Leave the car set all day. Won't start. Bang on

Well it could be numerous if things but you want suggestions...So here's mine..Your gas tank might be vapor locked...This is caused from over filling your gas tank with gas over the years..Its when the pressure in your gas tank becomes greater than your fuel pump. It wont start until the pressure in your gas tank becomes lower then you fuel pump...Sounds crazy...This got me once...I didn't understand it...A lot of people (including me) Go to the gas station and get that extra 50 cent after the gas nozzle clicks off...over time that extra gas will run down the vapor lines intended to burn fumes....Like when you fill a gas can to cut your grass...If you sake the gas can it builds pressure and bows up. But with time that pressure will go away...Well saying that...Your gas tank needs to vent to....So your car burns not only gas but fumes...If you keep over filling your car with the extra gas it cloggs up your vapor canister intended for fumes or vapors...The gas will will go into that canister and clogg up the charcoal that's inside it. (Breaks it down) then the vapors can't get to your carburetor where it supposed to burns it. So what happens is the pressure in the gas tank becomes greater than your fuel pump and then car won't start..Are you with me? Lol Its crazy..Putting a different gas cap can cause the same thing...Simple test...When you open your gas cap to get gas.. Do you heat air sucking in.. Yes you can hear it....A lot of times loosening the cap let's the pressure out and the car will start right up.....Thus might not be your problem but worth telling at the gas pumps to other people..... Just trying to help

You should have a check engine light on this needs to be diagnosed first. No light then the possibilities are unlimited...... cam sensor ...fuelpump... fuel pump relay.... oil pressure and or levels

Very likely the fuel pump has failed, if you mean you tapped on the gas tank
and it finally started. When a pump fails, sometimes rapping on the tank will re-energize it briefly or maybe even a couple of times before it gives out for good.
If you were tapping on the gas pedal, though, and it just started, your mechanic will have to look at it. Too many electrical fault possibilities, Scott, it needs proper diagnosis to find the p[roblem.

You need a fuel pump .

There are two things you will want to check: is your vent tube clogged up, and is your fuel filter clogged up? It might be an internal-tank fuel filter.

Fuel Filter? Fuel Pump? Bang on the gass tank with a mallet when it wont start while some one trys to start it if it starts its the pump

ck to hear if fuel pump is working,,if not have someone bang on bottom of gas tank,,while starting car

If you are having to bang the battery cables that is where the problem is you have a bad connection either in your connections or you have bad terminals install new ones another thing is you may have to put anti freezing liquid into your gas tank to keep from gelling and you may want to park in a garage it helps a little.

I would say it sounds like an a electrical ground problem. Either the grounds to the fuel unit at the tank or the one running in the wire harness. I wish you luck and try to have a great day.

its your fulepump