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95.5-2004 Tacomas & 96-2002 4Runners 4th gen pickups and 3rd gen 4Runners

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Old 01-18-2004, 08:29 PM   #1
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raw gas coming out exhaust pipe,long

Hello guys. I have a '90 4runner with the V6. I just got my heads rebuilt with all new valves and put them back on along with new timing belt and water pump. It was running poorly when I discovered it had lost compression in a couple of cylinders...burnt exhaust valves. (That's why I got the heads redone)
I followed the manual EXACTLY through all of this.

I got it all together and timed correctly and it starts and runs. BUT, there is raw gas coming out the exhaust pipe...alot. I put a cup under the pipe to catch some, poured it onto the street and lit in on fire. It's definately raw gas.

-I immediately did a compression check. All were around 150psi(no open intake valves)
-Is this something that fuel injectors could cause? It would have to be more than one to spit out that much unburned fuel right? maybe I ruined the injectors when I had them out and wiped them off when cleaning the intake. Didn't see any dirt in the tips.
-I disconnected the little black connector on the top of the intake near the cold start injector line. Acts the same.
-could someone check my hose connections in the pic below? The book doesn't get specific. I noticed a couple of the lines had fuel and if they are in the wrong order, I was thinking I might be dumping too much in the intake.
Click the image to open in full size.
#1 goes to cowl
#2 (2nd one down) goes to valve thing on passenger inner fender
#3 (3rd one down) goes down firewall
#4 (4th one down)goes to valve thing on passenger inner fender
#5 goes to bottom line of valve connected to pwr steering pump
#6 has a line that goes to top line of valve connected to pwr steering pump

I believe #5 and 6 are the cold start injector switch lines?

Any help is GREATLY appreciated. Too dangerous to drive. I gotta fix it myself.
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Old 01-18-2004, 08:36 PM   #2
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Read the following URL:


This is a Mecedes-Benz site. I wouldn't let that be an issue. Cars are cars.
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Old 01-18-2004, 08:46 PM   #3
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Wow Mike, thanks for posting so quickly. If that IS possible, one or two injectors holding open and dumping fuel, it would make sense since I messed with them.
I would like to get my hoses verified too just in case. Thanks!
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Old 01-18-2004, 09:04 PM   #4
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Or you could mount a sparkplug at the end of your exhaust and have fun with tailgators.
Steve. '93 4Runner V6 Auto 4x4
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Old 01-19-2004, 12:37 AM   #5
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ah man!!! you beat me to it robinhood! i was gonna say mount a spark plug in the tail pipe and make it into an afterburner!
1994 White 4Runner 5 Speed SR5 4X4 ~121,000 Miles

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Old 01-19-2004, 09:34 PM   #6
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Just an update in case anyone ever has this problem...It was the fuel pressure regulator. I kind of thought it was alittle too much fuel for 1 or 2 injectors.
It built too much pressure in the fuel rails and dumped 5 gallons of fuel out of the tailpipe in 10 minutes. After I changed it...$110, ran it for 10 minutes to clear the exhaust sytem of any fuel. Also about half a gallon of fuel ends up in the oilpan(yikes) so make sure you change it immediately.
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Old 01-16-2011, 09:24 PM   #7
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I have exact same problem. Raw gas pouring out the tail pipe!! Just did the intake gasket. Everything seems fine, but it blow raw gas out the tail pipe!!! BIG TIME. I disconned some of the intake hoses and gas poured out of them! It ran a little better, but lots of white smoke poured out of pipe this time and smelled like gas. It did not stop. I finnaly just turned off the engine and cried. Could the fuel pressure regulator have a hose hooked up wrong causing over-pressure? No signal to fuel pressure regulator? Seems unlikely that PR went bad immediately after changing the intake gaskets. I think I have a hose hooked up wrong. Any help will be appreciated. I will change my oil, but sure would like to know what is wrong 1st, otherwise I'll just fill up the pan with gas again.

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Old 01-16-2011, 09:24 PM
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