Originally Posted by
Mydmc5898
I'm just curious because it seems to be an intermittent issue.
All day it was running and starting fine, left work stopped to get gas and boom, stopped starting.
I want to identify all mechanical possibilities.
Yes, the hot no-start condition you describe is consistent with either a bad accumulator or a fuel leak, even a tiny one, somewhere between the pump and the pressure regulator. Could also be a bad check valve in the pump. These are all mechanical possibilities (bad components and not bad computer).
Here is what Bosch tells us about the function of the accumulator in the K-Jet system - read it carefully and consider it against the symptoms:
"Fuel accumulator
The fuel accumulator maintains the pressure in the fuel system for a certain time after the engine has been switched off. When the engine is running it serves to deaden the noise of the electric fuel pump. After the engine has been switched off, the fuel accumulator maintains the pressure in the fuel system in order to facilitate re-starting, particularly when the engine is hot. The design of the accumulator housing is such that it deadens the noise from the fuel pump when the engine is running. The interior of the fuel accumulator is divided into two chambers by means of a diaphragm. One chamber serves as the accumulator volume for the fuel, the other chamber contains a spring. During operation the accumulator chamber is filled with fuel. This causes the diaphragm to bend back against the force of the spring until it is halted by the stops in the spring chamber. The diaphragm remains in this position, which corresponds to the maximum accumulator volume, as long as the engine is running."