I replaced the fuel pump in my truck about 2 months ago, and i guess i didn't get a good seal on the top with the o-ring. My check engine light has been on ever since with the code P0440, but today it just started running rough, and while i was on the freeway the check engine light started blinking.. I got the truck to limp home, having to keep it above 2000rpm at idle to keep it from dying... when i got home i read the codes, came up with 4: P302, P0440, P0302, P0440...any suggestions on this?

 

Cylinder #2 misfiring. Check everything associated with #2 cylinder. Spark plug, wires, dist cap, injector etc. It would also be a good idea to fix the seal at the top of the tank.

 

yeah, i know, i really do need to fix that seal on the tank. do you think that with it not having a good seal, and the pressure being messed up that it could have affected the injectors?

 

If the pressure is too low then it definitely will affect the injectors and the engine. I don't think the seal would because I have left the cap loose by accident and the truck ran great. It did throw a code.

 

I just wanted to write back and say thanks for the advice. I ended up changing out all my spark plugs and wires, then i was throwing code for multiple cylinder misfire. So then i decided to change my distributor cap, and that fixed the problem. Thanks again!