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**John L. Harrell** · 09-01-2007, 04:07 PM

BTW

I have to say that I have never seen a fuel sending unit in the E30 go bad. Lift pumps yes.
The sending unit is a simple and reliable design. A float moves a wiper on a potentiometer which translates to the needle swing on the guage. At approx 1.5 gal US a switch closes and illuminates the low warning light.
The OBC is pretty accurate if it is getting reliable inputs. It does not guess.

09-01-2007, 04:07 PM	#9
John L. Harrell Name: John L. Harrell Title: United Newb Status: Offline Join Date: Aug 2007 User not setup in Rate My Car. Click here to set it up. Your Ride: 87 325i	BTW I have to say that I have never seen a fuel sending unit in the E30 go bad. Lift pumps yes. The sending unit is a simple and reliable design. A float moves a wiper on a potentiometer which translates to the needle swing on the guage. At approx 1.5 gal US a switch closes and illuminates the low warning light. The OBC is pretty accurate if it is getting reliable inputs. It does not guess.