Printable Version of Topic
Click here to view this topic in its original format
914World.com _ 914World Garage _ Where to mount the Fuel Pressure Regulator
Posted by: PanelBilly Dec 15 2014, 11:54 PM
Im looking for suggestions on how to plumb the fuel lines for the PMO carbs. Where should the regulator be mounted?
Posted by: Socalandy Dec 16 2014, 01:04 AM
I dug this picture up from when the engine was installed. Clearly a cell phone picture 
Attached thumbnail(s)
Posted by: Mark Henry Dec 16 2014, 06:53 AM
Doesn't really matter, but where ever you mount it make it easy to see the gauge, easy to get at the adjuster and not in the way for working on the engine. I've also seen it mounted on the back trunk firewall between the carbs.
You could take the gauge off and mount it to the PMO fuel bar.
I'd run your fuel lines in a loop like on FI systems.
Posted by: stugray Dec 16 2014, 09:21 AM
In my current configuration, I have the regulator up front with the pump and a gauge in the back with the carbs.
I figured it would be just a little safer having 3 PSI fuel running to the back through the tunnel instead of 12 PSI.
But after using it this way, the fuel pressure is not very consistent.
So I plan on moving the regualtor to the back with the gauge & the splitter right before the carbs.
Posted by: slivel Dec 16 2014, 11:32 AM
Two regulators - one in front reducing the pressure to about 12 psi. Second one in engine bay on firewall reducing pressure to 4 psi. This has served me well for about 10 years.
Posted by: SLITS Dec 16 2014, 12:17 PM
Two regulators - one in front reducing the pressure to about 12 psi. Second one in engine bay on firewall reducing pressure to 4 psi. This has served me well for about 10 years.
Wow, you used a REAL pressure regulator not the BS PMO one.
Posted by: Mark Henry Dec 16 2014, 01:16 PM
Wow, you used a REAL pressure regulator not the BS PMO one.
I'm using a Malpassi fuel regulator on my build.
Posted by: 914Timo Dec 16 2014, 02:05 PM
Wow, you used a REAL pressure regulator not the BS PMO one.
Whats wrong with PMO regulators ? Are they not good ? I was just going to order one. Should I buy some other ? What's good ? Aeromotive ? At least they are expensive
Posted by: Mark Henry Dec 16 2014, 02:27 PM
Wow, you used a REAL pressure regulator not the BS PMO one.
Whats wrong with PMO regulators ? Are they not good ? I was just going to order one. Should I buy some other ? What's good ? Aeromotive ? At least they are expensive
Ron must not like them
The Malpassi fuel regulator I'm using is favored by a lot of weber shops (Pierce Manifolds, aircooled.net, UK speed shops, etc) and should be easy for you to find in Europe. They came stock on a few cars over there as well. Made in Italy.
They are real small, less than 3 inches.
Posted by: 914Timo Dec 16 2014, 02:45 PM
The Malpassi fuel regulator I'm using is favored by a lot of weber shops (Pierce Manifolds, aircooled.net, UK speed shops, etc) and should be easy for you to find in Europe. They came stock on a few cars over there as well. Made in Italy.
Thanks Mark. Malpassi doesn´t have very good reputation here. Maybe because they are made in Italy
But, I have to say I had Malpassi in my ´63 Beetle with dual Dellortos and zero problems with fuel pressure.
Posted by: SLITS Dec 16 2014, 03:14 PM
Wow, you used a REAL pressure regulator not the BS PMO one.
Whats wrong with PMO regulators ? Are they not good ? I was just going to order one. Should I buy some other ? What's good ? Aeromotive ? At least they are expensive
When you use a "safety collar"** to clamp down on a rubber hose and restrict fuel flow, it just seems mickey mouse to me. Why not use vise grips?
We used the Holley/Mr. Gasket fuel pressure regulator on the race cars and I bought them for street cars. They looked much like the ones in the picture.
**very similar to ones on the tensioners in a /6 engine to prevent total collapse.
And you are right ... I don't like them!
Posted by: 914Timo Dec 16 2014, 03:33 PM
When you use a "safety collar"** to clamp down on a rubber hose and restrict fuel flow, it just seems mickey mouse to me. Why not use vise grips?
And you are right ... I don't like them!
Ok. Thanks. I agree. I am not big fan of rubber hoses and hose clamps too.
According http://www.pmocarb.com/parts.htm you can buy the regulator with AN-6 fittings.
Posted by: SLITS Dec 16 2014, 03:47 PM
When you use a "safety collar"** to clamp down on a rubber hose and restrict fuel flow, it just seems mickey mouse to me. Why not use vise grips?
And you are right ... I don't like them!
Ok. Thanks. I agree. I am not big fan of rubber hoses and hose clamps too.
According http://www.pmocarb.com/parts.htm you can buy the regulator with AN-6 fittings.
The one we installed on Glenn Sager's 3.0 conversion uses what I described above. If they have different ones I do not know. I'll add an image to this post in about 20 minutes.
http://s239.photobucket.com/user/professor914/media/DSCN8872_zpsa071eee3.jpg.html
Installed on the back firewall, between the carbs.
Posted by: Mark Henry Dec 16 2014, 04:31 PM
That must be very early, the ones I see now don't look like that. They have a big chunky body with a brass adjustment screw and lock nut like in the first pic of the thread.
Posted by: patssle Dec 16 2014, 04:48 PM
Or...use a fuel pump that pumps at 3-4 psi and avoid a high pressure fuel system and regulator.
Posted by: Mark Henry Dec 16 2014, 04:53 PM
Or...use a fuel pump that pumps at 3-4 psi and avoid a high pressure fuel system and regulator.
I don't know of a single pump that I would trust to do that.
Posted by: SLITS Dec 16 2014, 04:54 PM
Or...use a fuel pump that pumps at 3-4 psi and avoid a high pressure fuel system and regulator.
We did that first. Mounted in the front, it wouldn't produce enough pressure to move the gauge needle. Switched it to a single in / single out DJet pump and now we have appropriate pressure at the carbs.
No kinked lines, SS supply and return.
Want a 3.5 psig pump that was run for a total of 15 minutes?
Posted by: patssle Dec 16 2014, 05:27 PM
http://www.cbperformance.com/ProductDetails.asp?ProductCode=3193
Running it on my 3.0L...ran it for 5 years on my /4. Tad low on the pressure at 3 PSI (v.s. 3.5) but works great! Hell I even used my backup pump this weekend to pump out my generator into my car for fresh fuel.
Posted by: yeahmag Dec 16 2014, 06:53 PM
I use the same one. I'd love to start data logging that with my LM-1.
Posted by: Socalandy Dec 17 2014, 12:29 AM
here's the instructions with in and out layout
Attached image(s)
Posted by: PanelBilly Dec 17 2014, 12:34 AM
That's perfect. I guessed the 2 lines in the face were out, but assumed (wrongly) that the side ones were equally in and return. Now I can see that one is devoted in and the other return.
Powered by Invision Power Board (http://www.invisionboard.com)
© Invision Power Services (http://www.invisionpower.com)