: Regulator converted to ByPass w/pics


wolf Wengler
12-02-2016, 02:47 PM
http://i918.photobucket.com/albums/ad22/WolfWengler/BypassReg.jpg (http://s918.photobucket.com/user/WolfWengler/media/BypassReg.jpg.html)

This is the inside of a standard $20 holley regulator. I knocked out the check ball and spring and fabricated a plug for that hole. Then I drilled a .180-inch hole in it. (bigger or smaller depends on fuel volume) With a Holley stealth two stage pump I pump between 80 an 125 gph and maintain 6 with one stage or 6.5 pounds with both stages pumping.

I used a slug of aluminum cut from an old x-acto knife handle (the big one) to fit the check ball hole, Perfect fit.

It doesn't have to be a perfect, leak tight fit since the diaphragm will always be open a little whenever the fuel pump is on.

Now the fuel comes in the bottom of the regulator, is regulated by the spring and diaphragm and goes out one of the side ports. Plug the other port or put a gauge in it. Open up the casting a little if you want to smooth the flow. The diaphragm in the regulators a Holley accelerator pump diaphragm.

wolf Wengler
12-02-2016, 02:57 PM
http://i918.photobucket.com/albums/ad22/WolfWengler/BypassReg.jpg (http://s918.photobucket.com/user/WolfWengler/media/BypassReg.jpg.html)

This is the inside of a standard $20 holley regulator. I knocked out the check ball and spring and fabricated a plug for that hole. Then I drilled a .180-inch hole in it. (bigger or smaller depends on fuel volume) With a Holley stealth two stage pump I pump between 80 an 125 gph and maintain 6 with one stage or 6.5 pounds with both stages pumping.

I used a slug of aluminum cut from an old x-acto knife handle (the big one) to fit the check ball hole, Perfect fit.

It doesn't have to be a perfect, leak tight fit since the dhttp://i918.photobucket.com/albums/ad22/WolfWengler/5B1DEF71-BB67-4A4D-A262-0733958E1F33.jpg (http://s918.photobucket.com/user/WolfWengler/media/5B1DEF71-BB67-4A4D-A262-0733958E1F33.jpg.html)iaphragm will always be open a little whenever the fuel pump is on.

Now the fuel comes in the bottom of the regulator, is regulated by the spring and diaphragm and goes out one of the side ports. Plug the other port or put a gauge in it. Open up the casting a little if you want to smooth the flow. The diaphragm in the regulators a Holley accelerator pump diaphragm.

http://i918.photobucket.com/albums/ad22/WolfWengler/2734F138-042B-48FC-BC58-50E7A78D4074.jpg (http://s918.photobucket.com/user/WolfWengler/media/2734F138-042B-48FC-BC58-50E7A78D4074.jpg.html)

kickedafordlately?Yes!
12-02-2016, 03:55 PM
Wolf,

I don't understand how this becomes a bypass regulator, with the modifications as described. Could you elaborate?

It looks to me as all you have done is to change the mechanics of the seal. It appears that it would still be a dead head regulator. I can imagine it becoming a bypass regulator with a few more steps or operations.

I could be way off base, it has been years since I last saw one of those. :smt102

mach9
12-02-2016, 06:11 PM
I thought a by-pass regulator would have to have a return line back to the tank.

wolf Wengler
12-02-2016, 07:15 PM
Wolf,

I don't understand how this becomes a bypass regulator, with the modifications as described. Could you elaborate?

It looks to me as all you have done is to change the mechanics of the seal. It appears that it would still be a dead head regulator. I can imagine it becoming a bypass regulator with a few more steps or operations.

I could be way off base, it has been years since I last saw one of those. :smt102

MY BAD. THE POST IS BACKWARDS: fuel comes in one of the SIDE ports. It pressurizes the underside of the diaphragm against the spring. When it over pressures the spring the diaphragm rises to expose the .180 bypass hole. it releases fuel down that hole and OUT THE BOTTOM. The flow is reversed from original. I should have looked at my own picture.

wolf Wengler
12-02-2016, 07:18 PM
I thought a by-pass regulator would have to have a return line back to the tank.

YEs it does. Comes in the inlet line, goes to the carb, then to the regulator. The regulator keeps 6 pounds (or whatever) at the carb and bypasses the rest out the bottom of the regulator and out the other -8 line back to the tank.

wolf Wengler
12-02-2016, 07:21 PM
I SCREWED UP THE INITIAL DESCRIPTION, BUT IT WORKS GREAT IN REAL LIFE
Comes in the SIDE, goes out the BOTTOM
Two lines to the regulator, supply and return

kickedafordlately?Yes!
12-02-2016, 07:42 PM
MY BAD. THE POST IS BACKWARDS: fuel comes in one of the SIDE ports. It pressurizes the underside of the diaphragm against the spring. When it over pressures the spring the diaphragm rises to expose the .180 bypass hole. it releases fuel down that hole and OUT THE BOTTOM. The flow is reversed from original. I should have looked at my own picture.


Excellent. That is what I thought would need to happen. :smt023