HELP! Stumbled Died, Now it Won't Restart..

[upallnight]

Originally Posted by Best4x4xFAR

Tried it again. sounded almost like a faint thumping noise from the backseat, but it started, and idled. Started counting, got to 18 and put it in reverse and backed it into my driveway, and stopped. Seem to idle normally for another 30 seconds or a minute. Just as I moved it from Reverse to Park, it died. Won't restart. Could it be something related to the gear selector? Never heard of that, but I'm grabbing at straws now. At least it is off the street..

Do you still hear that thumping noise? Most likely you have a dead fuel pump. Gasoline in the fuel tank is used to cool the pump. By running it down to almost nothing you are actually causing more wear and tear on the pump. Put a new fuel pump in and add another 5 gallons of gas. Sorry I don't know how many liter that will be but I never learn the Metric system and I'm too old to start right now.

[andrewwynn]

Originally Posted by upallnight

Do you still hear that thumping noise? Most likely you have a dead fuel pump. Gasoline in the fuel tank is used to cool the pump. By running it down to almost nothing you are actually causing more wear and tear on the pump. Put a new fuel pump in and add another 5 gallons of gas. Sorry I don't know how many liter that will be but I never learn the Metric system and I'm too old to start right now.

This is a myth. Especially with the x5. The fuel pump will be submerged completely down to about 2L (1/2 gallon of gas).

The x5 fuel tank when operating properly ONLY EVER has 8L or 10L (6 v 8 cylinder) gas on the right side of the tank once you have less than about 2/3 tank of gas. (E.g. there is no difference from the fuel pumps perspective from 2L and 98L of gas in the tank)

That said, the system that pulls the fuel from the left side of the tank and keeps the reserve tank (8L and only 8L) full has a few failure points.

➀ fuel pump weak doesn't supply enough pressure to filter/regulator (45% chance)
➁ jet siphon pump defective (45% chance)
➂ fuel filter/regulator problem (5% chance)
➃ some other extremely rare situation

Put in some gas at least 4-5gallon (15-20L) and enable test mode 6 on the dash. You should see over 1L when driving level. If the jet pump isn't working full power it needs some depth of fuel on the left side to help and your won't get full range: in my example i would run out of gas with 70miles to empty.

I replaced the fuel pump first and got little improvement in the reserve tank quantity.

I took out the jet pump and found an misplaced o-ring :





I replaced the o-ring and it helped a little but the second joint in pump was leaking like a sieve. There was no o-ring : I added an oring and and it solved the problem

[Clockwork]

Originally Posted by upallnight

Put a new fuel pump in and add another 5 gallons of gas. Sorry I don't know how many liter that will be but I never learn the Metric system and I'm too old to start right now.

i gallon = approx 4L
therefore 20L of fuel you recommend