I installed an Airdog II and Fuellab regulator as written up by various people on this forum. Once finished I set the regulator to 60 psi before cranking. The truck cranked and ran fine, so I shut it off to clean up for a test drive. When I came back it was hard to crank and idled rough. It did smooth out and I drove it a couple of miles to warm it up and set the final pressure. When I got home I left it idling and adjusted the regulator. As I turned the adjustment screw to go for 62 psi, the truck shut off and has not cranked since. I checked and fuel is flowing through the regulator.
Does anyone have any ideas of what I should check or what might be wrong?
Could have an air pocket in there. I don't know how you have it set up, but can you bleed it on the opposite side that it enters the heads then run it down the road for a while to get it all out of there.
The truck is running fine now. I did my praying last night and went outside this morning, pulled off and put back on the connection to the IPR and it fired right up like a new truck. I drove it to town and back with no problems cranking or running.
So, one of three things took place:
1. God worked on that truck all last night.
2. There was air in the system that sitting overnight
cured.
3. The connection to the IPR was not good.
I will buy a new fuel bowl wiring harness when I can find one and install an electric fuel pressure gauge so I can monitor things more closely.
I don't think that the lack of use of the stock wire harness is going to make a difference in the fuel pressure here. I disconnected my stuff and taped it up and never looked back. The only sensors on the fuel bowl are "water in fuel" and and I think the one for the filter is a restriction indicator.
My thought is that if you have a regulated return then you should be able to turn on the pump and let any air go down the return to the fuel tank. I'd let the pump run for a while and see if it changes in sound at all. I noticed that when I have the needle valve closed (deadhead), the pump gets louder. When I have no restriction (restriction=pressure) on the return, the pump gets really quiet. When I set my pump up I let it run and run because it was a new engine, new injectors, new fuel setup. I wanted to give the opportunity for the trapped air to exit and everything to prime real well.
Your injectors are going to determine what fuel pressure you want to run at. My injectors call for 65-70 psi. I would certainly put a fuel pressure sending unit in the T that is in your return line. Then you will be able to see exactly what you are doing for fuel pressure at all speeds, throttle positions, etc.
And it is certainly possible that when you were in the valley maybe a wire connector got knocked loose (IPR) and since we started trouble shooting this thing, I have had in the back of my mind that if you have all of the fuel pressure and flow, there has got to be something else.
OK, now back to my 8 page 2nd Amendment paper. Oh yeah, I started drinking again. I seem to get better grades when I have a couple of beers with my paper.
I'm glad to hear that things are getting sorted out for you Knotwild.
Cheers-
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