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Username Post: Holley 4 Bbl Leaking out Fuel Bowl Vents        (Topic#173824)
Gray Headed Mule 
Valued Contributor
Posts: 4732
Gray Headed Mule
Loc: Fort Worth, Texas
Reg: 12-11-03
11-03-07 02:19 PM - Post#1287764    

I was cruising around today and the car started flooding out really bad! I've got a 350 330hp with a 600 cfm Holley Carb on it. Got it home (barely) and popped the hood, BAD smell of gas. Took off the air cleaner and the carb was smoking, not from fire but from gas being dumped into the engine. I tried starting it and the carb was spitting gas out the fuel bowl vents. I looked down inside the carb and gas was dripping out of the drivers side jet. I've got a manual fuel pump, no pressure regulator on the fuel line. Any hints? Float stuck? Would the float being stuck cause this? Too much fuel pressure? But why now? Thoughts?????
Mule

I'm sexy and I know it!

My 49 Chevy Fleetline Deluxe Restoration Project


 
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fritz1990 
Dedicated Enthusiast
Posts: 6425
fritz1990
Age: 53
Loc: Kansas
Reg: 02-16-03
11-03-07 02:44 PM - Post#1287775    
    In response to Gray Headed Mule

If it's coming out the vents you have a needle/seat problem. Either trash or bad float. Pop the bowl off and take a look see. Do you have a fuel filter before the carb and after the fuel pump? Might check/replace it too and see if it is full of crud.

Regards, Jeff
1998 K1500 6.5 Coal burner
1965 C10 with 498 BBC AFR Heads
1964 C10 Ran 348W for 6 years, now SBC.

Corvettes owned: '74 '77 '78 L82 Silver Anniversary, 2002 LS1

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Edited by fritz1990 on 11-03-07 02:44 PM. Reason for edit: No reason given.

 
beejay 
Ultra Senior Member
Posts: 12605
beejay
Age: 78
Loc: Pflugerville, Texas
Reg: 06-01-04
11-03-07 03:37 PM - Post#1287803    
    In response to Gray Headed Mule

Wayne,

I don't know if this has ever been discussed on your setup or not. AND, I really didn't pay attention to the fuel line setup. Do you have a filter BEFORE the fuel pump? Or, do you have one AFTER the fuel pump. Personally, I prefer the "before fuel pump" situation. You've evidentally got some "trash" being pumped to the carb. This CAN skru upo the float mechanism, and hold the float down which will flud the engine. The rest of the stuff was good when you left after lunch on the 21st, so I really believe that's the problem. And, ya be skruin' up MY kar!!
Bruce

'56 4-door BelAir, 350, Holley 600, Eddie intake, TKO 600, CPP P/S and A arms, Sierra Gold & Adobe Beige
2010 VW Jetta S/W, 2.5, 5-cyl,6-spd auto.
'87 Elkie, 350 with 700r4 tranny B&M floor shift
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Old_Longboarder 
Ultra Senior Member
Posts: 12661
Old_Longboarder
Age: 65
Loc: Long Beach Ca, near Vet's...
Reg: 03-28-02
11-03-07 03:42 PM - Post#1287808    
    In response to beejay

If it's leaking out of both primary and secondary vents, it's crud in the needles and seats. If it's just leaking out of one or the other, the possiblity exists that there's a hole in a float and it's full of gas.

Hope for the prior scenario.
Home.., is where dog hair sticks to everything but the dog.





 
Limey Tri Chevy 
Valued Contributor
Posts: 3434
Limey Tri Chevy
Age: 49
Loc: Hertfordshire, England U...
Reg: 10-19-05
11-04-07 03:39 AM - Post#1288033    
    In response to Old_Longboarder

Have the car at idle and tap the bowl gently with a pin hammer. This sometimes dislodges the crud temporarily go get you home safely. I always have a large canister type filter before the pump as this helps save the pump from gas station crud and a non restrictive one just before the carb. If your not flowing too much fuel those clear glass filters give you a good idea of whats still in the fuel. I don't ike the sintered bronze filters that holley put in the inlet so remove them as they can block very easily.

Also think about cleaning out your gas tank or draining it. I had a '49 Chevy with almost 1/4" of silt in it. Went like a new car after I cleaned it all out.
'57 Bel Air 4dr wagon
'57 210 2dr. 9.3 @ 155 mph 0-60 in 1.47 seconds
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Rick_L 
Honored Member
Posts: 25867

Loc: Katy, Tx, USA
Reg: 07-06-00
11-04-07 04:30 AM - Post#1288046    
    In response to Limey Tri Chevy

Be careful when you put a filter in the suction line. A filter there needs to be rated for suction use. It would have a 100 micron or up rating - essentially a strainer. Otherwise it will be too big a restriction. Shop carefully for that type filter - most are not suitable. Most filters on the market are meant to be placed in a pressure line.

 
Steves32 
Ultra Senior Member
Posts: 10811

Reg: 12-22-99
11-04-07 06:47 AM - Post#1288130    
    In response to Rick_L

100 micron on suction side- 10-20 micron on pressure side. You need little to no resistance on suction side of any pump- electric or mechanical. Pumps aren't very good pullers & when you add the incorrect filter- your volume falls off the map.


 
Gray Headed Mule 
Valued Contributor
Posts: 4732
Gray Headed Mule
Loc: Fort Worth, Texas
Reg: 12-11-03
11-04-07 12:13 PM - Post#1288349    
    In response to Steves32

Thanks for all the replies guys! I never noticed but I don't even have a filter on my gas line! I bought the engine ready to bolt in place and fire up, never even noticed that it didn't have a filter. Looks like I better insatll one!
Mule

I'm sexy and I know it!

My 49 Chevy Fleetline Deluxe Restoration Project


 
Anonymous 

11-04-07 08:37 PM - Post#1288741    
    In response to Gray Headed Mule

Mule,

There was a pretty good string on this not long ago when Anthony (Awendel) was having a similar problem. You might review that one for some tips.

Good luck,

Jay

 
56BUDDY 
Senior Member
Posts: 804

Loc: Union City, CA
Reg: 12-31-02
11-04-07 09:38 PM - Post#1288782    
    In response to Gray Headed Mule

Mule,
Do you have the Chevy crate HO Deluxe engine? The one that's complete including a 600 Holley, long water pump, HEI dist, etc.,etc.?

If so, I've been having carb (Holley) issues myself. Found out that my float levels were too high. Mine was running rich, fouled a brand new set of plugs and I only have less than 2k miles on the engine! Kept hearing about Power Valves being blown out but, this is a brand new carburetor and I didn't want to panic and start replacing everything! Once I adjusted the float levels correctly the electric choke fell into place and the car has been running real smooth now.

Good Luck to you...by the way, I did add a fuel filter (after the manual pump) before I started the motor.

Mel
Mel




 
Ohio55 
Member
Posts: 128
Ohio55
Age: 49
Loc: Shelby,Ohio
Reg: 10-29-06
11-05-07 12:21 AM - Post#1288808    
    In response to Gray Headed Mule

What year 350 do you have? I had a mid 80's 350, 4 bolt main out of a truck in my Chevelle and I had that same problem. It turned out that the mechanical fuel pump I got from the parts store, that was for my specific year 350, was for a fuel injection engine and the overly high fuel pressure would eventually override the needle & seat on my holley and flood out through the vent tubes.

I put on a fuel regulator and the problem was solved.

I'm sure you could also change to an older year pump.

Good luck with your problem
1955 2dr 210 Sedan Link


 
beejay 
Ultra Senior Member
Posts: 12605
beejay
Age: 78
Loc: Pflugerville, Texas
Reg: 06-01-04
11-05-07 12:44 PM - Post#1289146    
    In response to 56BUDDY

Mel,

Holley fixed the Power Valve situation a few years ago. I have a Holley 600, adjusted the float level after many backfires thru the carb, and did not blow a Power Valve. Runs fine now, after all the adjusting I had to do. It's definitely NOT run-out-of-the-box.
Bruce

'56 4-door BelAir, 350, Holley 600, Eddie intake, TKO 600, CPP P/S and A arms, Sierra Gold & Adobe Beige
2010 VW Jetta S/W, 2.5, 5-cyl,6-spd auto.
'87 Elkie, 350 with 700r4 tranny B&M floor shift
http://www.picturetrail.com/beejay3/"


 
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