Fuel Pressure Regulator

My fuel pressure regulator is internally leaking. I have found this company skandix.de which is selling reproduction parts of d jetronic fuel pressure regulators and I was wondering if this has been used by any others and to what effect?  www.skandix.de/en/spare-parts/engine/fue...e-regulator/1018592/

I have a 1973 Mercedes Benz 450 SEL US model. 

Thanks,
John
 

Hi John,

that seems to be a new product since end of last year. I see that for the first time.

New to me, too...
There are alternatives that are less expensive.
But this seems to be a perfect fit.

Did you read the description and what they say here: www.skandix.de/en/news/new-djetronic-fue...sure-regulator/2902/ : "The fuel pressure regulators are now available in our shop under the numbers 1071886 and 1061995 . As already mentioned, they can also be used in BMW, Mercedes, Opel and other vehicles with D-Jetronic."

I would trust the product... there is a warranty of 2 years in Germany.
But I have the advantage the company is less than 50km away from my home...
I don't know the conditions if the item is shipped to your country.

Regards
Norbert


 

Seems like a trustworthy product. I think I will buy one

Hi John,

please report how that product works.

I will. Dr-Djet thanks for the quick reply. Further question: I want to install an inline fuel pressure gauge and I was wondering if you had any recommendations as to where/which gauge I should buy and place in the system.

Thanks,
John

Hi John,

I do not recommend to do so. I once tried and had steam bubbles collecting in front of gauge. To avoid that you should mount gauge lower than fuel lines and then you cannot read.

An update to this post. I ordered the SKANDIX 1018592 fuel pressure regulator and it seems to be a 1 to 1 fit for the old fuel pressure regulator. I've attached a few photos of the packaging and the fuel pressure regulator itself in comparison to the original. Are there any best tips or practices that can help with installing a new FPR?

Thanks,
John

Thank you, John, for information and the photos.

Yes, there are things you have to take care about.

At first, don't load the fuel-pressure by switching ignition on before removing the old regulator. Best is, the engine has been standing for at least some hours. Otherwise, you will be surprised about the amount of fuel...
And then - the short hose between FPR and the pressure damper tends to clogg, because this hose is not bent from the factory and gets a crincle. Use a bent hose. They are temporarily unavailable from DB, but you could use a GATES MFL1108 and cut out what you need.

You have to adjust the fuel pressure,use a calibrated manometer.

Regards
Norbert




 

Do you have any recommendations for where to plug the pressure tester in? I am assuming the cold start injector, but I'm not sure which side. Also, is there a diagram for the direction of fuel flow I could reference?

Hi John,

remove cold start valve hose and install pressure gauge there.

Hello John,
The fuel line is a ring line.
The outlet of the FPR is opposite the adjustment screw.
The other two <opposite> connectors are connected to the same chamber.

Regards
Norbert

handbook.w116.org/Engine/107/M117_45/074-130.pdf

Following the instructions here

Hello everyone,

I just installed the SKANDIX 1018592 regulator on my 1972 R170 350SL US 4.5 to replace the original one, which was no longer holding pressure.
Well, it leaks even worse!
As soon as the engine is turned off, the pressure drops from 2 bar to 0.7 bar in two seconds and then stabilizes at 0.5 bar.
It’s the same story when turning on the ignition: the pump runs for two seconds, the pressure rises to 1.5 bar, and then drops instantly.
If I pinch the fuel return hose, the pressure doesn't drop at all.
While the engine is running, the pressure gauge needle (despite being glycerin-damped) vibrates much more than it does with the Bosch unit.
I’m disappointed, especially since this part costs €265. I’m going to send it back, hoping it’s just a defective unit.

Best regards,
Jean-Charles

Hi Jean-Charles,

Please have a look at this trouble shooting guide which was made for/by Mercedes-Benz USA.

Best, Peter

 

Hello Pcircle,

Thank you for this clear procedure.
I am exactly in the situation described as 'Pressure regulator leaks. Not critical, Fuel returns to fuel tank'.

Skandix replied to me today, and I'm not entirely convinced by their explanations.
To me, it is not normal for the pressure to drop by 1.3 bar in 2 seconds when the engine is shut off. The pressure should remain above 1.5 bar for at least 10 minutes.
Yet, according to them, a 1-bar fluctuation at idle wouldn't be an issue.
My tests show that the pressure loss is caused only by the regulator; there are no leaks elsewhere.

The pressure usually fluctuates quite significantly at idle due to the slow opening and closing of the pressure regulator.
We therefore recommend adjusting the pressure at an increased engine speed of 2000 rpm. The pressure gauge will then show the average value, which should be between 2.0 and 2.1 bar.
The pressure drop when switching off can vary considerably depending on the situation; 0.5 bar is not a cause for concern. This depends on how far the valve is open at the moment of switching off.
Over time, the regulators become sluggish and the pressure curve becomes more uniform; this is normal. That is why they should be readjusted from time to time.

If you set a new regulator to 2 bar at 2000 rpm, it will show fluctuations between 1.5 and 2.5 bar at idle, depending on how low the idle speed is. The lower the idle speed, the greater the range of fluctuation. This is normal.

Hi Peter, 

Many thanks for sharing.

Greetings Marc

Hi,

a n original pressure regulator does not let the pressure drop by 1 bar and does not need adjustment at 2000 rpm.

I am disappointed of this Scandix pressure regulator.

Hello,

I'm disappointed too—especially since, on top of wasting my time, they're even refusing to give me a refund!
€300 thrown out the window...

As the regulator is not defective a return after installation is not possible, I am sorry.
When properly adjusted according to the instructions you got in the last email the car will work fine, so I can not see a functional problem here.

Now I just need to find a Bosch unit in good condition.
It's just like with injectors: no reproduction matches the quality of the original Bosch ones.

Jean-Charles

Perhaps an inexpensive alternative : DELPHI FP10545 (price 55 € at Rockauto)
www.benzworld.org/posts/18793444/

Apparently, it meets specifications and holds pressure. The problem is that it has only one inlet. It is designed for 4-cylinder engines.
You could get around this using a T-fitting. I don't know if that affects the pressure; intuitively, I’d say no.