I recently had to replace my fuel pump in my van lying on my back in the middle of a snowstorm in a hotel parking lot in Frisco. Granted, the vehicle has 194,000 miles on it, and I don't know if this part had ever been replaced, but I do an awful lot of engine-on-DFCO coasting here in the mountains.
I've had this van since 10/09 and the previous owner had told me that he averaged about 17 MPG. Since October I've been averaging about 26.5 MPG, so that's about a 55% improvement.
I'm wondering if the fuel pump was just at the end anyway, or if I led to it's premature demise by engaging DFCO whenever possible, and letting that pump pressurize a fuel system that wasn't getting it's normal release through the injectors?
Any expert opinions on DFCO??