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Check and Bleed Fuel Pressure

4:45
21:40
684.4K views

At 4:45 in

JH Diesel Flipped His MegaTruck Into Cleetus' Pond...Now We See If It Runs! (6.0 Powerstroke)

What happens here

After confirming the starter is mechanically sound, the focus shifts to the fuel system. A fuel pressure gauge is checked to ensure adequate pressure. The reading is initially below 20 PSI, which is insufficient for a diesel engine to start reliably (a healthy 6.0L diesel typically needs around 60 PSI). To address this, the mechanic uses a wrench to loosen a fuel line fitting near the engine, allowing air and any potential water to bleed out of the system while the ignition is cycled. This process is repeated until the fuel pressure gauge consistently shows pressure above 60 PSI, indicating the fuel system is primed and free of air locks.

Goal: Ensure the fuel system has adequate pressure and is free of air and water.

Tools and materials

  • Fuel Pressure Gauge — Monitoring fuel system pressure
  • Wrench — Loosening fuel line fittings

What they say

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suck it cole can you see this gauge right here oh i'll get up on the tire can you climb in the truck and do me a favor and turn the key on make sure we got fuel pressure fuel pressures should be reading zero right now right yeah i was not sure what the procedure was for getting up here there was like a a way to do it the key is um should be it'll feel kind of firm but turn it back and then just before you turn one click back and then pressure came up a little what did it get to should be about 60. it's less than 20. less than 20. when he just did that it just bumped up yeah it's still less than 20 though kick it on again what's that 20 still still between 0 and 20. yeah the pressure actually went up how's it going yeah it almost touched 40 on again yep now it went past 60. all right kill it i'm no expert here but it looks like you know what you're doing every once in a while take that key on it's a crusher app and past 60 past 60 now yeah that's weird i don't know i mean little broke trans and the uh in neutral down there he's got it so if it gets a signal from the trains it should start does the key have to be on from that like in the crank position uh yes power got my obd2 scanner lit up see what happens we're connected fuel pressure sold in 60 pounds right now yeah yep it's probably closer to 70. it's 60 like the minimum that it needs to start or something um you know these will run off of 30 40 pounds like not good it's not supposed to but they'll still run off i've had around 20 pounds it's just spec is around 60 or so depending how much fuel you're throwing at it for injectors and stuff typically you don't have to do what i just did it was air airlocked it's not something you typically have to do the fuel system was airlocked yeah but this thing was completely empty dry had a lot of water and stuff in it so censorship a lot of stuff stuff he knows the deal oh man it's got a lot

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