HPO system leak...somewhere! - Ford Powerstroke Diesel Forum
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Old 05-30-2011, 06:13 PM
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HPO system leak...somewhere!

I have a 99 F550 the truck starting getting hard to start then it cut off on decel up to a stoplight and wouldnt start back even the next day when cool. I checked fuel pressure and its good, I put the plugs in the HPOP lines and tested the pressure it jumps to 3000 right off the bat, then I hooked up the Passenger side head and left the plug and ICP in the driverside line and cranked it over and it jumped to 2500psi and would almost start on the passenger side only, but once the driverside is hooked up it shows no pressure and won't start. So I thought maybe the oil line was collapsed on itself and maybe the oil drain plugs fell out under the drivers valvecover, so I took the drivers valvecover off and the plugs are in and I turned the engine over while I held the oil line and it had plenty of flow, then I hooked it back up like it should be and turned the engine over theres no oil coming out of the HPO rail or from around the injectors that I can see if anyone knows where to go from here I would really appreciate it thanks.
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Old 05-30-2011, 07:22 PM
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Wow... No oil at all?

Is there oil in the valley?

Check the lines from the HPOP, and the level in the HPOP res.

In the meantime, heres a

and
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Old 05-31-2011, 02:54 AM
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Thanks man, yeah I checked the oil lines I even checked both of them side by side to see if they flowed the same which they both looked like they did to me so I hooked them both back up like they supposed to be and the hpop reservoir is full, and theres no oil in the valley either I know its getting from the pump to the cyl heads and when the driverside line is blocked off it will almost run but when you hook up the driverside it doesn't do anything.
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Old 05-31-2011, 06:20 AM
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Quote:
Originally Posted by Stuntman Autoworks View Post
Thanks man, yeah I checked the oil lines I even checked both of them side by side to see if they flowed the same which they both looked like they did to me so I hooked them both back up like they supposed to be and the hpop reservoir is full, and theres no oil in the valley either I know its getting from the pump to the cyl heads and when the driverside line is blocked off it will almost run but when you hook up the driverside it doesn't do anything.
Ok, so are you saying the driver's side rail is not getting oil at all, and you confirmed it by pulling an oil plug?

Or it's not firing on the driver's side?

Because if it's not firing on the driver's side, I would put money down saying it's your UCVH. If it's physically not getting oil....I aint got a clue.
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Old 06-01-2011, 04:46 PM
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Originally Posted by ToMang07 View Post
Ok, so are you saying the driver's side rail is not getting oil at all, and you confirmed it by pulling an oil plug?

Or it's not firing on the driver's side?

Because if it's not firing on the driver's side, I would put money down saying it's your UCVH. If it's physically not getting oil....I aint got a clue.
The plugs I'm talking about are ones that plug into the oil lines so you can test the hpop pressure.

Whats UCVH?

Its getting oil but loosing the pressure somewhere in the driverside head
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Old 06-01-2011, 05:06 PM
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Pull the fuel bowl cap, see if the fuel is black-sounds like a blown o-ring leaking the oil pressure into the fuel system. Pull the injectors on that side, check for bad o-rings. If you already have the valve cover off, its a short path to the injectors. Make sure to remove the glowplugs after you replace the injectors and crank it to get the oil out of the cylinders so you don't hydrolock.
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Old 06-02-2011, 02:29 AM
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Quote:
Originally Posted by dazdillenger View Post
Pull the fuel bowl cap, see if the fuel is black-sounds like a blown o-ring leaking the oil pressure into the fuel system. Pull the injectors on that side, check for bad o-rings. If you already have the valve cover off, its a short path to the injectors. Make sure to remove the glowplugs after you replace the injectors and crank it to get the oil out of the cylinders so you don't hydrolock.
Thanks I already checked the fuel bowl theres no oil in it, but i'm going to pull the injectors today and see what the o-rings look like.
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