I went down to the boat yesterday to test the fuel pressure, I used the schreder valve, for the low side, how do I test the high side there are no ports, also there are 2 relays in front of. The throttle body, one if I jump it the fuel pump runs (left side relay) the other one does nothing if I jump it. Does anyone have a schematic of the engine it's a 5.7gsi pefs