carb flooding....
#1
Member
Thread Starter
Join Date: Nov 2002
Location: Oradell, bergen county, new jersey
Posts: 222
Likes: 0
Received 0 Likes
on
0 Posts
Car: 88 Camaro Coupe - 99 Corvette
Engine: 305TPI - LS1
Transmission: A4 - A4
Axle/Gears: 3:73 - 3:15
carb flooding....
for a little history... my 88 camaro was originally a TBI car, that was swapped for a TPI, and now its going carb'd
when i did the TPI swap i swapped in the bigger TPI fuel pump and now i have the mallaroy 3 port regulator to use with the carb and it actually works good.
on the instructions for the 3 port regulator it says the return line should be equal to or larger then the intake line, my factory return line is one size smaller! if i pinch the fuel line going to the carb and release fuel as needed it wont flood, but if i leave it alone it will flood.
this leads me to believe that the return line isnt big enough and its backing up into the carb inlet line. this happens even with the regulator turned down to 2PSI.
now ive come up with 2 possible solutions
- climb underneath by the tank and swap the inlet and return lines by the tank and again up by the regulator, this way the inlet is the smaller line and the return is the larger line. i just hope that it doesnt hurt the pump
- get a lower PSI pump that is for a TBI motor and swap it in.... obviously more work tho...
please help im stuck here!
when i did the TPI swap i swapped in the bigger TPI fuel pump and now i have the mallaroy 3 port regulator to use with the carb and it actually works good.
on the instructions for the 3 port regulator it says the return line should be equal to or larger then the intake line, my factory return line is one size smaller! if i pinch the fuel line going to the carb and release fuel as needed it wont flood, but if i leave it alone it will flood.
this leads me to believe that the return line isnt big enough and its backing up into the carb inlet line. this happens even with the regulator turned down to 2PSI.
now ive come up with 2 possible solutions
- climb underneath by the tank and swap the inlet and return lines by the tank and again up by the regulator, this way the inlet is the smaller line and the return is the larger line. i just hope that it doesnt hurt the pump
- get a lower PSI pump that is for a TBI motor and swap it in.... obviously more work tho...
please help im stuck here!
#3
Member
Thread Starter
Join Date: Nov 2002
Location: Oradell, bergen county, new jersey
Posts: 222
Likes: 0
Received 0 Likes
on
0 Posts
Car: 88 Camaro Coupe - 99 Corvette
Engine: 305TPI - LS1
Transmission: A4 - A4
Axle/Gears: 3:73 - 3:15
Re: carb flooding....
i have a mallory 4309
http://store.summitracing.com/partde...5&autoview=sku
ive tried it set at everywhere from 2-5 psi
http://store.summitracing.com/partde...5&autoview=sku
ive tried it set at everywhere from 2-5 psi
#4
Moderator
iTrader: (14)
Join Date: Mar 2000
Location: Littleton, CO USA
Posts: 43,169
Likes: 0
Received 36 Likes
on
34 Posts
Car: 82 Berlinetta/57 Bel Air
Engine: LS1/LQ4
Transmission: 4L60E/4L80E
Axle/Gears: 12B-3.73/9"-3.89
The stock return line is fine. The pump isn't going to overwhelm a 5/16" line (as long as it isn't restricted, as in bent or smashed or plugged).
Where is your pressure gage located?
Where is your pressure gage located?
#5
Member
Thread Starter
Join Date: Nov 2002
Location: Oradell, bergen county, new jersey
Posts: 222
Likes: 0
Received 0 Likes
on
0 Posts
Car: 88 Camaro Coupe - 99 Corvette
Engine: 305TPI - LS1
Transmission: A4 - A4
Axle/Gears: 3:73 - 3:15
Re: carb flooding....
ahh ok awesome ill try switching the lines when i get home from vacation then!
the guage is just after the regulator... followed by a filter, then the carb
the guage is just after the regulator... followed by a filter, then the carb
#6
Moderator
iTrader: (14)
Join Date: Mar 2000
Location: Littleton, CO USA
Posts: 43,169
Likes: 0
Received 36 Likes
on
34 Posts
Car: 82 Berlinetta/57 Bel Air
Engine: LS1/LQ4
Transmission: 4L60E/4L80E
Axle/Gears: 12B-3.73/9"-3.89
What carb did you put on?
If it floods regardless of pressure setting, it isn't the pressure that's causing the flooding. Most likely you've got a small leak in the float needle/seat.
If it floods regardless of pressure setting, it isn't the pressure that's causing the flooding. Most likely you've got a small leak in the float needle/seat.
#7
Member
Thread Starter
Join Date: Nov 2002
Location: Oradell, bergen county, new jersey
Posts: 222
Likes: 0
Received 0 Likes
on
0 Posts
Car: 88 Camaro Coupe - 99 Corvette
Engine: 305TPI - LS1
Transmission: A4 - A4
Axle/Gears: 3:73 - 3:15
Re: carb flooding....
an eldelbrock 1406 650cfm electric choke, nothing extreme
Trending Topics
#8
Re: carb flooding....
Hey dude, I just had the same problem with my car. five7Kid is on the right track, he metioned it might be a whole in the float....my problem was, I put a new carb, fuel pump (electrical external). My carb kept flooding also so I added a fuel pressure regulator....still flooded so I took the electical pump off and put the mechanical pump back on with out the pressure regulator...still flooded....next thing I did was take the top end of my carb (edelbrock 600) off and examine it....guess what? my needle valve to my float was stuck open, there was a little debris/dirt or contaminants from old fuel keeping it from going down and plugging the hole. In other words the floats on a carb work the same as the float in your toilet bowl tank, once the bowl is full the float rises and cuts off the water supply to the tank. In the carb the float rises which seats the needle valve (blocks hole) to cut off fuel to the carb-when the carb requires more fuel the float drops. This lifts the needle valve (opening the hole) to supply more fuel to the carb. So it seems your problem is fuel is not shutting off, no matter how much fuel pressure there is the floats will only let the float bowls take so much, if the needle valves aren't seating it will FLOOD!!!. Next step is to go to your neighborhood auto parts store and buy you some Berrymans Parts/Carb cleaner and soak your carb and rebuild it. Elelbrocks are a hell of a lot easier than a Holley to rebuild. Anyway I rebuilt my carb, installed it and it cranked right up, flooding problem taken care of. Hope this helps, Later
#9
Member
Thread Starter
Join Date: Nov 2002
Location: Oradell, bergen county, new jersey
Posts: 222
Likes: 0
Received 0 Likes
on
0 Posts
Car: 88 Camaro Coupe - 99 Corvette
Engine: 305TPI - LS1
Transmission: A4 - A4
Axle/Gears: 3:73 - 3:15
Re: carb flooding....
well that sure makes lotsof sense... ill have to take a look when i get home
#10
Member
Thread Starter
Join Date: Nov 2002
Location: Oradell, bergen county, new jersey
Posts: 222
Likes: 0
Received 0 Likes
on
0 Posts
Car: 88 Camaro Coupe - 99 Corvette
Engine: 305TPI - LS1
Transmission: A4 - A4
Axle/Gears: 3:73 - 3:15
Re: carb flooding....
well i just checked... played with the float settings, nothing changed, pulled the top of the carb off... one float fulllll of gas. i guess thatd casue it not to "float" and shut down the fuel!
guess ill be ordering new floats...yay
guess ill be ordering new floats...yay
#11
Member
Thread Starter
Join Date: Nov 2002
Location: Oradell, bergen county, new jersey
Posts: 222
Likes: 0
Received 0 Likes
on
0 Posts
Car: 88 Camaro Coupe - 99 Corvette
Engine: 305TPI - LS1
Transmission: A4 - A4
Axle/Gears: 3:73 - 3:15
Re: carb flooding....
that problem has been solved! thansk guys
Thread
Thread Starter
Forum
Replies
Last Post
RedLeader289
Tech / General Engine
10
05-28-2019 01:47 PM
efiguy
Engine/Drivetrain/Suspension Parts for Sale
0
09-27-2015 01:30 PM