It’s not clear in the manual what this hand priming pump looks like, so I have attached a pic. The hand primer is stored behind the passenger seat in a resealable plastic bag,
I have used it a few times after changing fuel filters and each time the vehicle stalls down the road after several klms of running. I then prime it again and no further issues.
Apparently if the engine is cranked for more than 15 seconds between prime attempts then the piezo injectors can overheat and damage permanently. I wonder if that happened to yours before you purchased it?
I am currently experimenting with a 4psi electric fuel pump sucking where the hand primer would attach. Currently waiting on connectors to test. This is an alternative to pressurising the tank as you suggest and more in line with what the hand primer does. Probably no difference in result though. I would avoid cracking the injectors and anything else suchlike. If you simply remove the cap on the end of the line where the hand primer attaches then that should allow the air to escape when you pressurise the tank.
Because Nissan fail to provide complete advice, “replacing the fuel filter” on the STX550’s have cost some owners dearly, ending up in new injectors, fuel pumps etc.
I can see how replacing a fuel filter and having problems could cost $9,000 for a new injector set plus whatever a new fuel pump costs, let’s guess almost as much as the injectors. Replacing the pump was probably not required but seemed to be the next step in the problem solving process at the time.
I am hoping to achieve a guaranteed priming tool using the electric fuel pump so I know where I am.
