KHE Posted September 14, 2014 Report Share Posted September 14, 2014 The starter is fine - it spins the engine at the proper speed but the engine takes longer to start and come up to the fast idle speed. Other than that, it drives fine. On very rare ocassions, it will stall. I connected a fuel pressure gage to the fuel rail and with the key on, engine off, the fuel pressure was 27 psi. Definitely lower than the 42-48 psi spec. in the ship manual. Once the engine started, it came up to 42 psi but dropped off when the engine was revved. The pressure should not drop off when it is revved up - it should increase slightly since the drop in vacuum would keep the regulator from opening. I turned off the engine, clamped the rubber portion of the fuel return line to prevent any fuel from being returned to the tank - that will result in the maximum pressure for the pump. Key on, engine off: 27 psi fuel pressure. I'm thinking that the fuel pump is weak. I need to verify the pump connections to make sure there is a full 12 volts there but it sure looks like I need to replace the fuel pump. It looks like the whole sending unit needs to be replaced. Quote Kevin '93 Fleetwood Brougham '05 Deville '04 Deville 2013 Silverado Z71 Link to comment Share on other sites More sharing options...
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