Quarter gas in tank causing misfire???

[jet_dogg]

It could be the sucking jet pump.

[michaeljchn]

After sitting on it some more...i think ill just start with the most obvious culprit the Sending unit

[michaeljchn]

clogged at 1/4 then clear up after full tank? It makes no sense.

Use hidden dash display to show fuel volume in left and right tanks when it got down to 1/4 on the gauge. If the left has more than the right tank then it is not good.

Yeah when you put it that way, my guess seems wrong lololol
but when i fill up during this whole debacle, i get 13.9 gallons. Wouldnt that indicate my sending unit is reading correctly? If the fuel tank is 16 gallons its sending the right signal to the gauge?

[Casa de Mesa]

Bad sending unit is what I'm thinking. Have a friend who had his sending unit fail and it was showing 1/4 tank of fuel but was actually empty.

Mayan-Viking

[sapote]

Im thinking clogged injectors?

clogged at 1/4 then clear up after full tank? It makes no sense.

Use hidden dash display to show fuel volume in left and right tanks when it got down to 1/4 on the gauge. If the left has more than the right tank then it is not good.

[michaeljchn]

Hey guys i have a weird issue with my fuel system. When i hit a quarter tank, my engine stalls out. I can restart the car and limp over to a gas station but the entire way - the car would run horribly. Misfires and stumbling.

However, once fully gassed up - the car runs beautifully.

Whats strange is that i have a brand new fuel pump that i thought would fix the issue...its OEM BMW too. My fuel filter is also brand new. And i dont suspect the sender unit because my fuel gauge does read accurately...

Im thinking clogged injectors?