FIXED: Return of the P0171 and P0174

[diddy0071]

Originally Posted by TerminatorX5

the 110 - is listed as pressure regualtor, while the 535 is listed as filter WITH the regualator built-in...

I purchased a Mann fuel filter with pressure regulator built in on Amazon for $50 bucks. UPC 4011558937003

Could it be faulty or wrong pressure regulator?

[diddy0071]

Maybe I should get a Beck Arnley UPC 049797994932

[TerminatorX5]

Amazon.com: Mann-Filter WK 532 Fuel Filter: Automotive

[diddy0071]

Originally Posted by TerminatorX5

Amazon.com: Mann-Filter WK 532 Fuel Filter: Automotive

That's what I ordered last time.

[TerminatorX5]

it should be correct filter... OEM, not OE but still, correct...

[diddy0071]

Originally Posted by TerminatorX5

it should be correct filter... OEM, not OE but still, correct...

I was Reviewing the fuel lines coming into the fuel filters, one is a return line to the driver side of the tank, and the other is the line coming from the fuel pump. There were no instructions on the fuel filter itself indication which of the two ports was to which.

I'm just double guessing my work now and maybe the fuel filter installation was incorrect. When I removed the old filter, I did it line by line. In fact, I made sure that I connected the pressure regulator first, and then I installed the fuel line (left to left, right to right) as it looked like from the old filter.

[bcredliner]

I check the application chart from your link, it checks and according to realoem there was only one filter offered that year. I checked bavarian autosports site. The list only one filter and it is the correct BMW part number, however, it is $64.

Is your X worse, different or the same than before you changed the filter?

[diddy0071]

Originally Posted by bcredliner

I check the application chart from your link, it checks and according to realoem there was only one filter offered that year. I checked bavarian autosports site. The list only one filter and it is the correct BMW part number, however, it is $64.

Is your X worse, different or the same than before you changed the filter?

The problem is I had the original issue, then I replaced the fuel pump and issue was gone. I then replaced the fuel filter (about a week/2 weeks later) with the fuel rail (I broke the schraeder valve on the old one) and then about 800 miles later I started getting the no power symptoms again.

[bcredliner]

If the symptoms were the same before the first fuel pump replace as when they returned and one of the fuel pumps fixed the problem for 800 miles. the logical conclusion is that the fuel pump is bad again. That is strange but not the strangest thing that has ever happened.

The line were were discussing is a vacuum line for vapor that connects to the smaller tube that exits 90 degrees out the side of the regulator portion. The line to the engine exits straight out from the fuel filter portion.

The two tubes exiting from the bottom are fuel lines. The lines are not identified as from tank or return line, just fuel lines.

This is per the Bentley manual.

[diddy0071]

Originally Posted by bcredliner

If the symptoms were the same before the first fuel pump replace as when they returned and one of the fuel pumps fixed the problem for 800 miles. the logical conclusion is that the fuel pump is bad again. That is strange but not the strangest thing that has ever happened.

The line were were discussing is a vacuum line for vapor that connects to the smaller tube that exits 90 degrees out the side of the regulator portion. The return to the tank line connects from the top of the regulator portion. the line to the engine exits straight out from the fuel filter portion.

I already replaced the fuel pump, albeit with another used pump. As soon as I put the 2nd replacement pump I drove the vehicle and that didn't fix it. Unless they sold me a 2nd defective unit, I don't think this is the problem. I did order new relays (6 bucks on amazon) so I'm replacing those.

As for the fuel filter, there is only 1 exit from the fuel filter that goes to the engine, and that is where the regulator is attached directly to the fuel filter. That goes straight to the engine. On the other end, there were 2 ports that enter into the fuel filter.