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Engine started sputtering and misfiring earlier while driving, and I got a sudden whiff of gasoline, so I pulled over and shut the engine off to look for a fuel leak. Traced all pressure and return lines - all dry and clean. No leaks at injectors, rail, etc. With the engine not running, I turned the fuel pump back on to make sure fuel was flowing and pump pumping - all working as they should be, and no evidence of a leak. Looking at the intake I could hear a gurgling sound that almost sounded like it was coming from inside the intake. Shut the fuel pump off, and pulled the intake hose off between throttle body and AFM - fuel came running out of the throttle body and had to dump it out of the intake hose - probably 4 or 5 shot glasses full.

First thought was cold start injector spraying fuel when it shouldn’t be, getting fuel everywhere in the intake. Decided to start it back up and listen to it run - luckily I just gave the key a bump instead of holding it in the start position - engine rotated for a half second, then STOPPED abruptly...

At that point I realized that the cylinder(s) were probably full of fuel and the intake also was probably full of fuel to the point it was coming out of the throttle body (that’s quite a bit of fuel:eek: ).

Pulled plugs and cranked the engine with fuel pump off, and fuel was blowing out everywhere. Reinstalled plugs and wires, pulled the cold start injector from the plenum and had someone fire up the fuel pump - nothing coming out. Had them start the engine and nothing coming out still, with engine running (cold start was unplugged at first, but then plugged it back in - nothing).

Engine wasn’t quite cold when we did that test, but wasn’t cold when it started sputtering and having issues either. Other than cold start injector issues, the only other scenario I can think of is either somehow fuel going through the pressure regulator and through the vacuum line into the intake (although I pulled that vacuum line on both ends and it’s clean and dry - no evidence of fuel), OR an intake valve hanging open and blowing air/fuel back into intake? I can’t think of any other Way fuel would be getting into my intake...

Anyone else had fuel in their intake like that? I didn’t have any tools on me, and had to wait 2 1/2 hours for a tow back home. Messed with it to the extent above for a while then came into work to try and salvage part of the day. In the meantime, I couldnt find anything in any searches so I thought I’d post it here and see if anyone else has had that issue...

In retrospect it’s felt like it had a little less power the past few days, but so subtle that it may or may not be in my head. Before that it seemed to run great, and just passed smog a few weeks ago, and no starting issues. Trying to picture how long a stuck valve would allow the intake to fill up with fuel. Can’t think of any other way fuel could be getting in there though... Thoughts?
 

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shit in the fuel system that clogged an injector open?

that sounds like too much fuel to be anything other than a vacuum/return line mixeup. a stuck intake wouldn't blow that much fuel back with being rather obvious
 

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shit in the fuel system that clogged an injector open?

that sounds like too much fuel to be anything other than a vacuum/return line mixeup. a stuck intake wouldn't blow that much fuel back with being rather obvious
That’s what I’d think, but I haven’t changed anything with vacuum or fuel lines since I passed smog, and it’s been running fine since then. I was driving the truck daily for the past week or so, and was driving today for about 25 minutes or more before it started running rough.

If a fuel injector was stuck wide open to just pour fuel into a cylinder, there’s still no way it could make its way into the intake without a valve issue, so:confused:
Also, after pulling all spark plugs, there was fuel coming out of all cylinders (although maybe more out of the back two?) so I’d think the intake is filling up and flooding the cylinders that way, as opposed to from the fuel rail.

The 25 minutes of driving before that seemed fine, other than a slight power loss, which may or may not have actually been happening...
 

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combination of a stuck injector and a leaky valve? :laughing:

it almost certainly is a vac line, maybe it just took 25 minutes to get fucked enough to kill it.

did the smog guy fuck with it?
 

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Discussion Starter #5
I’ve put a good 800 miles or more on it since the smog check - been driving it quite a bit. I don’t think think the smog guy fucked with anything... I think god just hates me:homer: This past two weeks has been shitty...
 
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