engine problem
FTE Community Team
Joined: Nov 2001
Posts: 1,873
Likes: 276
From: Oak Harbor, Washington
engine problem
> 1990 4.0 Aerostar
> There is gas in the oil, turned oil blue.
Blue? Weird.
> What would cause this? Please explain in detail.
My two cents, and only guesses:
1) Failed fuel pressure regulator diaphragm (maybe)
2) One failed injector (leaks excessively when engine is turned off)
3) Failed vapor/liquid separator in the fuel tank vent system
I'd expect both Nos. 1 & 2 to affect the way that the engine runs, especially startup after being shut down for only a few minutes.
On most carbureted engines, you'd be looking at a failed fuel pump diaphragm, but that doesn't apply to yours.
Sorry that I can't explain in detail. I hope somebody else has better guesses.
Regards,
Al S.
> There is gas in the oil, turned oil blue.
Blue? Weird.
> What would cause this? Please explain in detail.
My two cents, and only guesses:
1) Failed fuel pressure regulator diaphragm (maybe)
2) One failed injector (leaks excessively when engine is turned off)
3) Failed vapor/liquid separator in the fuel tank vent system
I'd expect both Nos. 1 & 2 to affect the way that the engine runs, especially startup after being shut down for only a few minutes.
On most carbureted engines, you'd be looking at a failed fuel pump diaphragm, but that doesn't apply to yours.
Sorry that I can't explain in detail. I hope somebody else has better guesses.
Regards,
Al S.
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