Eco Boost Fuel Presure
05-30-2011, 02:38 PM
#11
Yes BMW recalled all of the HPFP's because of this I had 2 fail on me in 3 years. Another problem is the high pressure piezo fuel injectors which I had all 6 replaced on my 335.
Seems to be hit and miss with these as some guys never had an issue. Most had their pumps fail hence the recall which slowly moved onto the injectors hence the 2nd recall. BMW programs the injectors to the car so you simply cant buy one and install it which I think is a money grab.
It was a bit of a hassle but not too bad, I'm glad I had the warranty tho. With these new trucks I'm interested to see what happens 1-2 years from now.
Seems to be hit and miss with these as some guys never had an issue. Most had their pumps fail hence the recall which slowly moved onto the injectors hence the 2nd recall. BMW programs the injectors to the car so you simply cant buy one and install it which I think is a money grab.
It was a bit of a hassle but not too bad, I'm glad I had the warranty tho. With these new trucks I'm interested to see what happens 1-2 years from now.
Hopefully Ford did not make this mistake but the HPFP is a precision part that has to hold up to a lot of pressure. It will be interesting to see how this turns out.
05-30-2011, 04:30 PM
#12
Senior Member
Yes, true the ethanol content has been thought to be the main contributing factor to the hpfp failures. Seems the ecoboost (SHO & Flex) have not been affected by this.
05-31-2011, 10:30 AM
#13
This appears to be one difference between the gas DI Engines vs. Diesel DI engines.
IIRC, and this may have changed over the years, Diesels used a "Lift" pump in the tank and a high pressure pump for the DI up on the engine somewhere.
These gas engines are pushing the whole 2200PSI from the tank up to the engine all alone.
I believe I would have preferred the old method, which has decades and decades of proven reliability.
I sure hope dealers keep these in stock if they are a problem.
IIRC, and this may have changed over the years, Diesels used a "Lift" pump in the tank and a high pressure pump for the DI up on the engine somewhere.
These gas engines are pushing the whole 2200PSI from the tank up to the engine all alone.
I believe I would have preferred the old method, which has decades and decades of proven reliability.
I sure hope dealers keep these in stock if they are a problem.
05-31-2011, 10:36 AM
#14
I read somewhere that the HPFP problems BMW experienced were due to the ethanol content of American fuel. I don't think Siemens designed the fuel pump to work with ethanol and that is why the pump failed often and repeatedly in the American market. I don't think they had these problems in the European market.
Hopefully Ford did not make this mistake but the HPFP is a precision part that has to hold up to a lot of pressure. It will be interesting to see how this turns out.
Hopefully Ford did not make this mistake but the HPFP is a precision part that has to hold up to a lot of pressure. It will be interesting to see how this turns out.
The old trick of running them dry doesn't work any more. It leaves just enough in the bowl for the Ethanol to attract moisture, and the when the next season comes around you have the same problems all over again.
I've been actually having better luck now leaving them wet with some fuel well doused with Fuel Stabilizer in the tank.
The only piece of equipment I own that seems to have not been affected past the first event is my old Cub Cadet 1864 Tractor and it's 18HP Kohler Command engine.
My two stroke stuff is a friggin nightmare at the start of each season. I've got an Echo 260 trimmer that appears to have had the carb completely destroyed by this crap gas. It was an expensive trimmer, and has less than 30 minutes of run time on it. The last time it ever ran was 2 years ago. I play with it every year until I get pissed off at it and put it back in the shed, but so far it's still dead.
I actually had to have cortisone injections done on my elbow from cranking on that
damned thing.
05-31-2011, 12:25 PM
#15
Senior Member
05-31-2011, 12:31 PM
#16
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Originally Posted by TruckLarry
This appears to be one difference between the gas DI Engines vs. Diesel DI engines.
IIRC, and this may have changed over the years, Diesels used a "Lift" pump in the tank and a high pressure pump for the DI up on the engine somewhere.
These gas engines are pushing the whole 2200PSI from the tank up to the engine all alone.
I believe I would have preferred the old method, which has decades and decades of proven reliability.
I sure hope dealers keep these in stock if they are a problem.
IIRC, and this may have changed over the years, Diesels used a "Lift" pump in the tank and a high pressure pump for the DI up on the engine somewhere.
These gas engines are pushing the whole 2200PSI from the tank up to the engine all alone.
I believe I would have preferred the old method, which has decades and decades of proven reliability.
I sure hope dealers keep these in stock if they are a problem.
05-31-2011, 02:10 PM
#17
BMW eventually warrantied all existing HPFP fuel pumps in N54 motors to 10 years/120k miles but last I heard they had not actually redesigned the part. Until it is redesigned 335i owners will just have to live with fuel pump failures.
05-31-2011, 02:32 PM
#18
Senior Member
Actually they did redesign twice now with a new manufacturer and still failing fuel pumps. I always filled with Shell due to no ethanol but I guess I was wrong. Ford seems to have done a much better job than BMW designing their pumps.