Found gas inside air cleaner's base and on filter element??? - Team Camaro Tech
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post #1 of 18 (permalink) Old Feb 19th, 11, 03:13 PM Thread Starter
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Exclamation Found gas inside air cleaner's base and on filter element???

I got some new issue going. Car was running fine all day today. On the way home from gym it died on me but started up later on. It did that twice. It would happen after minor accelerations. No sure if if something is flooding it or starving it but I am leaning towards flooding. When I pulled the air cleaner off, I found a substantial amount of gas inside the base of the air cleaner. The filter bottom part of the filter was soaked in gas as well. Almost like the carburetor threw up? What could be going on here? The setup is a holley 850 double pumper with a 1 1/2" drop base and 3" filter element.

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post #2 of 18 (permalink) Old Feb 19th, 11, 03:58 PM
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Re: Found gas inside air cleaner's base and on filter element???

Sounds like dirt in the primary side needle and seat causing fuel to overflow the fuel bowl...

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post #3 of 18 (permalink) Old Feb 19th, 11, 04:01 PM
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Re: Found gas inside air cleaner's base and on filter element???

Fuel squirting out vents ?

Dirt in needle/seat
Fuel pressure too high (electric pump)
Fuel level too high

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post #4 of 18 (permalink) Old Feb 19th, 11, 04:08 PM
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Re: Found gas inside air cleaner's base and on filter element???

Yep something going on where the float can't shut it down all the way. It spurts out of the vent tube. Can be pretty dangerous.

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post #5 of 18 (permalink) Old Feb 19th, 11, 04:20 PM Thread Starter
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Re: Found gas inside air cleaner's base and on filter element???

I pulled the side plugs on the carb at idle to see if fuel was being dumped but they looked good. I wonder if I have some dirt floating in there that causes this at times. I guess I need to go to a finer filter as fuel is dirty around here. I got 20 Micron now

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post #6 of 18 (permalink) Old Feb 19th, 11, 05:13 PM
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Re: Found gas inside air cleaner's base and on filter element???

Replace your needle and seats. A 20 micron should be fine. Thought it was a 40?
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post #7 of 18 (permalink) Old Feb 19th, 11, 06:21 PM Thread Starter
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Re: Found gas inside air cleaner's base and on filter element???

You are correct...TrickFlow 40 micron

Matt

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post #8 of 18 (permalink) Old Feb 19th, 11, 09:24 PM Thread Starter
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Re: Found gas inside air cleaner's base and on filter element???

Been doing some research... One other cause could be too much fuel pressure. I have a pressure gauge on the fuel line but those things are useless. I can turn it left/right and make the pressure go up/down by 3lbs. I have a pressure regulator and will back of a bit tomorrow. What should the fuel pressure be on a holley 850 setup? 6.0-6.5?

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post #9 of 18 (permalink) Old Feb 19th, 11, 11:58 PM
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Re: Found gas inside air cleaner's base and on filter element???

I was assuming you had set your fuel pressure accurately. Buy a NON liquid filled gauge and no more than 7 psi.
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post #10 of 18 (permalink) Old Feb 20th, 11, 02:29 PM Thread Starter
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Re: Found gas inside air cleaner's base and on filter element???

OK, took needle/seat out and cleaned it really good with carb cleaner. Also backed off a bit on the pressure regulator but the worthless gauge reads the same (this is NON liquid filled gauge). Also finally wired in the Air/Fuel ratio gauge so I can fine tune but first need to brush up on what the proper settings should be.

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post #11 of 18 (permalink) Old Feb 20th, 11, 04:26 PM
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Re: Found gas inside air cleaner's base and on filter element???

Matt sounds like your on the right track (fuel pressure or float level to high). Also when setting the A/F o2 sensor make sure you calibrate it with clean air first before you install it in the bung... At idle 14.5 and WOT 13

I NEED TO HIT THE LOTTERY
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post #12 of 18 (permalink) Old Feb 21st, 11, 08:22 AM
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Re: Found gas inside air cleaner's base and on filter element???

I went through all the same things you are with my engine ,even munched the tranny a bit.
Extending the vents might help a bit. I found the 850 a bit of a dog on the street with this engine. I tried a few carbs and after way to much work got a 950hp to work the best on the street. A custom carb might save you some pain although I didn't have much luck with that either.
WARNING... an A/F guage can drive you insane. A handy tool yes,but it drove me to efi!
Enjoy the process. I learned a lot .

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post #13 of 18 (permalink) Old Feb 21st, 11, 12:42 PM Thread Starter
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Re: Found gas inside air cleaner's base and on filter element???

Quote:
Originally Posted by Skeeter55 View Post
Matt sounds like your on the right track (fuel pressure or float level to high). Also when setting the A/F o2 sensor make sure you calibrate it with clean air first before you install it in the bung... At idle 14.5 and WOT 13
Correct, I calibrated it out in the open first. So after driving around for a bit and starting at my A/F gauge (addictive little thing as I consistently keep looking at it) to no surprise I am running a bit rich. Under light load (30-40mph) just keeping the car going the A/F is at upper 11's mid 12's which could explain my 6 mpg. Idle (in gear) I am good as I'm right upper 13's to mid 14's. I haven't done a good WOT yet... So having said that, I think I need to jet down 1 size on the primaries - would you guys agree?

Matt

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post #14 of 18 (permalink) Old Feb 21st, 11, 04:40 PM
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Re: Found gas inside air cleaner's base and on filter element???

Turning your idle screws in a whisker may help with the light load afr. Your idle quality and vacuum gauge will tell you when you have gone to far. I found jetting has little effect on light cruise.Jet for best afr at wot. I am by no means a carb guru ,just giving my personal experience with a similar engine.

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post #15 of 18 (permalink) Old Feb 21st, 11, 06:04 PM
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Re: Found gas inside air cleaner's base and on filter element???

Mark have you checked and smelled your oil dip-stick to see if it smell like gas, also slide some between your fingers to see if the oil separates like fish eye paint.

How is your ignition all set from initial to cruise to WOT?

What jets and power valve are you running?

Are you in the transfer slots at idle?

What vacuum are you pulling at idle?

Have you adjusted your fuel pressure?

I NEED TO HIT THE LOTTERY
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