How often should the fuel pump prime itself when the truck is just sitting there?

[Dinglehead]

....because I’ve heard it make that little clickwhrrrr sound about 5 times in the last hour while working out in the garage.

there’s no way that’s normal right? What’s going on here?

Sponsored

 

[Samsquanch]

A few people have noticed this recently as well. See the “fuel in oil” thread. When they eventually resolve that issue I won’t be surprised if this is related.

Can’t be normal to have the fuel pump constantly priming like that but it seems to be common. I was in the driveway the other day and heard mine going off.

 

[Dinglehead]

A few people have noticed this recently as well. See the “fuel in oil” thread. When they eventually resolve that issue I won’t be surprised if this is related.

Can’t be normal to have the fuel pump constantly priming like that but it seems to be common. I was in the driveway the other day and heard mine going off.

For some reason it seems to be doing it really frequently now. I wonder what the hell is going on.

 

[Samsquanch]

For some reason it seems to be doing it really frequently now. I wonder what the hell is going on.

Prob worth taking it to the dealership. Maybe you have a leaky injector or something. If pressure can’t be maintained it might just keep priming. Just a guess on my part.

 

[Dahveed]

For some reason it seems to be doing it really frequently now. I wonder what the hell is going on.

Did you have your keys on you? Since you have a Lariat I assume it has Intelligent Access. It may be priming the pump when it detects the fob nearby. My XLT primes when I open the door.

 

[JACER]

My Lariat also only primes when a door is opened.

 

[AzScorpion]

My Lariat also only primes when a door is opened.

Mine will do it while closed too but mostly when the door is opened. I still say mine is possessed.

 

[Toytec]

If you only knew how much fuel pressure is in a direct injection pump. Remember, our trucks don't have port injection and a low pressure fuel pump.
Short story: it primes when it needs to.

 

[Dinglehead]

If you only knew how much fuel pressure is in a direct injection pump. Remember, our trucks don't have port injection and a low pressure fuel pump.
Short story: it primes when it needs to.

Ive been paying attention today. I put my keys in the house and have heard it prime 5 times so far throughout today no door opening or anything.

why would it need to prime so frequently when not being used?

 

[Dinglehead]

Oil level seems normal but definitely has a gas smell. Nothing too overwhelming but it’s there.

 

[myothercarizahearse]

I have never heard any clicks coming from my truck when around it other than unlocking the doors. I have XL trim with no fancy electronics. the oil has always had a slight gas smell but stays at a constant level. so far 2 oil changes down and haven't had strange dirty oil coming out at ~5000 miles each

 

[Toytec]

"why would it need to prime so frequently when not being used?"

I can't answer that. It's all in what the monitors see in the engine computer. I can tell you this, my truck does it too as I'm in the garage a lot myself. But I pay it no mind.
Do you have leaky injectors? I can't answer that either, but I do know what a super rich cylinder is like on initial start up and my truck has never done it.

So, if you're concerned, take it in. If I was there I'd have a scan tool in hand looking at all the parameters of cold start up, such as injector volume, o2 sensor readings, cylinder imbalance, and fuel pressure. Then I compare this to another same vehicle just to show you it's characteristic of the truck. You can quote me on that to the service writer.

 

[SymChris]

Just wondering, but is it only, always the high-pressure fuel pump (hpfp) that is “doing it’s thing”?

I was seeing over in the Bronco Sport forum of how a “fan” sound coming from the front was part of the headlamp assembly. Apparently it can run for upwards of 20 minutes and is to prevent inside condensation. That’s a new thing I’ve just discovered.

With all these electronic components I’ve always figured it’s a few things going on to prepare itself for driving.

Kinda like your dog getting the leash and dropping it at your feet...

 

[Joeiconic]

Has there been actual confirmation that the periodic noise is priming the fuel pump? Maybe is just waking up periodically checking for software updates or other self diagnostics?

 

[Toytec]

Exactly.
Another thing is a timer built in the ECM to run a "self check" of the evaporative emissions system. This will occur exactly 5 hours after vehicle has been driven.

Sponsored