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bmw n54 low pressure fuel pump symptoms?
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Kish
I just checked now and battery voltage is at 12.99 volts . Car was parked now for 6 hours not driven nor started . So i do not think it is battery
agree ?
It takes long to start . I would say about 5 seconds or more . during this time its cranking and the needles starts bouncing at 0 trying to come up . say after 5 -8 seconds it eventually starts .
idles seems fine .
power seems fine
no engine lights .
These cars need the Low pump to start ? correct. thats what primes the car and puts fuel to the front . Could it be its losing pressure over time parked ? hence fuel pressure regulator .
is there anyone that had this type of issue before .
a few websites says - fuel pressure sensor . some say fuel pressure regulator/filter kit . some say lpfp .
I just checked now and battery voltage is at 12.99 volts . Car was parked now for 6 hours not driven nor started . So i do not think it is battery
agree ?
It takes long to start . I would say about 5 seconds or more . during this time its cranking and the needles starts bouncing at 0 trying to come up . say after 5 -8 seconds it eventually starts .
idles seems fine .
power seems fine
no engine lights .
These cars need the Low pump to start ? correct. thats what primes the car and puts fuel to the front . Could it be its losing pressure over time parked ? hence fuel pressure regulator .
is there anyone that had this type of issue before .
a few websites says - fuel pressure sensor . some say fuel pressure regulator/filter kit . some say lpfp .
Iceman12596
///Member
Bud at that voltage its pretty clear the battery is healthy.
I had exactly this issue when i had my 335i turned out to be HPFP.
The story of LPFP running at low RPM when starting is BS, they both work together, although the lpfp is pumping, the HPFP is the one that does majority of the work, including cold starts, this does not mean to say your issue is the same could be LPFP, my advice, get your self some wynns fuel system cleaner and run that with a tank before throwing money at the car, extremely rare the regulator goes, good luck bud.
I had exactly this issue when i had my 335i turned out to be HPFP.
The story of LPFP running at low RPM when starting is BS, they both work together, although the lpfp is pumping, the HPFP is the one that does majority of the work, including cold starts, this does not mean to say your issue is the same could be LPFP, my advice, get your self some wynns fuel system cleaner and run that with a tank before throwing money at the car, extremely rare the regulator goes, good luck bud.
Little Goliath (Daniel)
///Member
have you checked codes? do you have any type of monitoring software? at idle LPFP should be around 70-80 and HPFP 700psi at idle and that goes up to 3000 at WOT
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