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You shouldn't have to pump the gas for a fuel injected vehicle to start. Where is the very loud noise coming from? If it's from the gas tank, then it very well could be the fuel pump beginning to fail. Sometimes you get no warning. You just get stranded. A mechanic would likely check your fuel pressure with a gauge.
Could be a hole in your header, you can either take off your headers completely ( pain depending on your car ) and check them for holes, or you can take it somewhere and have them checked. Other than that it could be a hole in your exhaust/exhaust manifold.
There sounds to be a massive vacuum leak, check all hoses coming off the intake manifold rap your hand around each one to see if the leak gets lower this will help you find it. this is what i think the noise is.
If the noise occurs as you move off in reverse it could be the exhaust system touching the body as the engine tilts forwards in reverse. Check exhaust hangers as well as exhaust alignment. Also check condition of engine mountings as well as front engine mounting buffer as this tends to perish and disintegrate.
This seems to be a classic case of "disentegrating exhaust system syndrome." There is either a hole(s) somewhere in your exhaust system or there is a leak somewhere. Probably the easiest way to tell where the noise is coming from is to start your car and just listen around in the engine bay, under the car, and at the muffler. Also do a visual inspection of the exhaust system to see if you can see any holes in the piping. I have also seen hairline cracks in the exhaust header itself that can cause the loud ticking noise that can be a little tricky to track down.
We have a 97 camry, and just recently had what sounds like the same problem. We were told it was a crack in the exhaust where the exhaust comes out of the engine. Took it to a exhaust place and they just welded the crack for 20 dollars and the problem is now fixed.