Fuel pressure regulators

[fordor41]

So Lanny, you would rather use a reg. that the manufacturer knows will "weep" gas and has an engineered escape path built into it than use the round type that "may" leak sometime?
You may have had a leaker but how many guys have had a leaky carb? Do they throw the carb out because theirs leaked? Almost every carb will leak sometime. Now what. change to FI?

[Lanny]

I would rather have a weep hole, where I can direct the spray, if the diaphragm
starts to leak rather then no weep hole, and the gas comes flying out, in large
amounts from underneath the center dial, and it sprays all over the place.

And, do you know that you can't even buy a diaphragm for that POS
round dial regulator. That's how chinzey they are made.

Your choice, but maybe some will heed the warning about those fire hazard regs.








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[A bones]

Hey Hi Lanny, thank you for sharing all that info. Nice work with the picture. Great to know what you have learned. Glad the worst was avoided.

My present 'system' is a can and a hose.

I have an intense aversion and loathing of uncontrolled fire. ( yea, I used a dictionary )

Good job.!

[glennpm]

Does the Holly regulator burp gas often? I'm wondering if it would be worth it for me to modify the notch by epoxying in a small and short tube or 3/16" brake line after prep with a grinder and or drill. I'd then extend it with rubber hose to the bottom of the motor.

Thanks

[Mart]

If you have an old fuel pump, fit the spring from that into the one you are currently using. That should lower the pressure a bit. Make sure the needle on the carb is the older (steel tipped?) type, not the rubber.
That should stop any flooding issues.
Using the electric pump to prime the carb before starting should not cause any issues unless you leave it on permanently.

Regulators are best avoided unless absolutely necessary.

That said, I have one of the malpassi filter/regulators on my roadster. It is a good piece of kit. It was also marketed under the "filter king" brand name.

Mart.

[glennpm]

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Hi Mart,

I have only an electric pump. The modification to the manual is a good one but not for me.

Thanks

[Lanny]

Originally Posted by glennpm

Does the Holly regulator burp gas often? I'm wondering if it would be worth it for me to modify the notch by epoxying in a small and short tube or 3/16" brake line after prep with a grinder and or drill. I'd then extend it with rubber hose to the bottom of the motor.

Thanks

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hi Glenn, when the regulator burps fuel, it is because the diaphragm has
sprung a leak and Must be replaced.

Diaphragms can crack from age (getting hard or dry) OR from too much
alcohol blended into the gas a person uses.
Try to run alcohol free gas if you can. Do a search to see who has
it near you.

On many of the New regulators, I have heard that if the diaphragm leaks,
it will just push more gas thru the fuel line, and NOT spray any gas out.

I would rather have a weep hole in the regulator, and direct as safe a place
as possible for the gas spray to go out, rather then puch it thru the carb.

Maybe you could take the top off your regulator, and figure out how it
functions, and see if it's possible to make a good weep hole.

Let us know what you figure out,,,,good luck








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[glennpm]

Hi Lanny,

Thanks for your reply. I wish I could buy ethanol free easily in Maine but it is extremely difficult to purchase. It is much easier in my winter home in North Carolina.

I took the bonnet off of my new Holley regulator today and see that it will only bleed out if the diaphragm starts failing as you mention. The pressure adjustment lock nut was on so tightly that I was afraid that I was going to crack the housing getting it off.

I have a few pieces of 1/4" brake line tubing and have planned a drain line. I'll post pictures once complete.

Thanks!

[Vic Piano]

I convert the OEM fuel pumps on my Flatheads to 'pass through' pumps and run electric fuel pumps as the only fuel pumps. I run Airtex in both 6 and 12 volt vehicles. I also use the Mr. Gasket (brand name) with the dial adjustment. I've had them on four of my Flatheads for a good number of years, and I've yet to have a problem with them. I also install a 'kill switch' for the pumps and leave the fuel pump push rod in the block. I carry a "known to be working' mechanical fuel pump in a vehicle when I take it on a road trip, just incase there is a problem with the electric pump or fuel pressure regulator. Happy to say, I've not had to swap one out yet. Can't say that about mechanical pumps...

[glennpm]

Okay I did it this morning with a piece of 1/4" brake line I had around. I located and tapped a 1/4-28 thread into the diaphragm bell. I used thread sealer on the brake line to bell thread, ground down and radiused nut to lock the brake pipe and will slip a 1/4" rubber hose over the end to route it down below the engine etc.

[19Fordy]

Nice job, Glenn.

[glennpm]

Thanks!

[Robz51]

On the Holley. What is the hole on the bottom for (with red plug in photo)? I have one like that but the instructions aren't great. I thought it was for a gauge but now I'm confused.
Rob

[glennpm]

The bottom is the inlet. Top has two outlets. I'm using one for the pressure gauge.

[mike42]

Listen to Lanny about spraying fuel all over the engine compartment ! 3 years ago on the hottest and muggiest day of the Summer in Northern Michigan .......the Mr. Gasket Dial Reg decided to let loose. I had 5 miles to get home and couldn't get there fast enough. I went with the Holly and a small round gage and absolutely no probs since. I was able to set at 2.5# and have not touched it since.

[Lanny]

When my Dial Regulator sprung a leak, I'm glad i had the hood open, and could
jump in and shut my switch off quick, as it was spraying gas Everywhere.
I grabbed my fire extinguisher from my shop, as gas was still dripping on my
hot exhaust pipe. I'm glad I wasn't driving at the time.

I called the big auto parts supplier where I had bought it a couple years earlier,
and the guy said, there was NO diaphragm made for my Dial regulator. so I
asked him, what the heck am I suppose to do with it, as it was only a couple
years old, the guy said, Throw it in the garbage, where it belongs.

Things could have ended a lot worse, so I got a cheap lesson that day.









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