank and maintains the set fuel pressure in the rails.



Hope this helps

Cheers

[boxhead]

Just like the Supra and Skyline boys hey Mike, Sounds like you are a wanna be Ricer

[Aussie Mike]

No Pshh! Phhh! or Doof! Doof! for me thanks Boxhead. I'll take Vroom! Vroom! and Squeal! Squeal! thanks.


It's just those guys seem to ring the tits off their engines with loads of boost to make their HP. I figure reliable fueling for them is very important. A lean turbo motor is usualy a broken motor.

Cheers

[macloft]

Ok Guys thanks for the help. Now Mike back to your garage I am sure you still have things to do. Everytime I see the picture of that manifold and downdraft throttle body I have to force myself not order one (bloody lovely).