PMO Fuel Regulator/return line question?

[DCOP]

I am looking to re-plumb my fuel lines to my Weber's. Thinking stainless braided and AN fittings. I have a low pressure system without a return line. I just had a new fuel pump installed that puts out about 5-9 PSI according to my mechanic. He placed an inline regulator, gauge and splitter to the carbs but it is really half-A$$ed and looks like a house plumbing fixture. I'm thinking of redoing it as it is not very secure and have already had a fuel line leak issue! Another story but could have been disastrous! I really like the PMO set-up from our host but I don't have or think I need a return line. My question is; can I use the PMO fuel regulator set-up and plug the return line port? Or does anyone know where I can get a splitter type block with a mounting bracket similar to the PMO without a return port?
Cheers,

Darryl

[RoninLB]

I used a good $100 Mallory dead head regulator that has two discharges

The $20 Holley has one discharge and has a single diaphragm

[cfries]

I am running PMO's on my setup and couldnt find the return line. Running it with a Y connector as opposed to a T connector. PMO's run fine and fuel pressure is on par with Richards recommendation. Still searching for the return line, then maybe I can install the regulator. Hope this helps. I can post a picture of the setup later if you'd like.

[DCOP]

Just worried if I block the return line port that I may have problems regulating the pressure output to the carbs? I can find a "Y" piece connector but the PMO regulator is a lot neater and cleaner when plumbing with AN fittings and stainless lines...anyone else done this?

[steve911T]

I do not have the return line because it was not available in the non MFI cars (at least I cannot find it). I have the return line from the PMO regulator blocked off and am just interested in reading the pressure and have had no issues for the several years that it has been in. Steve

[DCOP]

Thanks all....I think I will go ahead and try the PMO and plug the return port Can't be any worse then the work my so-called "Porsche Certified" mechanic did. Trying to get it right this time so I don't have to worry about it again!

[KTL]

I have my setup done in braided at the fuel cell and the supply line from the fuel cell to the regulator in the engine bay. The line coming from the regulator (sorry, it's just a 3 port Holley w/ no return) is done with rubber/Aeroquip Socketless hose.

I did that because I too like the braided stuff for safety & abrasion resistance as well as the AN fittings. I did the Socketless because I like the AN fittings instead of barb fittings and hose clamps. Much easier to disconnect AN fittings vs. rubber hose.

I also did Socketless because it lets you see the condition of the hose with age. One downside to braided is you can't tell how the hose is aging. My car came with all braided and some of the lines were stinky and crackly from unknown age. The braid looked fine but my car always smelled too much like gas fumes. Checked for leaks everywhere and finally traced it to the age of the hose. You could smell the stink on other stuff like wiring harnesses that were bundled with the fuel hose. Not very good from a safety standpoint.....

[James Brown]

yep on aircraft there should be a metal tag attached to the hose that says when it was manufactured and assembled. Depending on the hose and PSI, they last anywhere from 5-12 years. Keep that in mind when choosing steel bradded hose vs rubber hose.
on my carb project, i used gates USCG marine grade fuel line that is good with alcohol fuels and has a liner to prevent fuel permeation and good quality fuel injection clamps.

[aerodyn930]

Hello. I believe the PMO regulator nedds a return line to function properly, Excess press is returned to the fuel tank, I recommend running it with a return line as the cooler fuel available to the carbs will provide more consistent metering plus reduce the chance of vapor lock, Also for adequate fuel delivery across the rpm range this setup will work much better ,

For a '70 T you should find in the area of the fuel tank outlets a fitting that will accept a return fuel line,

Hope this helps, Lou

[BoxsterGT]

For proper pressure regulation you need a return line back to the tank.

Here's what we have used with all Metric hoses & fittings that work as intended.........



Its on a 71S w an EFI conversion, but the principle is the same, keep the fuel circulating and cool.





Len

[James Brown]

low pressure fuel pump (+- 5 psi) like you have can use the pmo regulator without the return. It will only allow the regulated pressure to the output side. the engine compartment stays relativity cool to prevent vapor lock at low flow conditions. Fax Richard Par at PMO to double check. I would use a return line back to the tank if your using a fuel injection pump.

[GG Allin]

As long as we are (were) on the topic, I' trying to figure out how to convert my stock supply and return lines to AN in order to hook them up to my PMO FPR. I was thinking about cutting the flexible portion off the return line and putting on a compression fitting to AN adapter. I don't see any that are metric though. For the the supply side I would need something to go from the top of the fuel filter to the FPR.

This seems like this should be easy....but.

[BoxsterGT]

GG Allin -

For your 3.2 Carrera I have the adapter fittings you need.

My Direct Connect fittings allow a Feed Line over to the AN-6 PMO Regulator....



and a Return back directly to either your Green Steel Return Hardline or the Return at the Tunnel.


Available in E-85 Rubber or E-85 Braided SS.

I also have the correct Metric Compression Ring fittings if you want to cut your hardlines and connect there.




For Info, please email me.

Len.Cummings at verizon.net