Motor bogging down after idle

[Riley1840]

I have a Nissan 4 stroke Efi 30’ hp [NSF30B]. After idle thru no wake zone motor acts like it is starving for fuel, will barley come up to 2k rpm. It does this when running on on board tank.
I have cleaned tank, checked and cleaned vent, changed fuel hose and bulb. I can change to auxiliary tank and up until yesterday it would run fine. Yesterday after changing tank motor ran about 5 minutes then slowly started losing rpm. One other thing I would do w]hen on inboard tank and it would bod down was shut engine off’ for 10 seconds then then start and it would run good till next idle zone. I thought fuel pump, but need some advice. Thanks

 

[pvanv]

check fuel pressure. Also see if pumping bulb helps.

 

[Riley1840]

Pumping bulb did not help. I’m not sure how to check pressure.

 

[pvanv]

There is a schrader valve on the fuel rail to chk pressure. Could be the high pressure pump (FFP) or the ECU.

 

[Riley1840]

Ok will get a pressure reader from store and will repost with results. Thank you. Have also ordered high pressure fuel filter.

 

[Riley1840]

Update. Sorry for delay but had to wait on part and time to work on motor. What I did was change fuel lines on motor and put a new high pressure fuel filter on. After checking pressure at schrader valve.. motor is running very good now. Thanks for the help.