please please please

electical gurus come on ...is wednesday allready.i need car friday.please

FP pressure test........
 

Vince,

Do you realize what you are talking about? Have you ever pressure tested a CIS FP? This is a technical forum and such advise means you know it as a fact!!!!! Demonstrate that a good working FP delivers only 2 lbs. pressure and I'll buy you dinner for two!!!!! I spent a lot of time testing and checking CIS components including fuel pumps and I would say you are providing wrong information to the forum. Prove me wrong and I'll be more than happy to give you a free dinner and a public apology.

Tony

The pressure on the system is coming from the restriction in the iron fuel head.
You will indeed get an indicated 90lbs or so from the pump but only if you deadhead it.
If you loop the system like with carbs there will be no pressure like that because of little restrictions.
That little soda can sized fuel pump isn't going to make any kind of pressure unless you restrict the flow somehow like with the CIS parts, or deadhead it to a fuel pressure guage.
I think it's wonderful that you are testing these parts.

Thought I would add to this. Maybe I don't explain things well but I will do my best.

I did a search this morning on this subject and see that there is different thoughts on how the PMO regulator works.

Some people seem to think that the CIS pump will somehow push high pressure to the PMO regulator without any of the CIS system's restrictions, while somehow(?) the PMO regulator brings down the pressure to 3-4 lbs to run the carbs. That would be quite a feat for that little box.
Tony, you mentioned this in this very thread.

This is not how it works.

Like I've said, when you recirculate the fuel with the PMO regulator it's just looping back to the fuel tank.
And yes it will be around 2lbs.
The PMO regulator is pretty simple. It just connects the feed and return lines. At the return back to the tank there is the adjustment screw that increases fuel pressure. Tighten the screw down and pressure goes up.
Loosen the screw out all the way and the regulator does nothing. Doing this will show on the pressure guage ......yes about 2lbs...and yes with the CIS pump.

Im sure with all your experience testing you can understand why there is little pressure when the pump is not restricted with the CIS system in place. It's pretty grade-school logic actually. I'm sure your a smart guy that maybe put more effort into acting like a dick on the internet than thinking about what people are trying to tell you.

Here's a couple of threads I found for you.

Post #11
http://forums.pelicanparts.com/porsche-911-technical-forum/594417-adjusting-pmo-fuel-regulator.html

Post #19, 22, 27
http://forums.pelicanparts.com/porsche-911-technical-forum/575055-pmo-fuel-regulator.html


http://forums.pelicanparts.com/uploa...1352989952.jpg

Sorry buddy, you owe him dinner and a public apology.
I recently installed webers on a 3.0 using the existing cis fuel pump.
With the PMO regulator wide open, the pressure at the regulator was ~2 psi.
I cranked down on the regulator restricting the fuel flow until the pressure increased to 4.5 psi.

Pressure gets created by restrictions.
How could a CIS fuel pump deliver 90 psi without any restrictions?

it seems my thread became battle field...ok...i dont mind, only in discussion you gonna get some results...
but could someone fight about the wiring please... :)

You guys are correct!!!!!
 

Vince,

After further review and reading about the PMO regulator's function you are indeed correct and I was mistaken (wrong). Please accept my apology for contradicting your statement. I will PM for your address. I like people who could educate me. Thanks.

Tony