Moody Fuel Pump ????

[Cwgrl]

Hi All! Happy Holidays....

Sometimes, especially when the weather is a little colder. It takes several tries to start the truck.

I turn the key to the on position several time before I hear the Fuel Pump hum...then it will start fine....

I can hear the relay clicking. Also, did a full tune-up last month. No CEL, and Passed smog last week

Any ideas... maybe a bad ignition?

 

[Cwgrl]

anyone?

 

[410Fortune]

You may not be hearing the fuel pump relay, there are several other relays and sensors that will click and hum when you turn the key to "on"

I would CHANGE the relay first and have a look at the wiring connections where it plugs in (sometimes the wires get pushed down or corroded or both)

If it still does it then I would say yes it is very likely your fuel pump is on its way out, BUT you can easily check for + at the pump wires when the key is turned to verify its not the wiring.

Usually they get weak then quit, when the truck is warm does it happen more often?

 

[Turdle]

Also,
You might notice if the "check engine" light illuminates with the first time you switch it on.

The PCM relay also clicks on at this point, and no PCM power =no fuel pump power. In other words, 2 relays need to "click on" .

 

[410Fortune]

ding ding beep wrrrrrrrrrrrrrrrrrrr fffffffffffffffffffff ding ding ding

Ah the ol Gen II start up song

 

[Cwgrl]

The one thing I don't understand is..... when the weather is warmer it does not have this problem. Only when the weather drops below 65. :scratch:

The last few days the weather has been in the 80's, and no problem starting....

I'm soooo confused. LOL

 

[Tbars4]

..:scratch:..Where are you located so we could rule out some other possibilities???

 

[Turdle]

Which engine is in your explorer?
On a cold morning, try this just to humor me-and rule out the fuel pump.

Cycle the key on and off about 4 times, with a 2-3 second pause while on each time.
On the 5th switch on, go ahead and try to crank the engine.

If it starts right away it would ( to me anyway) indicate a fuel pressure issue. may be a bad fuel pump, or, maybe the fuel sock is clogged and gelled up? Maybe a clogged fuel filter?

The technician way to troubleshoot this would be to attach a fuel pressure gauge before the cold morning start-and watch the fuel pressure. The method above will be an easy way to determine if you need to go to the trouble, maybe?