Good Morning all. For the past week and a half my fuel pressure has been erratic from 60psi to 100psi. When going WOT the fuel pressure settled down to around 62psi and that lead me to believe bad fuel pressure regulator. So I bought the rebuild kit and did that this weekend.

After the rebuilt fpr, the truck did not want to start. I had drained some of the fuel out of the fuel bowl but didnt believe it was that much. I could hear the fuel pump cycle so pretty sure thats working.

The temperature was around freezing which is warmer than it has been. The fuel pressure gauge rose to 65psi and held while the coil (WTS) light came on, cranked for a few seconds and didn't start. Put a heater on the fuel lines to warm them up, plugged in the engine block heater and still no start.

turned the key on and opened the fuel drain plug on fuel bowl and fuel came shooting out so seemed to be getting fuel. Hooked up a battery charger and let it charge for awhile. Still no start.

Kept trying to start and finally after about 45 minutes the truck fired up, romped for 2-3 seconds then smoothed out. Let the truck run, fuel pressure held nicely. Took a quick ride, no problems. Shut the truck off, waited a couple minutes and it fired right back up. Tried a couple times and each time it fired up.

That was Saturday, yesterday I got busy around the house and did not have a chance to start the truck. It was around 35 degrees out so not too cold. This morning I tried to start the truck and it turns over nicely but no start again.

It was around 18 degrees (truck has started fine on colder days). Now I noticed when keeping the key on the fuel pump cycles on then off, coil light comes on and then off. Fuel pressure holds around 65psi then after everything else is done cycling there is a slight click and fuel pressure drops down to almost nothing. I havent noticed that before.

So a long story for shorter question. Did I do something wrong with the rebuild or does it sound like something else?

 

To me, it sounds like glow plugs not energizing. How long was the block heater plugged in? Was there any smoke while cranking?

 

block heater was plugged in for about 45 minutes... There is white smoke while cranking

 

45 minutes probably wasn't enough to heat it up. The white smoke indicates raw fuel. Start by checking the glow plug relay with a voltmeter. With the key on, you should see voltage on both the large terminals while the relay is energized. You should have about a minute from the time you turn the key before the relay turns off. Check both terminals and make note of any large difference in the voltage between them. If the voltage is good, suspect bad glow plugs.

 

That certainly sounds like a GP Issue. Have you tested the GPR? The GP runs from 2 - 120 seconds depending on ambient air temperature reported by the AIS.

The fuel pump cycling is normal.

Plugging the truck in for less than 4-6 hours is a waste of time regardless what others may say. It has to heat 8 gallons of fluid and then maintain temperature of 8 gallons of fluid.

 

I will get on that and get back after work today

 

Plugged the truck in overnight, poured in some diesel 911 and after 3-4 seconds of cranking it started right up! This was in sub-0 temperature. Thanks all for the help

 

Great to hear. Thanks for following up.