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Carter Carb Question AVS #1461257 07/01/13 06:19 PM 07/01/13 06:19 PM
Joined: Jan 2003 Posts: 1,755 Washington Twp., Southern NJ F Fastfrankie OP top fuel
Fastfrankie OP top fuel F Joined: Jan 2003 Posts: 1,755 Washington Twp., Southern NJ	I have a Carter AVS on my 390 AMC engine. When the car sits for a few days, it will not start - it will just crank all day. I then took off the breather and I manually give it the throttle by hand and look down through the carb I do not see any gas squirting. Its not getting gas... I get a small cup of gas and pour it into the carb and it starts right up and stays running and I'm good to go. The fuel pump is new, the line is clean, and there is a new filter. I see gas in filter too...so there is gas getting there. The carb is super clean and it was rebuilt a year ago. Bizarre...could it be something like the needle/seat or float sticks and prevents gas from coming into the carb, but once the engine runs it shakes it loose, allowing gas into the bowl?

Re: Carter Carb Question AVS [Re: Fastfrankie] #1461258 07/01/13 06:52 PM 07/01/13 06:52 PM
Joined: Nov 2009 Posts: 1,281 WI W wannadrag pro stock
wannadrag pro stock W Joined: Nov 2009 Posts: 1,281 WI	Quote: I have a Carter AVS on my 390 AMC engine. When the car sits for a few days, it will not start - it will just crank all day. I then took off the breather and I manually give it the throttle by hand and look down through the carb I do not see any gas squirting. Its not getting gas... I get a small cup of gas and pour it into the carb and it starts right up and stays running and I'm good to go. The fuel pump is new, the line is clean, and there is a new filter. I see gas in filter too...so there is gas getting there. The carb is super clean and it was rebuilt a year ago. Bizarre...could it be something like the needle/seat or float sticks and prevents gas from coming into the carb, but once the engine runs it shakes it loose, allowing gas into the bowl? Not bizarre at all if you google it,it seems to be pretty common.I have a freshly rebuilt AVS and it does the same thing.Soemtimes after a couple hrs the carb will be dry.Some of the problem is the crap gas and some I think is heat soak for me.Did these carbs have any heat barrier between the carb and intake?

Re: Carter Carb Question AVS [Re: Fastfrankie] #1461259 07/01/13 06:57 PM 07/01/13 06:57 PM
Joined: Aug 2003 Posts: 43,202 Bend,OR USA C Cab_Burge I Win
Cab_Burge I Win C Joined: Aug 2003 Posts: 43,202 Bend,OR USA	Two things may be happening, one is the fuel evaporating and the accelerator pump may be the wrong size, to small Many of the over the counter cheaper rebuild kits come with the gaskets and accelerator pumps to fit many different carb application so the maufacturer doesn't have to have 12 different kits to fit all the AVS Carter carbs. made for OEM carbs. the other thing to check is the accelerator check valve sticking in the channel under the accelerator pump squirter Pull the carb. off so you can tip it upside down over a clean white towel or white paper towels to see if it(brass check valve) drops out easily or not Todays gas with Ethanol in it eats alumminum so it may be stuck in that passage Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)

Re: Carter Carb Question AVS [Re: Fastfrankie] #1461260 07/02/13 02:18 AM 07/02/13 02:18 AM
Joined: Oct 2003 Posts: 2,537 PORT ALBERNI , BC., CANADA superwrench master
superwrench master Joined: Oct 2003 Posts: 2,537 PORT ALBERNI , BC., CANADA	Accelerator pump or circuit problem...assuming the fuel pump is up to snuff. Even if the gas evaps over a few days, it should still start after 10 seconds and stabbing at the throttle a few times. I have an old '54 pickup with a single barrel flathead six in it and the check ball will stick in the accelerator pump well. Sometimes a few good taps with a hammer and away she goes. If it gets started every day or so, it works fine.

Re: Carter Carb Question AVS [Re: superwrench] #1461261 07/02/13 08:32 AM 07/02/13 08:32 AM
Joined: Aug 2004 Posts: 8,087 Elk Grove, Calif. B bigblock340power master
bigblock340power master B Joined: Aug 2004 Posts: 8,087 Elk Grove, Calif.	I'm having a similar problem with my Thermoquad. If I keep the truck in service everyday no problems. But let it sit for a few days/week, and it will not start for a few minutes. Put a cup of gas down the carb, and starts right up. I'm thinking crap gas (Oxygenated to the max, plus additives). Perhaps a weak fuel pump has something to do with it too. I'm going to get a dual action mechanical fuel pump today. I think with the crappy gas now a days, and the old stock fuel pump (that's only a few months old) is just not up to snuff.

Re: Carter Carb Question AVS [Re: bigblock340power] #1461262 07/02/13 09:34 AM 07/02/13 09:34 AM
Joined: Jan 2003 Posts: 75,020 U.S.S.A. JohnRR I Win
JohnRR I Win Joined: Jan 2003 Posts: 75,020 U.S.S.A.	There needs to be a sticky at the top of all forums wit ha tutorial for how and where to install electric fuel pumps ...

Re: Carter Carb Question AVS [Re: bigblock340power] #1461263 07/02/13 12:43 PM 07/02/13 12:43 PM
Joined: Sep 2004 Posts: 6,906 IL, Aurora A ademon master
ademon master A Joined: Sep 2004 Posts: 6,906 IL, Aurora	Quote: I'm having a similar problem with my Thermoquad. If I keep the truck in service everyday no problems. But let it sit for a few days/week, and it will not start for a few minutes. Put a cup of gas down the carb, and starts right up. I'm thinking crap gas (Oxygenated to the max, plus additives). Perhaps a weak fuel pump has something to do with it too. I'm going to get a dual action mechanical fuel pump today. I think with the crappy gas now a days, and the old stock fuel pump (that's only a few months old) is just not up to snuff. what's a dual action mechanical fuel pump?

Re: Carter Carb Question AVS [Re: ademon] #1461264 07/02/13 01:44 PM 07/02/13 01:44 PM
Joined: Jan 2003 Posts: 75,020 U.S.S.A. JohnRR I Win
JohnRR I Win Joined: Jan 2003 Posts: 75,020 U.S.S.A.	Quote: Quote: I'm having a similar problem with my Thermoquad. If I keep the truck in service everyday no problems. But let it sit for a few days/week, and it will not start for a few minutes. Put a cup of gas down the carb, and starts right up. I'm thinking crap gas (Oxygenated to the max, plus additives). Perhaps a weak fuel pump has something to do with it too. I'm going to get a dual action mechanical fuel pump today. I think with the crappy gas now a days, and the old stock fuel pump (that's only a few months old) is just not up to snuff. what's a dual action mechanical fuel pump? Pumps on both the in and out movement of the arm

Re: Carter Carb Question AVS [Re: JohnRR] #1461265 07/02/13 03:33 PM 07/02/13 03:33 PM
Joined: Jan 2003 Posts: 1,755 Washington Twp., Southern NJ F Fastfrankie OP top fuel
Fastfrankie OP top fuel F Joined: Jan 2003 Posts: 1,755 Washington Twp., Southern NJ	I attempted to start the car today. Nothing...no gas squirting either. I go take the hose off the carb and gas starts spraying out - there was built up pressure. I took the top of the carb off and it seems that the needle and seat is sticking. When the float drops, sometimes the needle stays in there. If I blow into the gas port, air only blows out of the other side/float. The needle on the side closest to the drivers side stays in there. I rebuilt this carb 2 years ago with a Pep Boys carb kit. I just ordered a new Borg Warner kit with new needles/seats. I don't understand how its sticking - clean as a whistle and not much use at all - no visible wear. Maybe the carb kit was cheap...

Re: Carter Carb Question AVS [Re: Fastfrankie] #1461266 07/02/13 03:46 PM 07/02/13 03:46 PM
Joined: Jul 2008 Posts: 609 Boise M Moparteacher mopar
Moparteacher mopar M Joined: Jul 2008 Posts: 609 Boise	If the float drops too far the needle can bind. Also, the main wells on the bottom of the carb may be porous.

Re: Carter Carb Question AVS [Re: Fastfrankie] #1461267 07/02/13 03:55 PM 07/02/13 03:55 PM
Joined: Apr 2012 Posts: 18,880 - R RSNOMO Moparts Torchbearer
RSNOMO Moparts Torchbearer R Joined: Apr 2012 Posts: 18,880 -	Have you given the sticky N/S a shot of carb cleaner???

Re: Carter Carb Question AVS [Re: RSNOMO] #1461268 07/02/13 05:48 PM 07/02/13 05:48 PM
Joined: Oct 2003 Posts: 2,537 PORT ALBERNI , BC., CANADA superwrench master
superwrench master Joined: Oct 2003 Posts: 2,537 PORT ALBERNI , BC., CANADA	I'm gonna throw this in there.......A few years ago I decided to give Aviation 100LL fuel a try. Can't say it helped a lot, but one thing I noticed was that after the car sat for a week or so, I either couldn't get fuel in the bowls, or on the other side of the coin...it would flood. Did some research and came to the conclusion that Av gas is too "Dry".....the needles would stick. Started using 94 pump gas again and the problem stopped. Just saying....

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