[Avenged328i]

Does anyone have any knowledge on a fuel pump (328)?

Reason I ask, and I know I will probably get flamed for this, but lately I have been running my car on low fuel.
About 20 mi or less - fill up - etc.
Recently I just got a check engine light.
I assume it has to do something with the fuel pump since I have been the car with low fuel and not topping it off when it reaches 1/4 tank (like I usually do).

Not sure how to word the question since I have zero knowledge of the mechanics of BMW fuel pump, but what is the material, location, etc.

Thanks.

[bahasad]

Originally Posted by Avenged328i

Does anyone have any knowledge on a fuel pump (328)?

Reason I ask, and I know I will probably get flamed for this, but lately I have been running my car on low fuel.
About 20 mi or less - fill up - etc.
Recently I just got a check engine light.
I assume it has to do something with the fuel pump since I have been the car with low fuel and not topping it off when it reaches 1/4 tank (like I usually do).

Not sure how to word the question since I have zero knowledge of the mechanics of BMW fuel pump, but what is the material, location, etc.

Thanks.

Get a scan of the car and see what codes pop up.

I remember one time I ran my old E36 out of gas. The fuel pump had consistent issues after that day.

But since there is still fuel in your car, it might be another code.

[CalCarNut]

If memory serves, fuel acts as the 'cooler' for the pump...they don't like to be uncovered, even for a short time if you're down to a gallon or so and uncover the pump on a curve, etc. Best practice with these things (and fuel pumps seem to be an Achilles heel w/ BMW) is to keep as close as possible to 1/4 tank in the car just for insurance.

[rolltidef32]

Originally Posted by SoCalDave

If memory serves, fuel acts as the 'cooler' for the pump...they don't like to be uncovered, even for a short time if you're down to a gallon or so and uncover the pump on a curve, etc. Best practice with these things (and fuel pumps seem to be an Achilles heel w/ BMW) is to keep as close as possible to 1/4 tank in the car just for insurance.

Other issue is a car with a turbo on low fuel causes issues as well.

The pump is somewhere in the tank somewhere up front right?

A 1/4 tank is a cautious level for sure, but the big thing is to not regularly go below 2 gallons or the 45 mile warning.

[drexplode]

Fuel pumps typically sit in a fuel pump module which most call a bucket / reservoir. Fuel Is drawn from the fuel tank, and sent forward towards the engine under pressure typically 3-6bar gauge; pressure varies to avoid vapor (liquid phase of a vapor curve). As fuel is drawn from the fuel tank, fuel is also drawn via an active fill feature for example a jet pump (venturi effect) which ensures the bucket / reservoir remains full at all times especially during low fuel handling maneuvers. Also, by-pass fuel from pressure regulator / pressure relief valve is returned to the bucket / reservoir. If you operate your vehicle with low fuel (E / low fuel warning on) then you run the risk of emptying the bucket / reservoir and losing supply pressure due to lack of fuel at base of bucket / reservoir. Risks = vapor, and operating fuel pump dry.

Long story short
-try to refill before E

http://www.ecstuning.com/BMW-F30-335...uel/ES2817620/

[Avenged328i]

Originally Posted by drexplode

Fuel pumps typically sit in a fuel pump module which most call a bucket / reservoir. Fuel Is drawn from the fuel tank, and sent forward towards the engine under pressure typically 3-6bar gauge; pressure varies to avoid vapor (liquid phase of a vapor curve). As fuel is drawn from the fuel tank, fuel is also drawn via an active fill feature for example a jet pump (venturi effect) which ensures the bucket / reservoir remains full at all times especially during low fuel handling maneuvers. Also, by-pass fuel from pressure regulator / pressure relief valve is returned to the bucket / reservoir. If you operate your vehicle with low fuel (E / low fuel warning on) then you run the risk of emptying the bucket / reservoir and losing supply pressure due to lack of fuel at base of bucket / reservoir. Risks = vapor, and operating fuel pump dry.

Long story short
-try to refill before E

http://www.ecstuning.com/BMW-F30-335...uel/ES2817620/

Nice. Thanks!