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Discussion Starter · #1 ·
Hi everyone, my 2000 BMW E46 320CI has thrown a P1250 PRC Solenoid Malfunction Code. The car hesitates to accelerate sometime under load and going above the slope on the motorway. Also difficult cold startup and sometime stuttering. It seems like i have a fuel pressure problem. sometimes the car work really fne with no power loss issues and sometimes it is showing these issues. I would like to ask where can i start from. I can check fuel pump, fuel filter or directional control valve?

for the DCV in m52TUB20, does anyone knows where is it located and how can i replace it? if there are any photos it will be really helpful. the part number is


Thankyou
 

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E30M3 Race F10 535 R1150Rt M Coupe
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Fuel pressure regulator is on the filter. The running losses (3/2) valve I will have to look up the shop on Monday for your 320.
 

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the people’s mod
2004 330Ci 115k miles
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Discussion Starter · #6 ·
thankyou so much everyone, i would like to ask, can i check the condition of the fuel pressure regulator, if it is good or not?
 

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Discussion Starter · #7 ·
On your M52TUB the FPR is on the fuel rail, part #7 here.

Contrary to what is stated above your fuel filter has no FPR, part #1 here.

I don’t see the 3/2 directional valve on your 320Ci.


you are right, i thought all M52TUB had a DCV and FPR under the car. Thanks
 

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Generic good advise:

If you suspect anything in the fuel delivery system, put a pressure gauge on
the fuel rail and check pressure. Ideally, check pressure idling, driving, and
climbing a steep hill under heavy load.

That divides the 'fault line' between supply (crap in the tank, pump, regulator, lines)
and delivery (injectors and DME).

The technology is inexpensive to make an electronic (i.e.safe) way to do this,
but I have yet to see a fuel pressure test kit that uses an electronic sensor.
They all seem to be mechanical. You can buy a gauge with an electric
(not electronic) sender and do it, but then you're stuck trying to find an
easy way to attach safely to the Schraeder valve on the rail.

I just zip- tie the test gauge to the outside of the hood, and check it that way.
Goofy and clumsy, but it works.

t
ought to be ebaying electronic gauge kits, huh?
 
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E30M3 Race F10 535 R1150Rt M Coupe
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Given your car is different than the USA (N America) spec cars is why I stated that I needed to get to the shop to check.
Yes the FPR is on the fuel rail. #7


To check fuel pressure, the easiest way would be to use a gauge with a "T" on the front of the fuel filter.

Insofar as the (Running losses) 3/2 way valve, your car does not have one.
Your fuel delivery is older style with feed and return lines on the fuel rail.
The N. America cars only have a feed hose on the rail.
The return (3/2) is under the car.
 

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Discussion Starter · #10 ·
Generic good advise:

If you suspect anything in the fuel delivery system, put a pressure gauge on
the fuel rail and check pressure. Ideally, check pressure idling, driving, and
climbing a steep hill under heavy load.

That divides the 'fault line' between supply (crap in the tank, pump, regulator, lines)
and delivery (injectors and DME).

The technology is inexpensive to make an electronic (i.e.safe) way to do this,
but I have yet to see a fuel pressure test kit that uses an electronic sensor.
They all seem to be mechanical. You can buy a gauge with an electric
(not electronic) sender and do it, but then you're stuck trying to find an
easy way to attach safely to the Schraeder valve on the rail.

I just zip- tie the test gauge to the outside of the hood, and check it that way.
Goofy and clumsy, but it works.

t
ought to be ebaying electronic gauge kits, huh?

Thankyou for your suggestion. i am planning to buy the fuel pressure gauge but i think it is difficulty to find one that can fit on the Schrader valve on the fuel rail. Do you know which type of fitting or converter i need for it to fit on the schrader valve? for me its better i order from Amazon de but i dont know which one can fit on my schrader valve.
 

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Discussion Starter · #11 ·
Given your car is different than the USA (N America) spec cars is why I stated that I needed to get to the shop to check.
Yes the FPR is on the fuel rail. #7


To check fuel pressure, the easiest way would be to use a gauge with a "T" on the front of the fuel filter.

Insofar as the (Running losses) 3/2 way valve, your car does not have one.
Your fuel delivery is older style with feed and return lines on the fuel rail.
The N. America cars only have a feed hose on the rail.
The return (3/2) is under the car.
Its a good idea also, i will try it too, thanks
 

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OEM ///PLUS
2003 M3 6MT Slicktop
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you are right, i thought all M52TUB had a DCV and FPR under the car. Thanks
yeah my USA 2000 323Ci (M52TU) did not have FPR attached to my fuel filter like M54s. it had it separate along with the 3/2 valve by the filter. but your FPR is up in the rail, interesting.
 
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