When I start my truck after is has been sitting for a day or two, I get a light tick/tap towards the bottom rear drivers side of the motor. After the truck runs for a minute, the ticking stops. I never hear it any other time. It does it when the oil is new or old. I am still running dino, maybe a synthetic would help?

Ideas are appreciated!

TIA!

-mad

 

mine seems to do that also. it seems to line out when it gets warm

 

I've heard that, but only on autos... Could it be the converter or something in the transmission ticking until it gets oil?

Just a guess...

 

Could be... I'll get under it next time.

 

it's completely normal and is the air being purged from the fuel lines. It automated on the newer trucks. No more manual bleeding of the lines.

 

Even on trucks with aftermarket fuel pumps? (GDP 392)

 

it doesn't have anything to do with the aftermarket LP. here's info on the stock purging.....

edit:

A certain amount of air becomes trapped in the fuel system when fuel system components on the supply and/or high-pressure side are serviced or replaced. Fuel system priming is accomplished using the electric fuel transfer (lift) pump. Servicing or replacing fuel system components will not require fuel system priming. The fuel transfer (lift) pump is self-priming: When the key is first turned on (without cranking engine), the pump operates for approximately 1 to 2 second and then shuts off (Note: When ambient temperatures are cold enough to cause the intake air heaters to operate, the fuel lift pump will operate during the entire intake air pre-heat cycle). The pump will also operate for up to 25 seconds after the starter is quickly engaged, and then disengaged without allowing the engine to start. The pump shuts off immediately if the key is on and the engine stops running.

1. Turn key to CRANK position and quickly release key to ON position before engine starts. This will operate fuel transfer pump for approximately 25 seconds.
2. Crank engine. If the engine does not start after 25 seconds, turn key to OFF position, and leave it off for at least 5 seconds. Repeat previous step until engine starts.
3. Fuel system priming is now completed.
4. Attempt to start engine. If engine will not start, proceed to following steps. When engine does start, it may run erratically and be noisy for a few minutes. This is a normal condition.

CAUTION: Do not engage the starter motor for more than 30 seconds at a time. Allow two minutes between
cranking intervals.
5. Perform previous fuel priming procedure steps using fuel transfer pump. Be sure fuel is present at fuel tank.
6. Crank the engine for 30 seconds at a time to allow fuel system to prime.


It also could be the FCA which is also a solenoid controlled by the ECM.

here's some info about the fuel system from the manual.....

Fuel enters the system from the electric fuel transfer (lift) pump, which is located in the fuel tank. Fuel is forced through the fuel filter element and then enters the Fuel Pump/Gear Pump, which is attached to the rear of the fuel njection pump. The Fuel Pump/Gear Pump is a low-pressure pump and produce pressures ranging from 551.5 kpa (80 psi) to 1241 kpa (180) psi. Fuel then enters the fuel injection pump. Low pressure fuel is then supplied to the FCA (Fuel Control Actuator).

The FCA is an electronically controlled solenoid valve. The ECM controls the amount of fuel that enters the highpressure
pumping chambers by opening and closing the FCA based on a demanded fuel pressure. The FPS (Fuel Pressure Sensor) on the fuel rail provides the actual fuel pressure. When the actuator is opened, the maximum amount of fuel is being supplied to the fuel injection pump. Any fuel that does not enter the injection pump is directed to the cascade overflow valve. The cascade overflow valve regulates how much excess fuel is used for lubrication of the pump and how much is returned to the tank through the drain manifold.
Fuel entering the injection pump is pressurized to between 300-1600 bar (4351-23206 psi) by three radial pumping chambers. The pressurized fuel is then supplied to the fuel rail.