Carb leaking into intake - Team Camaro Tech
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post #1 of 19 (permalink) Old Mar 21st, 10, 11:23 AM Thread Starter
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Rusty
 
Join Date: May 2007
Location: Georgia
Posts: 190
Carb leaking into intake

My 650 Quick Fuel is somehow draining both bowls over a period of a week or less. The fuel goes down into the intake and ends up in my oil. I went to change my power valve yesterday and the front bowl was empty and I couldn't see fuel through the clear sights on the rear bowl. What could cause gas to completely drain from the bowls? The outside of the intake is dry so it's all going into the intake. The power valve has a new gasket and the power valve is new.

1991 Camaro RS, 355 cid, 10.5:1 CR, Scat crank, Speed Pro flat tops, Brodix IK180's. Comp XE268, 1.6 rockers, Perf RPM Air Gap, 650DP Quick Fuel, Hedman long tubes, BTO Level 2 700R4, 3.73 w/ posi.
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post #2 of 19 (permalink) Old Mar 21st, 10, 12:18 PM
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Sean
 
Join Date: Sep 2007
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Garage
Re: Carb leaking into intake

I had a similiar issue with my Quick Fuel 750SS. The first winter I stored it the bowls were completely empty come spring and when I went to fill them, the gaskets must have been dried up alittle cause the gas starting to leak out and puddled up on my intake. With mine though I am thinking the gas is evaporating in the bowls during storage, so this year I just keep adding gas through the vent tubes every few weeks to keep the gaskets wet.

1969 Camaro - LeMans Blue
383ci Stroker ~ M22 4-speed ~ 12-Bolt Posi-3.73
AR Torq Thrust D Wheels:
Front - 15x6 with 215/65
Rear - 15x8 with 255/60
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post #3 of 19 (permalink) Old Mar 21st, 10, 12:51 PM
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Steiner
 
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Location: Lyman, SC
Posts: 8,348
Re: Carb leaking into intake

Possibly the needle valve and/or seat. Had an old 1850 model that needed some work but once I had to knock the fuel bowls off with a hammer I figured it was too far gone to even bother with.

Here's a link to document that may be of some assistance:
http://www.vintagemusclecarparts.com.../needleandseat

'69 Camaro
Dart 400-AFR 195-224/224 HR-Powerjection III TB with F.A.S.T. Sportsman XFI
TKO 600-Moser 3.42-Detroit Truetrac
500hp/538lbft

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'69 Camaro Beater-SFT 327-M20-Moser 4.10-sold
'02 Z/28 vert-stock-sold and totaled
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post #4 of 19 (permalink) Old Mar 21st, 10, 01:14 PM Thread Starter
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Rusty
 
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Re: Carb leaking into intake

Quote:
Originally Posted by SR77 View Post
I had a similiar issue with my Quick Fuel 750SS. The first winter I stored it the bowls were completely empty come spring and when I went to fill them, the gaskets must have been dried up alittle cause the gas starting to leak out and puddled up on my intake. With mine though I am thinking the gas is evaporating in the bowls during storage, so this year I just keep adding gas through the vent tubes every few weeks to keep the gaskets wet.

It's not the bowl or metering block gaskets, it has to be something else, the fuel is draining down into the intake and consequently down into the cylinders. The outside of the intake is dry.

1991 Camaro RS, 355 cid, 10.5:1 CR, Scat crank, Speed Pro flat tops, Brodix IK180's. Comp XE268, 1.6 rockers, Perf RPM Air Gap, 650DP Quick Fuel, Hedman long tubes, BTO Level 2 700R4, 3.73 w/ posi.
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post #5 of 19 (permalink) Old Mar 22nd, 10, 11:31 AM Thread Starter
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Rusty
 
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Location: Georgia
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Re: Carb leaking into intake

I spoke with Quick Fuel and they said it could be the gasket between the metering block and main body, however I really don't see how it could be that.

1991 Camaro RS, 355 cid, 10.5:1 CR, Scat crank, Speed Pro flat tops, Brodix IK180's. Comp XE268, 1.6 rockers, Perf RPM Air Gap, 650DP Quick Fuel, Hedman long tubes, BTO Level 2 700R4, 3.73 w/ posi.
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post #6 of 19 (permalink) Old May 3rd, 10, 11:15 AM Thread Starter
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Rusty
 
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Location: Georgia
Posts: 190
Re: Carb leaking into intake

I replaced the meteriing block gaskets and power valve & plug gaskets and it still leaks. Has anyone ever had issues with a quick fuel having a main body or metering block being warped?

1991 Camaro RS, 355 cid, 10.5:1 CR, Scat crank, Speed Pro flat tops, Brodix IK180's. Comp XE268, 1.6 rockers, Perf RPM Air Gap, 650DP Quick Fuel, Hedman long tubes, BTO Level 2 700R4, 3.73 w/ posi.
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post #7 of 19 (permalink) Old May 3rd, 10, 01:46 PM
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Steps
 
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Re: Carb leaking into intake

Crap in air bleeds which causes the fuel to sypon into the manifold
Very often an old school side of the road 'fix' works
remove air filter, take rpms up, hand over the top till engine almost stalls the pull you hand off, 3 or 4 times.

Failing that dismantle carb and soak/clean/ blow out all galleries.

Note a light smear of oil on gaskets makes them easy to remove later, and reusable for side of the road fixes.

My Spelling is not incorrect...it is creative

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post #8 of 19 (permalink) Old May 3rd, 10, 02:29 PM Thread Starter
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Rusty
 
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Location: Georgia
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Re: Carb leaking into intake

Quote:
Originally Posted by Steptoe View Post
Crap in air bleeds which causes the fuel to sypon into the manifold
Very often an old school side of the road 'fix' works
remove air filter, take rpms up, hand over the top till engine almost stalls the pull you hand off, 3 or 4 times.

Failing that dismantle carb and soak/clean/ blow out all galleries.

Note a light smear of oil on gaskets makes them easy to remove later, and reusable for side of the road fixes.
I can let the car sit a week, turn the fuel pump on to fill the bowls and let it sit for a few days and it will drain down. The air bleeds will cause them to drain even if the engine hasn't been cranked in a couple of weeks??

1991 Camaro RS, 355 cid, 10.5:1 CR, Scat crank, Speed Pro flat tops, Brodix IK180's. Comp XE268, 1.6 rockers, Perf RPM Air Gap, 650DP Quick Fuel, Hedman long tubes, BTO Level 2 700R4, 3.73 w/ posi.
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post #9 of 19 (permalink) Old May 3rd, 10, 02:31 PM
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Lex
 
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Re: Carb leaking into intake

Mines has always leaked a little bit, but i never thought it could go down the manifold and into the oil. How does it end up in the oil ? Mines only leaks a tiny bit, i see it on the manifold.


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68 Camaro / 400 ci / 3.73 10 /
Edelbrock Performer Series 600 cfm no. 14054
Edelbrock Performer EPS Intake Manifold 27014

98 GMC Suburban / 454 V8 / K2500 4x4

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post #10 of 19 (permalink) Old May 3rd, 10, 03:15 PM
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AJ
 
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Re: Carb leaking into intake

Ring gaps are larger when sitting due to no heat expansion.

The only Mustang I'd ever own is a Fender.

'68 333" Camaro
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post #11 of 19 (permalink) Old May 3rd, 10, 11:35 PM
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Steps
 
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Re: Carb leaking into intake

Quote:
The air bleeds will cause them to drain even if the engine hasn't been cranked in a couple of weeks??
Quote:
Crap in air bleeds which causes the fuel to syphon into the manifold
My sons rx7 was doing the same thing...crap in the carbs.
Except that was rather funny
He would turn the car off after a run, jump out, walk 10 yrs or so away, Then KARRBOOOM.
The fuel would explode in the exhaust ....should hear what it sounds like in an underground car park lol

My Spelling is not incorrect...it is creative

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post #12 of 19 (permalink) Old May 3rd, 10, 11:50 PM
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Steiner
 
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Re: Carb leaking into intake

Quote:
Originally Posted by Steptoe View Post
My sons rx7 was doing the same thing...crap in the carbs.
Except that was rather funny
He would turn the car off after a run, jump out, walk 10 yrs or so away, Then KARRBOOOM.
The fuel would explode in the exhaust ....should hear what it sounds like in an underground car park lol

My cousin used to do that with an old full size 390ci Ford Ranger with straight pipes around the local cruise spots. Do a drive-by turning the ignition on and off and watch all the people duck.

'69 Camaro
Dart 400-AFR 195-224/224 HR-Powerjection III TB with F.A.S.T. Sportsman XFI
TKO 600-Moser 3.42-Detroit Truetrac
500hp/538lbft

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'69 Camaro Beater-SFT 327-M20-Moser 4.10-sold
'02 Z/28 vert-stock-sold and totaled
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post #13 of 19 (permalink) Old May 4th, 10, 06:06 AM Thread Starter
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Rusty
 
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Re: Carb leaking into intake

Quote:
Originally Posted by Steptoe View Post
My sons rx7 was doing the same thing...crap in the carbs.
Except that was rather funny
He would turn the car off after a run, jump out, walk 10 yrs or so away, Then KARRBOOOM.
The fuel would explode in the exhaust ....should hear what it sounds like in an underground car park lol
Ok I'll give it a shot. Think an air compressor might work or would it mess something up?

1991 Camaro RS, 355 cid, 10.5:1 CR, Scat crank, Speed Pro flat tops, Brodix IK180's. Comp XE268, 1.6 rockers, Perf RPM Air Gap, 650DP Quick Fuel, Hedman long tubes, BTO Level 2 700R4, 3.73 w/ posi.
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post #14 of 19 (permalink) Old May 4th, 10, 06:52 AM
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Rich
 
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Re: Carb leaking into intake

Step,those rotaries always make popping sounds.We had a few that would show up at the street races back in the day.Old RX 3's with 13B mtors and nitrous.Yiinnnnnggggg Yiinnnnggggggg,POP! brump brump brump Yiinnnnnggggggg Yiinnnnggggg POP!

Yiinnnnngggggggggg POP Yiiinnngggggggggg POP CLANK BANG BOOM{sound of half breed Toyota 5 speed truck trans falling apart on 2-3 shift} Brump brump brump{sound of RX3 coasting to side of road).

I just had to go there
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post #15 of 19 (permalink) Old May 4th, 10, 03:21 PM
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Steps
 
Join Date: Dec 2005
Location: New Zealand
Posts: 13,316
Re: Carb leaking into intake

Quote:
Do a drive-by turning the ignition on and off and watch all the people duck.
Thats boy racer BS sry
Note this is when he has parked the car, turned off the engine, got out of the car and walked away lol

Quote:
sound of half breed Toyota 5 speed
We relate the sound of a rotary to a sewing machine lol
Thu I must say my sons does sound real nice, more like a V8 at high rpms with a deep rumble
Hes done the full resto all himself, from body work to porting over the last 2 1/2 yrs, no help from the old man either....hes only 23 yrs old and not in the trade...a telecomications rigger....sort of job mike rowe would do.
Hes been sensible too, carbed and hasnt over ported it, so it is still quite streetable, the turboed injected fully ported are absolute pigs to drive on the street.

My Spelling is not incorrect...it is creative

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