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.

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.

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.

So far this !@#$!@#$ 10% ethanol fuel has taken out every piece of gas powered lawn equipment I own, and thats about 9 different pieces. I have had to overhaul EVERY single carburetor at least once.

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 :censored:damned thing.

if the ethanol content was a factor, wouldnt the SHO and Flex exhibit similar issues?

Didn't know that. Aircraft are like that also. You have a boost pump that pulls from the tank and pushes gas upstream and a fuel pump on the motor that sucks it into the engine and pushes it to the fuel control and injectors.

I doubt it would be a problem if Ford engineers designed the part to work with a certain ethanol content. I think BMW's problem was that they designed it to work with pure gasoline (no ethanol in their gas over there) and the some of the plastic innards were not designed to run on ethanol. After a few thousand miles the ethanol corroded them to the point of failure. I don't see any reason why an American part, designed for use in the American market, would have similar problems.

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.

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.