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#1
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Hot start issue m62tub44
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#2
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Mine does that sometimes. It’s very intermittent. I put a new filter on which made no difference and I did buy a fuel pressure tester to see if the fuel supply is the issue ie non return valve but still haven’t got round to checking it. I’m also going to remove the crank sensor and give it a clean to see if that helps.
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#3
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Quote:
So I’ve just gotten in the habit of getting in the car and immediately turning the ignition to run, then buckling up and then cranking the X. Has never happened when I follow this routine. I have been chasing a very occasional fuel vent system code and wonder if fuel pressure could leak down through that system.
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Current Original owner 2002 E53 X5 4.4i to 4.6i swap 2025 G06 X5 50e Former 1972 Audi Fox 1986 Saab 900S 1996 BMW Z3 1998 BMW E36 M3 Sedan 2004 BMW E46 M3 2006 Audi A3 Quatro 1993 Mopar 318 Jeep Grand Cherokee 2015 V6 Jeep Grand Cherokee |
#4
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Wife's would do this when the FPR failed. Technically just an o-ring. Test the gas pressure at the rail and let it sit overnight. If you don't have 10-20 psi these FPR is leaking back to the tank.
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2011 E70 • N55 (me) 2012 E70 • N63 (wife) |
#5
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Quote:
I asked my wife last night if she recalls it being hard to start when she drove the car daily (bought it new for her in 2002) and she said it’s been doing it occasionally for as long as she could remember.
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Current Original owner 2002 E53 X5 4.4i to 4.6i swap 2025 G06 X5 50e Former 1972 Audi Fox 1986 Saab 900S 1996 BMW Z3 1998 BMW E36 M3 Sedan 2004 BMW E46 M3 2006 Audi A3 Quatro 1993 Mopar 318 Jeep Grand Cherokee 2015 V6 Jeep Grand Cherokee |
#6
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Hot start issue m62tub44
I had 01 with the large filter and FPR built in.
On realoem what does it show for FPR/filter? Yes got to have an FPR or it's not going to have the return line that feeds the siphon jet. Follow the return line to the left tank and see where it goes maybe the FPR is a separate unit on your car.
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2011 E70 • N55 (me) 2012 E70 • N63 (wife) Last edited by andrewwynn; 09-08-2023 at 01:15 PM. |
#7
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I thought the difference was weather or not the regulator was removable from the filter not that the regulator was at another location. Anyway, regulator is the least likely cause of fuel leak down.
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1988 325is (purchased new) sold 2004 X5 3.0 2005 X3 2.5 2008 X5 3.0 (new to me) |
#8
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Thanks Gents. 6/2002 4.4i build car with fuel filter 16126754016. ( https://www.realoem.com/bmw/enUS/par...&q=16126754016 )
I've looked through RealOEM and the car, and can't find a stand alone FPR. Maybe it is built into the smaller filter. If so, then it definitely isn't the FPR that is causing my occasional hard start since the OE filter I put in last year has maybe 10k on it.
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Current Original owner 2002 E53 X5 4.4i to 4.6i swap 2025 G06 X5 50e Former 1972 Audi Fox 1986 Saab 900S 1996 BMW Z3 1998 BMW E36 M3 Sedan 2004 BMW E46 M3 2006 Audi A3 Quatro 1993 Mopar 318 Jeep Grand Cherokee 2015 V6 Jeep Grand Cherokee |
#9
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Just changed fuel filter with the built in fpr after having a complete no fire incident earlier, too much cranking killed battery so had to be jumped. When I removed old filter it was hot at least 45°c! Will see if that makes a difference before changing pump. Will keep you posted since battery is on charge now. Why did BMW put the fpr on the filter? Why not on the fuel rail like they used to? Means fuel filters are 5x the price than they need to be. Wtf bmw
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#10
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The filter and FPR can be replaced separately also the filter is good for half a million miles so they consider it "lifetime".
The o-ring on the FPR, however good for maybe 160-250,000.
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2011 E70 • N55 (me) 2012 E70 • N63 (wife) |
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