1993 Johnson Evinrude "ET" 9.9 thru 30 Service Manual, P/N 508282, Page 70Get this manual
Function Test
Conduct this test with the motor in test tank or on the boatBefore testing, loosen fuel tank gas cap momentarily to release any pressure that may have built upFuel tank must not be more than 24 in(61 em) below fuel pumpr:;-] 1Remove carburetor to fuel pump hoseConnect fuel pressure gauge (obtain locally) between the carburetor and fuel pump