quick-fuel carb problem on a 460 - 460 Ford Forum
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post #1 of 7 (permalink) Old 02-17-2019, 06:58 AM Thread Starter
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quick-fuel carb problem on a 460

new guy here, building a '53 F-100 with a 460 and got carb problems

1975 460ci from Lincoln Mark IV
Smog head but thermactor hump removed and exh ports smoothed
Drilled for 7/16 studs and using 1:73 roller tip rockers
Heads decked to flat
Fed Mogal H535P flat top pistons
Comp 252 cam
Comp ration 9:1 calculated
Edelbrock 1726 fuel pump 3/8 line 7-8# fuel pressure read on gauge at carb
Quick fuel hr-780 4 barrel vacumn secondaries
Edelbrock performer intake



On the first start, carb flooding…floats set too high… corrected.......Now have fuel dripping from venturies into throat…Can’t seem to get it stopped. Checked needle and seat and it's all clear and working properly. Float not full of gas. Carb rebuilt for this install by a competent carb shop but engine has been idle for a few years.

Engine runs smooth with quick throttle response, no hesitation



But something is making fuel leak and we can’t find it
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post #2 of 7 (permalink) Old 02-17-2019, 07:29 AM
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John, set your idle mix screws to 1-1/2 turns out to start. Check to see if throttle blades are above transfer slot. If so it will dribble fuel from booster. Verify pv is not blown as well. Good luck cory
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post #3 of 7 (permalink) Old 02-17-2019, 08:19 AM
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X2 on checking power valve and I have seen brand new needle/seat assemblies not work or seal well. May also want to try lowering float levels about 1/2 to 1 full turn on the needle/seat assembly(have fuel barely dribble from site screw hole while bumping the vehicle), pressure is a bit on the high side, 6.5-7 psi is usually "good enough" for a "Holley" type of carb. Make sure air bleeds are clear, could also be a metering gasket issue causing partial blocking of the main body to metering block air bleed passages. Hope this helps.

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post #4 of 7 (permalink) Old 02-17-2019, 08:49 AM
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Quote:
Originally Posted by John Niolon View Post
new guy here, building a '53 F-100 with a 460 and got carb problems

1975 460ci from Lincoln Mark IV
Smog head but thermactor hump removed and exh ports smoothed
Drilled for 7/16 studs and using 1:73 roller tip rockers
Heads decked to flat
Fed Mogal H535P flat top pistons
Comp 252 cam
Comp ration 9:1 calculated
Edelbrock 1726 fuel pump 3/8 line 7-8# fuel pressure read on gauge at carb
Quick fuel hr-780 4 barrel vacumn secondaries
Edelbrock performer intake



On the first start, carb flooding…floats set too high… corrected.......Now have fuel dripping from venturies into throat…Can’t seem to get it stopped. Checked needle and seat and it's all clear and working properly. Float not full of gas. Carb rebuilt for this install by a competent carb shop but engine has been idle for a few years.

Engine runs smooth with quick throttle response, no hesitation



But something is making fuel leak and we can’t find it


If its dripping still then either floats are still too high,or neededls are bad ,and need replaced. whats the fuel presser?

RICH
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post #5 of 7 (permalink) Old 02-17-2019, 01:45 PM Thread Starter
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gauge at carb reads 7-8#s
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post #6 of 7 (permalink) Old 02-17-2019, 03:32 PM
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Cool

Cam specs?
Idle speed?
Initial timing? Total timing? What RPM?



SJ

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post #7 of 7 (permalink) Old 02-17-2019, 03:52 PM Thread Starter
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Quote:
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Cam specs?
Idle speed?
Initial timing? Total timing? What RPM?
SJ
Truck is 1953 F-100 project.. not on road yet. this was the first start on the engine since initial break-in period a few years ago.

1975 460ci from Lincoln Mark IV
Smog head but thermactor hump removed and exh ports smoothed
Drilled for 7/16 studs and using 1:73 roller tip rockers
Heads decked to flat
Fed Mogal H535P flat top pistons

Comp 252 cam
rpm range 800-4800
lobe seperation 110
intake centerline 106
duration 252 In & ex
duration at .050 lift 206 in & ex
valve lift 468 in & ex
lobe lift .272 in & ex

Init timing 10 degrees
Perf Distributor HEI adds at least 15 degrees on acceleration (their spec)
Comp ration 9:1 calculated
Edelbrock 1726 fuel pump 3/8 line 7-8# fuel pressure on gauge at carb
Quick fuel hr-780 4 barrel vacumn secondaries EDIT carb is actually a HR650 with mech secondaries
Edelbrock performer intake

see edit aboved HR650 is true. had a heck of a time finding list #

First start, carb flooding…floats set too high… corrected ...now the top of floats now level with bottom of site glass
Now have fuel dripping from venturies or boosters into throat… (hard to tell)
Can’t seem to get it stopped

Engine runs smooth with quick throttle response, no hesitation

But something is making fuel leak and we can’t find it

Open to any suggestions

john
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Last edited by John Niolon; 02-18-2019 at 09:33 PM.
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