Fuel Problems 200 EFI

[Bad Vette]

I?m working on 1991 EFI Mercury 200 XRI.
? It has good compression and appears to have good spark.
I can get it to started by pumping the full bulb hard enough to fill the inline filter but filter runs dry and engine quits. Sounds simple enough obviously a fuel problem, but where?
I think fuel is making it past the crankcase operated pump. I notice that the electric pump gets hot, could this be frozen and is this common when they fail. Could there be a restriction upstream of the elec pump, like in the injectors that would cause it to heat up?
The engine has sitting for 2 years.
Thanks in advance for any suggestions.
Bad Vette

 

[Bad Vette]

Re: Fuel Problems 200 EFI

How can I be sure of the year? I looked for serial # and can't find it, am I looking in the right place. I thought it was stamped on the steering housing above the transom clamp?
Thanks

 

[CharlieB]

Re: Fuel Problems 200 EFI

EFI pump is good, that pump makes the high fuel pressure and the engine would NOT run at alll without it.

Your problem is in the low pressure fuel transfer pump, it is not supplying fuel to the vapor separator for the high pressure pump.

In essence your hand has become the low pressure pump squeezing the primer.

Test the pump and lines between the primer and the low pressure pump for air leaking INTO the lines. Replace suspect lines and rebuild the pump, verify pump flow, extend hose to a suitable container, prime, then crank engine and observe fuel flow.

I'd highly recommend a new water pump impeller before that 200 gets on the water after sitting a couple of years, you'd hate to melt it down because of poor water flow.