If it's hard to start after sitting for long periods of time, you may have a faulty fuel pressure regulator. The FPR is designed to hold pressure in the fuel ling after the engine is shut off. This is to supply fuel to the injectors when ever you're ready to turn the engine back on.
If the FPR is leaky, it'll bleed off the pressure so when you are ready to start it, you have to wait for gas to travel from the tank to the engine.
Also, if theres a leak in the diaphram of the FPR, it'll supply too much fuel to the engine, creating a flooding situation similar to a carb.
Also, there could be water in the tank/lines. This will also create a hard start/rough idle at start up, until the engine uses it all up.
First thing to do, pull the vacuum line connected to the FPR and smell/feel for gas. If there's any, replace it. Next hook up a pressure gauge and turn key on/engine off. The pressure should read between 39-45 PSI. Turn the key off and the pressure should hold. Wait a couple hours to be sure. Sometimes a FPR will leak down extremely slowly. If it drops more than 5 PSI, replace it.
Saturday, February 5th, 2011 AT 10:48 PM