2004 Suzuki 50 fuel injected problems

[Me miller]

My 2004 Suzuki 50 hp fuel injected runs for 30 seconds and quits what could be the problem. New gas was put in an fuel filter was cleaned.

[boats.net]

Test fuel pressure to see if holding pressure when shuts off, check for spark on all cylinders.

[Me miller]

Testing fuel pressure

How do you test the fuel pressure to see if it is holding?
Thanks

[boats.net]

Have to have a fuel pressure tester connected to it.