fuel pressure regulator install?

[3rdelke]

Well, the saga continues...While waiting for pushrods to finish upper valvetrain, thought we needed to address the plumbing for the dual quads. we have a high volume mechanical pump, so I bought a cheap fuel pressure regulator with gauge. no instructions were included. do they all require a return line? and does anyone have a simple diagram? I have a little trouble loading pdf files, but that is just one more of the many things I don't understand. thanks, Bob

 

[kevin403]

You can only use a return line if the regulator has a port for one. Which reg do you have.

 

[moparsteve636]

If it is a 3 port reg. You can't use a return line! 1 is inlet and the other 2 are too the carbs

 

[3rdelke]

here is photos

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what is the 1/8 inch port for?

 

[kevin403]

1/8 is for test port gauge. Bottom should be inlet. With 2 outlets, one with gauge looks like has been used.

 

[3rdelke]

kevin, forgive my ignorance, test port? the top seems to be the adjustment screw. if the bottom is the supply the port opposite the gauge must go to carbs. that makes sense. all but test port, just cap it off?

 

[kevin403]

kevin, forgive my ignorance, test port? the top seems to be the adjustment screw. if the bottom is the supply the port opposite the gauge must go to carbs. that makes sense. all but test port, just cap it off?

Do you mean the barb fitting in the pic? On the reg there is usually a plug on the test port for a pressure gauge. It's option. Look at the quick fuel. Should be relatively the same.

http://www.quickfueltechnology.com/fuel-pressure-regulators/low-pressure-regulator.html

 

[snakeoil24]

here is photosView attachment 293997View attachment 293998

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what is the 1/8 inch port for?

You have a vacuum sensing port and do your self a big favor and replace those aircraft barrel clamps with fuel line cplamps which have rolled edges and no holes for screw.

 

[3rdelke]

snakeoil, thx, i'll look for those clamps. so just cap off the vacuum fitting? is it for tuning?

 

[Grabinov911]

snakeoil, thx, i'll look for those clamps. so just cap off the vacuum fitting? is it for tuning?

That should be a vacuum / boost reference port. It's helpful if you're running forced induction like a turbo or a blower so that you a can increase fuel pressure as boost goes up. It would be connected to a vacuum port if you needed it. Otherwise it's just capped.

I'm just learning this stuff myself for my project.

 

[Badvert65]

The small port is a 'Boost/Vacuum Reference Port' Are you certain of the fuel pressure range of that thing?

 

[3rdelke]

i think these two 750 AFBs are supposed to be set a 4 lbs?that would be the red scale?