Weird problem, not sure what to think

[rocktamer]

So I had something interesting and frustrating happen this weekend. I was up in Grand Lake (in the mountains of CO) this weekend. I had the cabin plugged into my truck last night. I went out to start it about 9am and it started up just fine. I put my tuner on high idle and let it warm up for about 10 minutes.
I pulled out the drive way and started to back down the drive to hook up the snowmobile trailer and my truck started sputtering. I gave it some gas and it sputtered and shook and turned off. I tried to start it and it cranked just fine but seemed like it wasn't getting enough fuel, or any at all. I pulled the fuel bowl cap and saw plenty of fuel but it seemed like the bowl had a slight vacuum. I put the cap on the truck started then sputtered and died. It then would not start and I drained the fuel bowl and cycled the fuel pump a few times and then tried to start the truck, and it just cranked. I came back about half hour and jumped the truck, I figured the batteries might be a little low. I cycled the key a few times and could hear both fuel pumps "working". I started the truck and it died after 30 seconds. I cycled the pumps about 5 more times and started the truck. It idled just fine. I took off the jumpers, the truck ran fine. I had no more problems and drove it around the rest of the day and made it back to Denver (170 miles) just fine.
Anyone have any thoughts on this. Everything pointed to the fuel pump for me, but that seems to not be the issue. I'm not sure where to go from here....

[Justin@DP-Tuner]

CPS is my bet...

[rocktamer]

Crank Position Sensor?
From what I hear once this fails the truck is dead until its replaced...

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[7.3HeavyHauler]

yep I've heard that too

[2000-7.3L]

I sell quite a few of those!!


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[mburman]

could the fuel in tank/lines be gumming up and restricted due to cold weather?

[Justin@DP-Tuner]

Originally Posted by rocktamer

Crank Position Sensor?
From what I hear once this fails the truck is dead until its replaced...

Sent from my Droiddddddd

Originally Posted by 7.3HeavyHauler

yep I've heard that too

Not necessarily. The original one on my 7.3L lasted about 120,000 and when it decided to go my truck started up and ran for 20 seconds then died. I cranked for about 45 seconds and got nothing. I let it sit for 15 minutes and it started up and ran for 10 minutes. It then died and started immediately back up. Got to where I was going and changed it. The problem didn't return until recently at 240,000. This time it would die randomly every few days as soon as I started the truck up when it was cold.

My point is that these sensors have a mind of their own. Some die for good and some are intermittent. At least if it doesn't fix your problem you are not out a ton of money.

[TD444EVER]

Originally Posted by rocktamer

Crank Position Sensor?
From what I hear once this fails the truck is dead until its replaced...

Sent from my Droiddddddd

cam position sensor i believe

[2000-7.3L]

Originally Posted by TD444EVER

cam position sensor i believe

you are correct!

[ProOnThaSnow]

I've had my truck for 160K miles and never had to replace mine.

That being said, I have one in the glove box just in case.