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#21
Yesterday, 05:50 PM
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I clamped off the fuel return line to the sending unit and the pressure spiked to well over 110. I turned the car off right away. As per Google, it's saying it my sending unit. I never have any issue running the tank down to almost empty. I tested this awhile ago, but who know. Maybe the nozzle is clogged but not fully blocked bc then pressures would be much higher I'm sorry my dumb ass didn't have a fuel pressure gauge in my arsenal. I've got compression tester that I've never used and God know how many other tools. Oh well.
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--------------------------------------------- 2003 X5 3.0i Silver (build 07/03) 2006 X5 3.0i Blue 1977 Ferrari 308 GTB 1994 Ferrari 348TS Speciale #14/15 1989 Ferrari Testarossa 
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#22
Yesterday, 06:28 PM
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Also as per Google,.now it's saying it's my fuel pressure regulator (fuel filter).
Mine sending unit is original. So maybe time to change it anyway.
__________________
--------------------------------------------- 2003 X5 3.0i Silver (build 07/03) 2006 X5 3.0i Blue 1977 Ferrari 308 GTB 1994 Ferrari 348TS Speciale #14/15 1989 Ferrari Testarossa
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#23
Yesterday, 06:43 PM
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Quote:
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#24
Yesterday, 09:15 PM
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The regulated pressure is what it's at when the pump stops. I can almost guarantee the problem is not with the filter/regulator unless maybe it's not the right one or plumbed in wrong. I find the 80 PSI (at the rail right?) really hard to believe especially without setting a code. We had someone saying a while back they had 80 PSI but turned out to be a mistake, otherwise I think unheard of.
Fuel pressure plumbed back to the vacuum/vent fitting at the regulator might create that scenario but someone would have to really go out of their way to make that happen. Someone installing the rollover valve (jet pump side) incorrectly or something messed up with the relief valve (on end of third hose going into the pump well) or line going to it, might cause that problem and also still let the jet pump operate. Again assuming that the engine running pressure really is 80 PSI with out setting a code or even showing up big time on your fuel trims. You never answered if you are using a BMW specific diagnostic platform that can get all the codes.
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1988 325is (purchased new) sold 2004 X5 3.0 2005 X3 2.5 2008 X5 3.0 (new to me) Last edited by 80stech; Yesterday at 09:43 PM.
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#25
Today, 12:11 PM
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Old fuel filter is out. It was a Hengst. This was out in by the mechanic.
I want to confirm the hose hookups before I install new. Black vac line easy. Ok. On same side there is an out that had a blue line connected. Also, easy, nothing to mistaken. On other side there is the in and the return. The in had the black hose and the return had the other blue hose. Can you all confirm this is correct. So in a nutshell, main feed is black, blue hoses are the outs.
__________________
--------------------------------------------- 2003 X5 3.0i Silver (build 07/03) 2006 X5 3.0i Blue 1977 Ferrari 308 GTB 1994 Ferrari 348TS Speciale #14/15 1989 Ferrari Testarossa
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#26
Today, 01:50 PM
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Seems like the hard line going to the rubber piece to the sending unit is blue, so I think the return is blue and the feed in must be black. That is how my fuel filter was hooked up, when I removed it. The brand was Hengst. I'm now feeling like it's maybe the sending unit with a restriction vs the pressure regulator just being off at 80psi. This fuel filter was new from the mechani
__________________
--------------------------------------------- 2003 X5 3.0i Silver (build 07/03) 2006 X5 3.0i Blue 1977 Ferrari 308 GTB 1994 Ferrari 348TS Speciale #14/15 1989 Ferrari Testarossa
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