fuel taking a long time to get to 390

keisha9 · #1 (**permalink**) 10-22-2009, 01:13 AM

when cold my truck takes a while about 20 seconds of cranking before it will start . after this it fires right up .. does anyone know why its taking so long ? could my furl line be too thick .. or could i need a electric furl pump so that the furl is always "right there" at the carb?

85e150six4mtod · #2 (**permalink**) 10-22-2009, 02:13 AM

"Cold"? How cold? Choke working? What do you have for ignition?

Krewat · #3 (**permalink**) 10-22-2009, 12:56 PM

Also, are you pumping the pedal a few times BEFORE you crank it to set the choke and pump some gas into the intake?

keisha9 · #4 (**permalink**) 10-22-2009, 06:07 PM

the choke works and it is manual choke. the edelbrock carb is new. when i say cold i mean if i dont drive it for a week and try to start it then it does this. if i drive everyday then it works normal.

keisha9 · #5 (**permalink**) 10-22-2009, 06:08 PM

oh yea I pump it alot trying to get the fuel up there. you know what? F this im going out there right now and i'm going to find my problem . me and muddy buddy weizer that is ..ill let you guys know if i find anything but comments are still welcome

Krewat · #6 (**permalink**) 10-22-2009, 06:25 PM

After waiting the amount of time it would usually take for this to happen (a week), take off the fuel line from the carb, put the end into a bucket or big jar, and crank. See if it's really not getting fuel, or something else is going on.

Maybe the fuel pump valves are leaking, and the fuel siphons all the way back to the tank? Or there's some air leak somewhere that you don't know about?

Kennewick · #7 (**permalink**) 10-25-2009, 12:04 AM

Could it be leaking out of the bowl? I had that peoblem, it was leaking out the accell pump right onto the mani. Took about a day for it drain down.

keisha9 · #8 (**permalink**) 10-25-2009, 10:22 AM

i have msd ignition..i am waiting a week then will pull the fuel line off the carb and see if fuel is present. if not then i will investigate the bowl of the carb leaking.. thanks . what did u do kennewick to fix your problem?

Kennewick · #9 (**permalink**) 10-25-2009, 12:09 PM

Quote:

Originally Posted by keisha9

i have msd ignition..i am waiting a week then will pull the fuel line off the carb and see if fuel is present. if not then i will investigate the bowl of the carb leaking.. thanks . what did u do kennewick to fix your problem?

You can buy the accellerator pump parts from any parts house. I assume you have a Autolite 2100 but that is something you will need to know. There is the possibility you may need to do a complete rebuild. The Autolites are easy to rebuild. If you do you need to, pay attention to the ventury shaft as they get loose in the bore. A machinist can punch the hole and insert a bushing restoring it to spec.

Good luck my guess is you don't have a huge problem, just take your time school yourself and have fun.
PS there is a small check valve(looks like a small rubber plug, becareful as if you pull on it it could just break in half. If you pull the carb top you can see where it penetrates through it's bore) also there is a diaphram which is where your leak could be comming from, There is a spring pay attention to direction and a gasket. Mine leaked right through the diaphram right out of the housing through the little weep hole onto the manifold a drip at a time till empty.

keisha9 · #10 (**permalink**) 10-25-2009, 04:11 PM

i'm running an edelbrock 750 and its fairly new but i will still check that out too

Kennewick · #11 (**permalink**) 10-25-2009, 04:43 PM

Thats a lot of carb what are your motor specs? I was thinking stock.....Not!

This is on the 56 right? You just list a 390. Great project though. My Brother had a 56 with a nice 302. White with a touch of brown in it to take the bite out of the white and bronzed windows. Nice trucks.

keisha9 · #12 (**permalink**) 10-25-2009, 09:08 PM

yea, well its actually a 360 but 1 day a 390. edel intake , headers, msd ignition. other than that its stock 360.

Argess · #13 (**permalink**) 10-25-2009, 10:09 PM

I have the same problem.....if I let it sit for more than a few days, it cranks a fair bit. I don't have a choke hooked up, but a few pumps and it always catches.....unless I leave it more than 2 or 3 days. Then it takes a lot of gas pedal pumping.

I do know that sometimes the fuel line drains back into the tank, so the fuel pump one-way valves arn't doing % of their job, but I can assure you, the pump can fill up the line and carb float bowls very quickly. Besides, I'm also quite sure my float bowls are still (mostly) full.

I suspect fuel in the intake manifold has evaporated out and the accel pump galleries have siphoned dry (back to the fuel bowls). Intake drying out due to exposed airfilters and accel pump drying out as I have Holleys and there isn't much to stop a reverse siphon...at least to the level in the bowls.

If you solve your problem, I hope you will post the solution.

Bear 45/70 · #14 (**permalink**) 10-25-2009, 11:36 PM

This sounds more like fuel draining back to the tank thru the fuel pump, indicating the valves in the pump are not sealing properly. The carb going dry is no big deal if the fuel line is full up to the carb. The pump will fill the carb in just a couple of revolutions. If the line drains dry clear back to the tank, then the pump has to suck fuel from the tank before the carb gets it. Fuel pumps don't suck and pump air worth a damn.

Kennewick · #15 (**permalink**) 10-26-2009, 02:07 PM

Quote:

Originally Posted by keisha9

yea, well its actually a 360 but 1 day a 390. edel intake , headers, msd ignition. other than that its stock 360.

Not that it is any of my business but that is alot of carb for a stock 360. Does it drive good? Just curious.