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E90/E91/E92/E93 (2006 - 2013)
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Old 05-01-2013, 05:26 PM
jelliotlevy jelliotlevy is offline
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Mein Auto: 2011BMW 335i, Honda S2000
2011 335i - The dreaded HPFP

This came as a surprise to me. Our 2011 335i, now at 24,900 miles. It had been running faultlessly, till Monday. Out of the blue, while quietly trolling at about 35 mph, I got the yellow symbol of a 1/2 engine, and a warning of reduced power. The car would run normally if I drove like Grandma, but would not produce power if I hit the gas hard. Example: At 50 mph, hard throttle would produce about 5500 rpm (probably 2nd gear), a lot of noise and very little acceleration. Smooth cruising at 60 mph felt normal.

The dealer tested the High Pressure Fuel Pump, and found it faulty. Replacement has cured the problem. The car's date of manufacture is November 2010, so it certainly has the new design fuel pump. I find myself wondering if this is just a random failure, or if faulty fuel pumps are still being discovered. I especially worry, since the Government, in its wisdom, and under the influence of the Corn Lobby, is considering raising the ethanol content of our gasoline from the current 10% up to 15%. I am much suspicious that ethanol has been the culprit in the HPFP saga. Any thoughts out there?
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Old 05-01-2013, 06:02 PM
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Zeichen311 Zeichen311 is offline
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Mein Auto: '11 335xi Sedan
Quote:
Originally Posted by jelliotlevy View Post
I find myself wondering if this is just a random failure, or if faulty fuel pumps are still being discovered. ... I am much suspicious that ethanol has been the culprit in the HPFP saga. Any thoughts out there?
Yes. An HPFP failure is not necessarily THE HPFP failure.

The cause of the chronic problem was long ago isolated to be cavitation, ultimately cured by a pump redesign and a software fix to prime the low-pressure (suction) side of the pump before engine start.
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   N47 35' 30.13" E11 10' 33.36" - End of break-in...you can guess what came next. BMW CCA
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Old 05-02-2013, 07:19 AM
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Zooks527 Zooks527 is online now
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Location: Mansfield, MA
 
Join Date: Mar 2009
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Mein Auto: 2009 335i xDrive coupe
Yeah, pumps is pumps. Eventually, as with all mechanical items, they'll all fail (HPFP, LPFP, water pump, etc.). You just got the left side of the bell curve on yours.
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ED May 12, 2009, Munich dropoff May 16, Redelivery June 22, 2009




Prior 33 years of cars: 1967 BelAir wagon / 1968 LeMans Tempest / 1970 Mustang Mach 1 / 1972 El Dorado / 1978 Corvette (kept until first Bronco) / 1981 Subaru GL wagon AWD / 1983 s10 Blazer 4x4 (big mistake) / 1985 Bronco 4x4 / 1996 Bronco 4x4 / 2004 Passat 4motion
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