Carrera 3.2 fuel pressure regulator removal.........

[mghorayeb]

I have an ‘86 911 US Carrera.
Lately, it takes a few cranks to get started. It used to start first crank immediately.
Air filter is recent.
I don’t suspect fuel filter since once started, it runs perfectly.
I don’t suspect spark for same reason.
Top end was done 10K or so ago, & new engine bay fuel lines were installed then.
Today I swapped the DME relay and the problem remains.
Any ideas before I get into this fuel pressure regulator replacement?

[boyt911sc]

Install a pressure gauge at the test port located at the fuel rail near intake #1. I used my CIS gauge with the shut-off valve @ closed position. Then test run the FP by bridging fuses #16 & #17. The spec. 33~39 psi. (No Vac. applied or Engine off). If vacuum is applied either by a vac hand pump or a running motor, the spec. is 29 psi.

Switch off the FP and monitor the residual pressure for the next 15 mins. A good residual pressure should be about 14.5 psi./1 bar or more but not less.

Tony

[DemianM]

Tony,
If your current fpr fails, there is an option made by sleepers speed shop, they machine a billet base to use a smaller modern fpr (such as the one no 996-997s). They have one for 964s and where developing one for 3.2s.

Cheers

[mghorayeb]

Originally Posted by boyt911sc

Install a pressure gauge at the test port located at the fuel rail near intake #1. I used my CIS gauge with the shut-off valve @ closed position. Then test run the FP by bridging fuses #16 & #17. The spec. 33~39 psi. (No Vac. applied or Engine off). If vacuum is applied either by a vac hand pump or a running motor, the spec. is 29 psi.

Switch off the FP and monitor the residual pressure for the next 15 mins. A good residual pressure should be about 14.5 psi./1 bar or more but not less.

Tony

Tony,
Based on my initial findings, is the FPR a sensible direction to be looking?
How exactly does a 911 line this behave with a faulty FPR? Only problems on warm start? Or cold start too? I can’t detect a pattern with mine. Seems like the difficult starts happen arbitrarily. Wonder if my living in South Florida heat is making this an extra tricky diagnosis.
If I perform that pressure test, do I need to remove only the air intake (as if i’m changing the air filter) or more?
Finally, do you have a picture of that test port? Will a tire pressure gauge with flexible hose work with some type of adapter?

[mghorayeb]

Originally Posted by DemianM

Tony,
If your current fpr fails, there is an option made by sleepers speed shop, they machine a billet base to use a smaller modern fpr (such as the one no 996-997s). They have one for 964s and where developing one for 3.2s.

Cheers

I looked online and found the ridiculously priced Bosch for over $500. Apparently Volvo/Peugeot use the same one...for $100!

The Sleepers adapter might be interesting, but I’d like to keep things as close to original as possible.

[proporsche]

boy in Florida..be very careful to play with the fuel inside your engine bay..If you do not have the proper tools..i would suggest to go to Porsche mechanic to do this test,really..
Ivan

[mghorayeb]

Originally Posted by proporsche

boy in Florida..be very careful to play with the fuel inside your engine bay..If you do not have the proper tools..i would suggest to go to Porsche mechanic to do this test,really..
Ivan

Every mechanic I’ve dealt with has been a disappointment. I end up cleaning up their mistakes myself.

If anybody knows anyone in Naples area who is a serious mechanic, please recommend.

[proporsche]

I`m sure somebody will pitch in with the mechanic..i do understand it is hard to find one...
do some reading regarding your problem ..there is plenty of info here on search button...The fuel gauge you need is a tool which has to be made to be safe.Or maybe you can get it online.It will hook to your fuel rail end .. the fitting end on right on this pick..
https://lh3.googleusercontent.com/proxy/bK6Ame3XOlbtiA6g_jiQCZTo649DDDG4qBGY-GwZLvWfT1x0fy0XZoX-icPGyMWU6TNi79Kh59v3d5DsQafVfX2ARTVoUsnj1h08

[boyt911sc]

Originally Posted by mghorayeb

Tony,
Based on my initial findings, is the FPR a sensible direction to be looking?
How exactly does a 911 line this behave with a faulty FPR? Only problems on warm start? Or cold start too? I can’t detect a pattern with mine. Seems like the difficult starts happen arbitrarily. Wonder if my living in South Florida heat is making this an extra tricky diagnosis.
If I perform that pressure test, do I need to remove only the air intake (as if i’m changing the air filter) or more?
Finally, do you have a picture of that test port? Will a tire pressure gauge with flexible hose work with some type of adapter?

Mg,

I don’t have a picture of the fuel rail test port. It is located at the end of the fuel rail for cylinders #1-#2-#3. Actually it is located by cylinder #1 under the plastic heater blower tube/duct. I remove this heater duct for better access.

You will need a fuel pressure gauge that will fit to a 14-mm x 1.5 (female). A tire pressure gauge will not work. And if you are not experienced and uncomfortable working with volatile and flammable material like gasoline, let someone do it for you. The test is to confirm that the system and residual fuel pressures are within spec. If they are, the FPR is NOT the culprit for your problem. It is something else.

Tony

[BoxsterGT]

This might help....



I have the Fittings if needed.

Len.Cummimgs at verizon.net

[Lund]

Like this..

[7783911]

the small nut/allen that hold the bracket on..any one have a suggestion how to tighten since mine appears loose?

[boyt911sc]

Originally Posted by boyt911sc

I had so much practice removing and installing FPR’s using five (5) different fuel pressure regulators. As a matter of fact, I found a procedure to bench test a FPR that I could tell before installing whether it good or bad. To confirm the results of the bench tests, I ran all fuel pressure regulators in the car.

As expected, all four (4) fuel pressure regulators that failed the bench tests also failed using the motor. The only one that passed the bench test and trial run was the new FPR from NAPA (Made in Mexico). The big question is how long would this unit last compared to the Bosch (Made in Germany)? Paid $70 for the NAPA FPR compared to Bosch (Made in Germany) that costs more than $500+.

Right now, I am satisfied that the car is running and holding its residual pressure very well. Even after 60 mins., the residual fuel pressure at 20 psi.



A friend living in Europe is helping me find a Bosch FPR with no luck. Anyone buying a used Bosch fuel pressure regulator should request from the seller a guarantee that the unit is good and subject to return if defective. The spare units that were loaned to me were supposed to be good units.

Tony

It is exactly 6 years ago when I replaced the defective OEM Bosch fuel pressure regulator with a Napa brand (Made in Mexico) FPR at an amazing tag price of $70 in mid-October 2019. It seems that the FPR is holding pretty good and could last a few more years. I am keeping my fingers crossed.

Tony

[BoxsterGT]

In case anyone needs to check fuel pressures, we now have adapters made up and are offering these Pressure gauges for the 3.2 Fuel Rail Test Port.....





For info, please email me only. No PMs as my box is FULL.

len.cummings @ verizon.net but without the spaces.

[KNS]

Originally Posted by boyt911sc

It is exactly 6 years ago when I replaced the defective OEM Bosch fuel pressure regulator with a Napa brand (Made in Mexico) FPR at an amazing tag price of $70 in mid-October 2019. It seems that the FPR is holding pretty good and could last a few more years. I am keeping my fingers crossed.

Tony

That's good news and thanks for the follow up! I just checked NAPA's website and the part is still available but it's now $210.99. Still cheaper than the Porsche genuine part.

[BoxsterGT]

Anyone buy a 3.2 Fuel Dampener 930.110.602.30 recently?

Wondering what the Porsche cost is on this?

Here is our Modular replacement we are working on presently.....



Getting close to a complete package, just a few details left.

For info please email me.

len.cummings @ verizon.net, but without the spaces.