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Posted 16 August 2009 - 07:12 PM
so I got called to look at a dead Mercedes, but after it sat overnight it fired right up
then died again 2 days later
it seems like, there is a fuel pressure regulator that is not passing fuel to the distribution manifold
there is the inlet from the pump, a line to the fuel distribution block, a small return line and a vacuum line to the air cleaner housing
I THINK the return line is for any fuel in the regulator when the throttle is snapped shut or demand for fuel drops off - it has somewhere to go and does not keep the valve in the regulator open
I THINK the small 'vacuum line' is actually for any leakage past the spool valve seals, not to move the valve - more of an emissions thing and it creates a small negative pressure on the opposite side of the valve
here's the kicker, Mr.Bosch fuel regulator is $900 !!!
the next logical step is to check the fuel pressure being supplied to the regulator - if the pump is weak it wouldn't unseat the valve and allow fuel to flow to the manifold - hence no fuel getting past the regulator
but it occured to me I have an extra Subaru FI fuel pump... is the world ready for a Mercedes GL Wagon hybrid?
Posted 24 August 2009 - 05:25 PM
Posted 24 August 2009 - 05:33 PM
Subarus do have a very bosch-like fuel injection, so the fuel pump might work.
Posted 26 August 2009 - 10:22 PM
that was very very educational, I am glad my venerable ea82 is still a 'mechanical car' to a large part, and not as crazy with the electronics, relays and such - sure we have a few items but...
sort of like an A-10 versus an F-22 both very good at their jobs, just two different ways in going about it
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