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I forgot the letter in front of the code... U1401. I replaced the crankshaft position sensor (ESS) but no dice! Truck still won't start. Had to tow it to repair shop.

A part of me agrees I should order an overflow valve and install it on the return side of the pump... and another part of me thinks I should leave it as it came from the factory? At least I'm pretty sure it came from the factory like this.... I don't recall anyone ever messing with any part of...

We have an 07 3500 that shut down while driving this morning and won't start back up. I scanned the computer and came up with a code 1401 "implausible engine speed signal received". Google search turns up virtually no info? Anyone have any ideas?

So here it is disassembled. No sprimg or check ball. Just what you see here. I'm thinking bleeder valve maybe?

Yea, that's my plan for the moment... when I get a minute I'm gonna remove it and disassemble and figure out exactly what it is and how it works. For the record, last weekend when I went to install the fuel gauge, I removed the outer hex bolt piece thinking it was just a standard banjo bolt and...

Found the other one... I guess I'm sort of answering my own question... I guess I should just order a new valve and install it at the return line. Just can't figure out why it would have come from the factory this way, or why it has never been a problem if it is wrong? Ram Diesel Injector Pump...

Below is some info from Geno's... read the next to the last "note". This makes me think they have seen this before? I'm pretty sure I came across similar info from another source also.... although they have been repeating what they read from this same TSB? I'm gonna try and find it now. TSB...

Runs good! Starts quick! Yea, I don't get it either? I'm quite sure nobody has ever had reason to mess with these connections on this truck. My company has owned it since new, and I don't recall any work ever being done on that portion of the fuel system where someone would have had reason to...

Looks like I finally figured out how to post a pic! Here is the pic of the fuel supply line connection of pump (side facing fender).

Here is the pic of the retun line on pump (engine side of pump)

No, that is where the return line banjo fitting is with a standard banjo bolt.... my overflow valve is on the side of the pump facing the fender where the fuel supply line banjo fitting attaches to the pump.... the short steel line from the filter outlet to the P7100. I have pictures of both if...

I know what it looks like from all of the pics available on the internet. I'm wondering why mine is located on the fuel inlet side of the pump and it seems that every one pictured on the internet is located at the fuel outlet? When I replace it, should I leave it where I found it or move it to...

Why does it look like my overflow valve is located at the supply side of the P7100 and not the return line? My return line has what looks like a typical banjo bolt, and my supply line at the pump has what looks like the overflow valve??? I just installed a guage to read fuel pressure and have...

My '07 has 160K miles and the emissions stuff has never been touched yet! Is my truck the exception to the rule??? (knockin on wood now!)