Walbro will have a W engraved on it. It will be all silver with a white sock filter and black top. And it will have a plug on the top of the pump itself with a red and black wire lead coming out and running to the stock wiring.

Since your's says Denso..it is probably OEM.




Fuel pump housing on the left (Notice Red and Black wire leads with plug)
Stock Fuel Pump in the center.
Walbro on the right.