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#1 |
Registered User
Join Date: Jun 2002
Location: Fort Worth, TX
Posts: 920
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Fuel percolating....I need help!
Situation is this I just put a 305 in my 72 with as edelbrock 1406. Idles great and runs great until it gets warm then dies.. drove down street and back died in the drive. Could hear the fuel percolating in the carb.... how,can I fix this?
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#2 |
Senior Member
![]() Join Date: Dec 2013
Location: Gods country East,Tn
Posts: 8,545
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Re: Fuel percolating....I need help!
isolate the carb with a phenolic thermal insulating spacer .What intake are you using ? how is the fuel line run from the pump to the carb ? Any other changes made recently before this started happening ?
http://shop.advanceautoparts.com/p/m...ntent=22901572
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![]() 1967 Factory short bed - Old school '71 - 350 / 4bolt / 487 heads / Edelbrock C3BX Muncie M-22 4 speed / Hurst Comp plus Factory 12 bolt posi 3.73 / 255-70-15 Smoothed firewall / Factory cowl induction Power disc brakes / power steering / 3.5-5" drop |
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#3 |
Registered User
Join Date: Jun 2002
Location: Fort Worth, TX
Posts: 920
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Re: Fuel percolating....I need help!
I used the edelbrock adapter. Is that nit the same ?
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#4 |
Registered User
Join Date: Jun 2002
Location: Fort Worth, TX
Posts: 920
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Re: Fuel percolating....I need help!
The motor is bone stock except for carb and headers. Just finished putting it in so its just. Started
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#5 |
Registered User
Join Date: Aug 2006
Location: Redmond, WA
Posts: 6,332
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Re: Fuel percolating....I need help!
Are you sure your timing isn't overly retarded? This can happen on long drives on a hot day with winter gas still in the tank, but shouldn't be something you routinely face on a test drive.
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1970 GMC Sierra Grande Custom Camper - Built, not Bought 1969 Pontiac 2+2 427/390 4-speed Coupe 1969 Pontiac 2+2 427/390 4-speed Convertible |
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#6 |
Registered User
Join Date: Jun 2002
Location: Fort Worth, TX
Posts: 920
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Re: Fuel percolating....I need help!
Yes timing is good
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#7 |
Registered User
Join Date: Sep 2014
Location: Gloucester Massachusetts
Posts: 72
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Re: Fuel percolating....I need help!
I think these carbs a very prone to heat soak. I run the same carb and after running my truck and then stopping the next start is often hard as the fuel has all boiled out. I plan on putting a phenolic spacer on before I put my truck back on the road this year.
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#8 |
Registered User
Join Date: Feb 2016
Location: indianapolis, in
Posts: 46
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Re: Fuel percolating....I need help!
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#9 |
Registered User
Join Date: Jun 2002
Location: Fort Worth, TX
Posts: 920
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Re: Fuel percolating....I need help!
Is that spacer same thing as the adapter plate? So I can use both?
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#10 |
Registered User
Join Date: Jun 2002
Location: Fort Worth, TX
Posts: 920
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Re: Fuel percolating....I need help!
Anyone?????
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#11 | ||
"I ain't nobody, dork."
Join Date: Sep 2007
Location: Whidbey Island, Washington
Posts: 8,940
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Re: Fuel percolating....I need help!
It's not the same as the adapter. The phenolic spacer will help out. So this engine has the stock spreadbore intake on it?
I know you said your timing is "good"... but what do you have it set at? Gary
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'cuz chicks dig scars... My 1972 GMC 1500 Super Custom (Creeping Death) "long term" build thread. The Rebuild of Creeping Death after the wreck Quote:
Quote:
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#12 |
Registered User
Join Date: Aug 2009
Location: Bowser
Posts: 13,626
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Re: Fuel percolating....I need help!
Sure!
Use a 1/2 inch one. http://www.summitracing.com/int/part...1402/overview/ But You shouldn't be having heat problems this early in the spring. You said your timing was good. What's your initial timing? |
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#13 |
Registered User
Join Date: Jun 2002
Location: Fort Worth, TX
Posts: 920
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Re: Fuel percolating....I need help!
2 degrees if I remember correctly if wrong what as hould it be?
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#14 |
Registered User
Join Date: Aug 2009
Location: Bowser
Posts: 13,626
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Re: Fuel percolating....I need help!
At least 12 initial.
Plug off the vac pot on the distributor when you set it. Slow down your idle after you set it too. |
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#15 |
Registered User
Join Date: Jun 2002
Location: Fort Worth, TX
Posts: 920
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Re: Fuel percolating....I need help!
Gonna dbl check it tomorrow instead of buying that spacer. Thanks for the help
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#16 |
Registered User
Join Date: Aug 2006
Location: Redmond, WA
Posts: 6,332
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Re: Fuel percolating....I need help!
Doesn't sound like timing is "good" to me. Sounds way retarded like I guessed. Bring it up like Geezer says to 10 or 12 BTDC (so long as it doesn't ping when all the mechanical is in).
You have vacuum advance hooked up, right? You don't have a hope without it, unless this is a full race engine set up for it. He says plug it off but he means (if I may be so bold as to assume) when you're setting the initial timing - you hook it back up after.
__________________
1970 GMC Sierra Grande Custom Camper - Built, not Bought 1969 Pontiac 2+2 427/390 4-speed Coupe 1969 Pontiac 2+2 427/390 4-speed Convertible |
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#17 |
Registered User
Join Date: Dec 2014
Location: Rockport, Texas
Posts: 192
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Re: Fuel percolating....I need help!
Edelbrock carbs are bad about heat soak. A plastic, phenolic, or wood spacer is a must if you run one, IMHO. Put one on my Thunderbird & had an identical problem to yours. Installed a plastic spacer- problem solved.
But check your timing, just in case. |
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#18 |
Registered User
Join Date: Apr 2010
Location: Jeffersonville, Indiana
Posts: 136
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Re: Fuel percolating....I need help!
Timing and a plastic spacer should cure it, I had the same carb on my truck prior to the rebuild.
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#19 |
Registered User
Join Date: Jun 2014
Location: Lake Tapps Washington
Posts: 386
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Re: Fuel percolating....I need help!
My buddy's Impala had a edelbroke on it and it would do the same thing when we were running it down the track. We used a two pieces of wood (little scraps) and taped the ends together so that the fuel like was stuck between em. Temp fix but it helped get down the track a couple more times lol.
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1967 Chevy CST 10 1969 Chevy C/20 Longhorn 1969 K10 Suburban 1972 Chevy Cheyenne Super 10 turned K30 (sold) ![]() |
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