Question:

4.0 V6   This happens after I drive it and get it up to temperature.  Then, when I shut the engine off and try to start it about 5 min. later, it won’t.  I’ve replaced the Egnition Coil, Plugs and Plug Wires.  I’ve heard that maybe the fuel pump needs to be replaced but it wasn’t a professional opinion. I don’t want to spend the money and time trying to repair the truck again on something that may not be the problem. I need some kind of definite answer oon what is wrong.  Help PLEASE!!

Response:

Just a thought – will it start if you push on the gas pedal?  If so, the idle air control valve is the problem. – Hide quoted text — Show quoted text – >4.0 V6   This happens after I drive it and get it up to temperature.  Then, >when I shut the engine off and try to start it about 5 min. later, it >won’t.  I’ve replaced the Egnition Coil, Plugs and Plug Wires.  I’ve heard >that maybe the fuel pump needs to be replaced but it wasn’t a professional >opinion. I don’t want to spend the money and time trying to repair the >truck again on something that may not be the problem. I need some kind of >definite answer oon what is wrong.  Help PLEASE!!

Response:

This problem was talked here previously. The solution is to change the fuel pump relay. When it get hot it won’t start. You can take a look in previous post in the forum about this issue. Hope this will work for you. Regards Marc – Hide quoted text — Show quoted text -> 4.0 V6   This happens after I drive it and get it up to temperature. Then, > when I shut the engine off and try to start it about 5 min. later, it > won’t.  I’ve replaced the Egnition Coil, Plugs and Plug Wires.  I’ve heard > that maybe the fuel pump needs to be replaced but it wasn’t a professional > opinion. I don’t want to spend the money and time trying to repair the > truck again on something that may not be the problem. I need some kind of > definite answer oon what is wrong.  Help PLEASE!!

Response:

> 4.0 V6   This happens after I drive it and get it up to temperature.  Then, > when I shut the engine off and try to start it about 5 min. later, it > won’t.  I’ve replaced the Egnition Coil, Plugs and Plug Wires.  I’ve heard > that maybe the fuel pump needs to be replaced but it wasn’t a professional > opinion. I don’t want to spend the money and time trying to repair the > truck again on something that may not be the problem. I need some kind of > definite answer oon what is wrong.  Help PLEASE!!

Tough call without some diagnosis. With the radio off, turn the key "on" & listen for the fuel pump hum. It should run 2-3 seconds & shut off. You may want to try swapping the fuel pump & heater motor relays in the under hood relay box. Worst case is you have no heater fan…. Pull a plug wire & check for spark while someone turns the key to "start". No spark means you need to check further. One possible problem is a bad crankshaft position sensor that comes open when it heat soaks from a shut-down engine. Again, without diagnostics it a shot in the dark.

Response:

Thanks for the responses.  It was the relay switch!!!!! When I tapped the switch, the fuel pump would kick on.  Now that it’s replaced it works fine.  Thanks a lot!

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