So my 2002 Ford F-150 lariat has these codes. I'm not able to find a vacc leak anywhere. I hooked up a fuel pressure tester and got these results. Plugged it in to the shraeder valve on bank 1 of the fuel rail. Turned the key to the on position and the fuel pressure stayed at zero. Then I started it up and went to 30psi. Reved the engine and in turn boosted it to 40psi. Now as soon as I shut it off the pressure goes to 0psi. I'm assuming these "too lean" codes are stemming from a fuel issue? So as it was running I pulled the vac line on the fuel pressure regulator. It has plenty of suction. But I could smell an extremely faint gasoline smell in the vac line. When it was off of course. Where do I go from here? I'm sure running too lean isn't good for the engine.

 

main cause for those codes, is intake manifold gaskets. One way to check those gaskets with out tearing into it would be to spray like a carb cleaner (somebody here will give you the exact spray to use im sure, i only say carb cleaner cause im having a brain fart right now haha) around the intake manifold with the truck on, if the truck accelerates youve found your leak. also i think there is a thread already with these codes and repairs out there

 

Ya I've actually done this already. I'm not getting any results. I'm thinking the intake manifold gaskets are fine. I'm lost here....