How to tell if my outboard is DFI?

pfd161

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Previous owner insists it is...

it is a 1993 yamaha 175 salt water series.

Model 175TXRR
Serial 755652

Thanks.
 

ocnslr

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And the carbed models were replaced by EFI engines, with injection into the intake manifold. DFI engines came later, with injection into the cylinders.

Our 2001 250HP OX66 was an EFI engine.