Thanks to all whom can help. I have posted this problem before. I got some good feedback but the problem is still there. I have a 1970 plymouth duster with a 360 in it. I have an edelbrock 750 on it. What happens is after car has sat for a week it will not deliver fuel. I can crank until the battery is dead. If I prime the carb with fuel or carb cleaner it will start. It will continue to start if I start every other day. If I dont start it, it will not start until primed. I have changed the fuel pump, adjusted mixture screws, checked choke ect. By the way it has an electric choke. Does anyone have any ideas????? Again if I start it once it has no problem for a couple of days. I even took fuel cap off thinking vapor lock. This carb is somewhat new to the car and was slightly used. But I had it on there for 4 or 5 months with no problem. This started out of the blue. Thanks for all the help you can give me. Tod toddemont@verizon.net 540-710-0898 after 4pm

I'll guess that you are still running a stock style pump, switch to an electric so you can prime the carb before you start it.

If you already have an electric pump check the needle and seat on the carb, it may need cleaned or replaced.

I will do that. What would be needed to run an electric pump? Is there install kits for these? Thanks Tod

Welcome to new gasoline formulas.

I drove my 79pW everyday, so that was never a problem.

My 64 Fury would sit all winter, but I'd get it out of storage when it was still cold out, a couple of pumps, she'd fire right up.

My Charger has no choke at all, so I HAVE to prime it with raw fuel, so I am used to it.

Any other advise? I just want to get in and turn key. I have a edelbrock 650 on my Demon and I use the same fuel from the same station, and have no problems with the fuel.

after the car has sat for a week (1)see if a stream squirts out of the AP when you move the throttle (without touching the starter) (2) take the top off & see if your gas has evaporated or (3) disappeared into a pinhole leak.It's gotta be going somewhere.

The gas appears gone. If so then why wont the bowl fill back up after extended crank time? I ran out of gas one time and it started after about 5 seconds. Thanks for the help Tod

the gas is evaporating from the bowl vent.eddys are getting famos for this

you can just add a small elec fuel pump back at the tank and prime the carb before cranking it over,this will fill the bowl and fire it right off every time

some times the fuel will drain back to the tank also,so cranking will be more till the line,pump,carb are full then it will start

after sitting for a week you can just get a dish soap bottle with a little gas in it and prime the carb through the vent tube then start it

tired of the eddy yet?

I went back to a Q-jet on my teen cause the eddy was doing this all the time

the cheap gas is no help either IMO

Are you saying use both pumps? The thing is this just started happening out of the blue. My 600 edelbrock was on this same car and I had no issues. Car runs fine once started but will kill a brand new battery if it sits a week. Tod

yea just one of the little cheap inline banger pumps

you can run both with no prob,flip the switch on and give it a second then hit the key

and you can allways turn the elec pump back off after its running,the stock pump will still pull fuel through it

most wimpy stock pumps could use the help IMO

keeps from opening the hood to prime and jump start it

Sounds like I am going around the problem rather than fixing it. Why do you think the carb just needs a prime and then it will start? If you dont prime it, it will crank until battery is dead. How come it needs primed? If the fuel is evaporating shouldnt the fuel pump put fuel back after extended cranking? Once primed it will start no problem for a couple of days before no start happens again. Tod

That happenned top me on my carter. It needed a rebuild and then it was good. It might be dirt or an internal gasket leak. Anytime I put a carb on a car if it is of unknown condition, i rebuild first.

Darren

you are correct it very well could be a weak fuel pump

could have pin holes some where in the line also letting it suck air

do you have a clear fuel filter you can see with the fuel in it

I guess I will try cleaning it first. It has served me well for 4 months even at 135 mph. I still dont understand why it runs perfect after primed, for a couple of days. If I let sit a week it will no start on me.

Maybe other parts of your fuel system. People jump at the carb immediately, not looking at the pump, filter, steel and soft lines, tank, cap, vent...

79 is right

hear eddy carb and

found holes in my line when I put a clear fuel filter on,I could see air bubbles in the fiter

need to more

The Edelbrock carbs do not have a backflow prevention valve on the carb inlet (like the 2-bbl Carter carb on my Super Six did), so the fuel pump needs to be good (read good seals/valves) in order to keep the fuel in the line so it's there when you start the engine.

I'm not sure if there's such a thing as a check vavlev for fuel lines, but if the fuel pump isn't keeping the fuel in the line from the pump to the carb, you need a new fuel pump. My Eddy 1406 starts at the first turn of the key and I haven't had any fuel drainback problems.

The Carter on the Super Six did have the drainback issue due to a worn fuel pump. It would start right away and run on the fuel that was still in the carb, but once that fuel was used up, the engine would die and I would have to crank it for 15 seconds or so until the fuel pump filled the line and carb again.

In you case, even if the fuel is evaporating from the carb bowls, there should still be fuel in the line and it shouldn't take that long for the fuel in the line to fill up the carb's fuel bowls, and eventually start the engine.

A quick test would be to run some clear tubing in place of the fuel line from the fuel pump to the carb, crank it over and watch what happens inside the line (disconnect the coil wire so it doesn't fire the engine). If the pump pumps fuel to the carb and it drains back out, you know the pump is not holding pressure and should be replaced. New pumps can be faulty, too.

the problem with eddie carbs is that the choke adjustment never stays put and
it always changes. deal with it, or go with a manual style choke.

I thank everyone for the posts. I will take all the advise into consideration. I will post the fix in a couple of days so stay tuned and thanks to all whom helped me out. Tod

i had this EXACT SAME PROBLEM. What ended up fixing it was a 1" 4-hole phenolic spacer, that stops the gas from boiling out after you shut down the engine, and heat soaks back up into the carb. You'll gain 2 things with the spacer, it will always start perfect, and you'll get a better signal to the carb and have really nice crisp bottom end throttle response. Having your choke adjusted properly also really helps, it was only the spacer that really solved the problem, now i just get in turn the key and vrooommmm, starts every time; where before i would have to crank, crank, crank, take off air cleaner, squirt gas in the carb, crank and start; sometimes i would actually flood it trying to start it.

I agree with Scratchinfotraction, check your rubber fuel lines for pinholes/air leaks. May or may not be the case, but my truck did the same thing, I found a porous rubber line under the cab, fixed it, and it started almost immediately.