Had a bad day today. Pulling the boat home from the river today i stopped for dinner and on the way out I started smelling fuel so decided to pull over. Before I could pull over, the engine started running really strange so I turned the key off and put it in nuetral(6-speed), but she kept running. Reved to sky and was blowing white smoke out the stacks for about 10 seconds until slowly dieing off. Opened the hood and there is fuel dripping everywhere on the driver side of the truck. Pushed the truck onto a dirt road so I could take a look because there was no fuel coming out anywhere just dripping all over. I turned the key and fuel started shooting out of the top of the fuel pump right between the lid and resiviour. I took that off and reset the seal which fixed the fuel problem. Turned the truck over and there is brutal knock coming from the engine. Wondering what happened to the truck. Obviously from when it reved to the sky but what aucually happend? Bad injector? Also, what would cuase the fuel to just come out of the fuel pump. I had a dp tuner which stopped working so I mailed it back this week. Could that have messed up my pcm and telling the fuel pump to just keep pumping? Any suggestions on what happend or how to fix the knock would be great.

 

you got some air in the line and it will sound bad give it some miles and it should go away. are you related to the hulk to push the truck to a dirt road? i cant move mine. lol

 

Sounds to me like it ingested fuel through the intake and ran away on you for a minute.

I suspect a knock in a engine after an overrev isn't going to be an easy fix. Might be a rod. I wouldn't run it much until you get it diagnosed, you might accidentally install the latest version of windows.

 

What kind of air intake do you have?

Sounds like a run away, but it sure did taper off quick for one. Also, this isn't something we hear much about. A stock intake or AIS would be enclosed and should prevent it. A CAI should also prevent it, so maybe a 6637? (not that you like to bash those or anything). I've got the homemade cold air box around my 6637 and when my fuel crossover came apart all I did was dump a whole lot of fuel everywhere. I lost a 1/4 tank of fuel while driving and had someone shout to me that I had blown a radiator hose before I pulled over. I also threw my 6 speed into neutral but left the engine on. No run away for me.

I'm not saying it didn't run away. Just trying to figure out how the fuel got into the intake to do it. Perfect shot from the fuel lid to an open air intake?

 

right on, 6637 with a riff raft cover. Might have been closer to 30 seconds. and yes, when i watched the fuel shooting out of the fuel resiviour it was shooting right at the intake. Do you think the knock is a bad injector or maybe even not enough fuel getting there yet.

 

Shouldn't be possible for our engine to rev with the key off. I can't think of any other way for it to continue running.

 

I fear you've damaged a connecting rod. Again, I wouldn't reccomend you run the engine. You need to find someone with an AE right away.

 

how long have you run it and dose it still knock.

 

Running the injectors low on fuel can cause a knock that sounds like someone slamming your engine block with a ball peen hammer. Of course damaged engine internals can sound the same way.

There's always nitrous or meth. It shouldn't over rev with the key on at idle either, but I don't recall reading or hearing about a run away on a 7.3 without drugs.

Over rev will usually bend a push rod first, right? That wouldn't explain the knock, but running out of fuel would. I was able to cruise at 55 mph with an open crossover and no knocking from low fuel so mechanical issues are a real possibility. So what's the next step? Rotate the crank by hand to check how things feel? If the rod is bent, how much damage was done to the cylinder wall?

I still don't see how spraying diesel on the 6637 would cause a run away since we'd only be dealing with fumes.

To garsm. When you say revved to the sky, exactly how many RPM's are we talking about? Over 3,000 rpm's?

 

Maybe we can test whether the 6637 passes fuel on a running engine, but I'll not volunteer my engine to be the test unit, I don't have any 6637 filters. Maybe yours? I'll pay for a gallon of diesel.

Box of beer on there being liquid diesel in the bottom of the intercooler.

 

i dont see how the fuel could make it thought the filter the paper would soak a lot of the fuel up before it could get to the motor then the heat form the turbo should burn it before it gets there, or it got caught in the IC. and with the key off the pump is not running so no psi.

 

The exact reason it didn't rev until the engine blew up, when he turned the key off he cut off the fuel supply.

 

I'm suspecting a starvation of fuel knock possibly, they are loud but that over reving remark sounds scary.

 

but how did the fuel get though all for the the intake to the motor. would the ic not be a "filter" to let it drop out before it made it to the motor. i just wont to know if i should put a cover over my 6637 filter or is this a 1 in a million.

 

If that were the case, everyone running a stock CCV would have a intercooler full of crankcase oil.