7.3 idi problem

Brian VT

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Glad you found the culprit.
I'd love to be able to get at the fuel that's in my (full) rear tank. I haven't heard of any available tank selector valves that are worth the time and money to install. And I don't want to give up my spare tire to a single rear tank. ;-(
 

JackAsserson

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Glad you found the culprit.
I'd love to be able to get at the fuel that's in my (full) rear tank. I haven't heard of any available tank selector valves that are worth the time and money to install. And I don't want to give up my spare tire to a single rear tank. ;-(
There’s a guy on YouTube that used some kind of manual valve to swap from tank to tank
 

JackAsserson

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Glad you found the culprit.
I'd love to be able to get at the fuel that's in my (full) rear tank. I haven't heard of any available tank selector valves that are worth the time and money to install. And I don't want to give up my spare tire to a single rear tank. ;-(
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Brian VT

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There's been some similar DIYs posted here. I need to decide if that's the route I want to go or try to fix my OEM valve or take a chance on the available repacements.
 

IDIBRONCO

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Looks like fuel return line is leaking. The blowby is pretty substantial , I’m not sure if that’s common with these?
These engines are designed with large ring gaps which makes for a lot of blow by. Yours doesn't look to be extreme.
bypass that selector switch
You'll be fine that way. I ran mine for over 7 1/2 years with no issues. I recently bypassed my bypass lines while trying to fix a fuel pressure issue. In the spring, I'm going to remove the bed and straighten up the mess that's under there right now. I'll go back to the original bypass that I did in 2016. The only thing that I recommend doing is to be sure that the switch is set on the tank that you're running off of so that your fuel gauge will work. My selector valve is still there and the wire harness is still plugged in.
I'm glad to hear that you got the problem figured out. These fuel issues can be a real bear to figure out. After that, it's smooth sailing in that area.
 

JackAsserson

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T
These engines are designed with large ring gaps which makes for a lot of blow by. Yours doesn't look to be extreme.

You'll be fine that way. I ran mine for over 7 1/2 years with no issues. I recently bypassed my bypass lines while trying to fix a fuel pressure issue. In the spring, I'm going to remove the bed and straighten up the mess that's under there right now. I'll go back to the original bypass that I did in 2016. The only thing that I recommend doing is to be sure that the switch is set on the tank that you're running off of so that your fuel gauge will work. My selector valve is still there and the wire harness is still plugged in.
I'm glad to hear that you got the problem figured out. These fuel issues can be a real bear to figure out. After that, it's smooth sailing in that area.
Thanks for the input. I had left it unplugged. Definitely happy with the one tank, never been a fan of electric valves of any sort. This truck is just going to haul corn few times a year. Definitely needs a set of glow plugs, everything else is in order. To my surprise the heat,ac, radio, and all lights work fine
 

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