Save yourself up to $200 and some headaches - Electric Fuel Pump PM

Originally Posted by trippinbimmer

ms45?

ms-13!

Originally Posted by Stinger9

ms-13!

Lol

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MS S54 of the 3.2L M3 engine 5.0 Bar or 72.5 PSI +/- 2.9 PSI

Originally Posted by jfoj

75 PSI +/- 2.9 PSI

You're a pretty high pressure guy!

The M cars are far higher fuel pressure than the non M cars. I had a small typo which I just corrected for the M car pressures.

I also just updated the first part of the thread with fuel pressure and volume testing.

The MS reference was taken directly from the Bentley manual. It is a reference to the engine management from what I recall.

In short all engines except the M3 S54 run at 50 PSI fuel pressure.

I think the value you found was the residual or static fuel pressure after the engine has been shut down for 20 minutes?

I just bought my m3 fuel pump for my non-m

Gonna take off like a rocket sled.

Not sure a M pump in a non M car is a wise idea?

At least on the E39 M5 the fuel pump is PWM controlled. I have not studied up on the M3, but many of the systems on the M3 and M5 are very similiar.

You also will have possible pressure issues to deal with?

Good luck

I had to replaced the fuel pump at 70k miles last summer on my 2004 325ci and prior to that I had fuel gauge problems at 38k miles. At the time I was not using very good fuel due to location in a rural area. I attributed to bad fuel for the gauge problems and may be fuel pump going out. Any validity with the bad fuel causing the pump to go out? I'm a new member and tried locating what gasoline is recommended on the forum(?). I use Shell and Chevron fuel despite costing .5 cents more than other stations.

^ That's a loaded question because everyone is right on fuel. I would not blame it on your application though.

Fuel is not really the reason the pumps or sending units are failing.

The fuel pumps fail as they are basic DC brush motors and they do not last forever. If they went to a brushless AC motor design, this would at least eliminate the brush problem, but there would be bushing, AC controller and other issues.

The senders sometimes get a bad reputation as many times a soft failing fuel pump does not properly empty the drivers side fuel tank and you run out of fuel with 1/4 tank showing. This is more of a fuel pump pressure & volume issue.

Now the ethanol added into the fuel is probably not very good for any of the plastic components in the fuel systems. Ethanol percentage is not very well regulated and it is not uncommon for higher than 10% ethanol to show up often.

Also the ethanol also absorbs much more water and water vapor so this added moisture/water can add to the corrosive nature of the fuel.

The pump from bma comes with the sending unit correct ?

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Maybe you can help me out in troubleshooting this issue on my brother's car. The car cranks but won't turn over, and when it does, it dies. I checked the fuel pressure and it is at 0 psi. Swapped the filter and pump and still no pressure. Any inputs?

Originally Posted by murac14

The pump from bma comes with the sending unit correct ?

Sent from my PC36100 using Bimmer App

the passenger side saddle tank is where the fuel pump/sender combination installs. The driver's side saddle tank has only a sending unit, of which the car obviously has two.
Look on "e46 fuel pump" youtube.com for instructions.

And order yourself a new gasket for each install.

Originally Posted by 668Ci

Maybe you can help me out in troubleshooting this issue on my brother's car. The car cranks but won't turn over, and when it does, it dies. I checked the fuel pressure and it is at 0 psi. Swapped the filter and pump and still no pressure. Any inputs?

Check voltage to the pump? Hear the pump running?
Check the fuse for the pump?

Install the fuel filter correctly? It is complicated with multiple tubes.

I checked the fuse and hear the pump running. Hoses were labeled so installation wasn't the issue.

Originally Posted by murac14

The pump from bma comes with the sending unit correct ?

Yes, it is a fully integrated pump with sending unit.

Originally Posted by 668Ci

I checked the fuse and hear the pump running. Hoses were labeled so installation wasn't the issue.

You sure there is not fuel pressure? It may be that the fuel pressure gauge is not depressing the valve??

The other issue is how much fuel is in the car?

If the car has only 1/4 tank, the passenger side if the tank may be empty.

Suggest you read the 3rd link in my signature and figure out how much fuel is actually in the passenger side of the fuel tank. You may need to add a few gallons of gas to the car?

Yea, the Fuel pressure tester was tightly connected to the shrader valve. No fuel came out of the valve also. I checked the readings but forgot what they were, I'll double check and I will try to add a couple of gallons. Hope it works.

Originally Posted by 668Ci

Yea, the Fuel pressure tester was tightly connected to the shrader valve. No fuel came out of the valve also. I checked the readings but forgot what they were, I'll double check and I will try to add a couple of gallons. Hope it works.

When you put in the new pump, surely you made some notice of how high the gasoline level was in the tank?
Or was it down to the bottom completely below where the fuel pickup was?