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#11
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The previous loss of power sounds more like low fuel pressure or bad can position sensor. (Very often no codes) You need to test actual fuel pressure. Also; I recently fixed a car that crank no start because the fuel filter was installed with the output/return lines crossed sending no fuel to the engine (that error will show up as no pressure: I think you checked at the rail just not sure if you checked after swapping filter). It's typical for the fuel pump to side fail. The symptom feels like a problem with the FPR. One more thing; if fuel is near 1/4 tank is very likely that your siphon jet is leaking and you aren't getting fuel. If close to 1/3-1/4 tank add some gas just to eliminate that possibility.
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2011 E70 • N55 (me) 2012 E70 • N63 (wife) |
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#12
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Thanks for the suggestions. I couldn't get to this yesterday because of work. Today I pulled the forward most spark plug out, no sign of oil or fuel on it (put it back and cranked and pulled it out again and still no sign).
I checked for fuel at the rail after I put the new filter in (didn't think to check before). It's there, but i don't know if it's enough. I can borrow a fuel pressure gauge at O'Reilly's, guess I need some way to jump the pump relay to use it because I don't have a helper. Also a problem for testing spark, maybe this weekend. FWIW the fuel tank is currently 3/4 full so i don't think it could be a siphon issue. I could pull the pump out and check for a crack in the tube that goes to the top of the tank, but it really seems to gush out when I crank with a hose stuck in a bottle. I guess I could throw a new fuel pump relay in if you think that might be the problem? But like I say, when I crank it gushes so I think the problem must be downstream from there. But maybe that's wrong.
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2001 X5 3.0i Old Gold -built and bought 08/2000, now at 220K miles 2005 X5 3.0i Silver Bullet -built 05/2005, bought 03/2021 at 95K miles |
#13
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You need to use a fuel pressure gauge. 50.0 psi not "gushing out". It needs to be stable.
My wife's previous car had very similar symptoms and the fuel pressure was 49-50 but would jump around so fast the needle looked translucent. New FPR fixed hers.
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2011 E70 • N55 (me) 2012 E70 • N63 (wife) |
#14
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Thanks. I will try to get the pressure gauge and a system for jumping the relay tomorrow. Bentleys says the jumper must be 14 gauge and have a 15 amp fuse. Is that correct (a wire would be a lot easier, but I will be going to O'Reilly's)?
I still think it's more likely the fuel system than the ignition, but I have been known to be wrong (ask my ex). Seems like I should check the actual pressure at the fuel rail and report back.
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2001 X5 3.0i Old Gold -built and bought 08/2000, now at 220K miles 2005 X5 3.0i Silver Bullet -built 05/2005, bought 03/2021 at 95K miles |
#15
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You def.need to meausure actual fuel pressure.tge crazy thing is wife's car sounded like no spark when yr he problem was weird fuel.
Static pressure was 50 but once I eventually did get it started it would jump from 48-50 or something like that. Was suggesting FPR problem and when I did post mortem on the FPR found the 8mm o-ring that was leaking and the actual problem. Could have just changed 40¢ o-ring vs $65 fuel filter. Live and learn.
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2011 E70 • N55 (me) 2012 E70 • N63 (wife) |
#16
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Trying to test the fuel pressure but I'm not sure I'm doing it right. I have jumped the relay and can hear the pump running (although it sounds a bit inconsistent). There is definitely fuel at the Schrader valve, if I press it with a small screwdriver it comes out, but the pressure gauge I borrowed from O'Reilly's is not showing anything, ie the needle doesn't budge. I am using the "Ford Schrader Adapter" from the kit (the only thing that comes close to fitting), it threads on fine and I can press it in at the top and get fuel, but I am wondering if it is not seated all the way and maybe I need a different adapter? Is there any secret to this?
I did put new spark plugs in, because I had them. I have not tested for spark because I have not had anyone to crank for me. Is there any way around that?
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2001 X5 3.0i Old Gold -built and bought 08/2000, now at 220K miles 2005 X5 3.0i Silver Bullet -built 05/2005, bought 03/2021 at 95K miles |
#17
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If you get fuel flowing when you press the release valve then the gauge is probably hooked up ok.
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1988 325is (purchased new) sold 2004 X5 3.0 2005 X3 2.5 2008 X5 3.0 (new to me) |
#18
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Good point. I tried the release valve and got nothing, but I'm not sure I had the relay jumped when I did it and I'm not sure how much residual pressure there is. I will confirm in the morning.
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2001 X5 3.0i Old Gold -built and bought 08/2000, now at 220K miles 2005 X5 3.0i Silver Bullet -built 05/2005, bought 03/2021 at 95K miles |
#19
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The gauge adapter has to press the shrader valve button to register pressure.
If you hear the fuel pump and get a "splurt" of fuel at the rail you have the parts you need to test just need to get the gauge connected. Sent from my iPhone using Tapatalk Pro
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2011 E70 • N55 (me) 2012 E70 • N63 (wife) |
#20
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With the pump running I get an occasional drip of fuel out of the relief valve on the pressure gauge, but it still doesn't register anything. I am wondering if the schrader adapter is fully engaging. I do get a splurt of fuel if I take the gauge off and press in the adapter top with a screwdriver.
The pump sounds a bit rough to me, but I do hear it constantly running. I asked O'Reilly about a different adapter and all they could say was that kit "works on all vehicles".
__________________
2001 X5 3.0i Old Gold -built and bought 08/2000, now at 220K miles 2005 X5 3.0i Silver Bullet -built 05/2005, bought 03/2021 at 95K miles |
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filter, fuel, ignition, pump |
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