2 weeks ago
2 weeks ago
Have a 07 250hp etec.
I checked fuel pressure which has been good even ran from a portable tank today and same thing happened.
What were the lift pump pressures and the electric pump pressures at idle, cruise, full throttle and when the engine started to stall? Have you tested for air bubbles in the fuel lines with a piece of clear fuel hose and checked for fuel restrictions using a vacuum gauge?
If these tests should be performed by a trained tech if you are not familiar with them, don't have the requred service manual and gauges, or are uncomfortable with the procedures.
One thing to check also is the venting system on the fuel tank. Be sure there is no vacuum buildup in the gas tank after running for a while.
There could be other issues causing the symptoms but more commonly there is something fuel related.
Sunday - last edited Sunday
So I definitely think it is fuel. I cleaned the vst filter and the motor still would die but seemed to start a little quicker not 30 to 45 min after it shut down. Only checked the high and low fuel pressure at idle. Low was at 6 and high was at 32. Did check fuel for air in between external 10 micron water separator and motor with clear line and there were no air bubbles. I did notice a very small crack above where you would check high pressure on pump. It does seep fuel very slowly. Would this cause the motor to die?
A crack in the fuel system on the high-pressure side that seeps gasoline is a dangerous situation. The VST should be replaced.
After the engine quits and will not start for a while, has the ignition or EMM or crank position sensor been checked for proper operation. A clip-on timing light would show if the ignition system was still operational after the motor stalled.