I need to remove fuel in my 1996 Ford Mustang.

Open the fuel rail supply line at the fuel rail (need special tool) and pump the fuel out of the system until it no longer smells like diesel.

The system needs to be professionally flushed out.

Was the fuel pump recently replaced? If so, the smell is coming from the seal where the fuel pump seals to the gas tank. It's a large o-ring and if not put in properly you get the gas odor.

i believe that there is a ball inside the inlet of the fuel tank to prevent fuel spill due to roll over and keeps people from stealing your gas, it sounds like it might be stuck i would find something that you could run down the neck and give it a little nudge. a clothes hanger might work

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yes, there are special ford fuel line disconnect tools available at auto parts stores and catalogs such as Harbor Freight.........

yes u can but you will loose performance and fuel mileage, it will really not be worth the few cents more you pay, if you use the midgrade 89 octane that is a better choice.

Fuel comes in different grades due to octane levels, the higher grade the higher octane, the higher price. If you have the owners manual or window sticker, you would see that the car was probably made to run on 87 octane (regular unleaded), I have been through the different octane levels for more than 30 years and I have decided that the cheapest runs as well as the most expensive. The higher octane will sometimes cause an engine to ping or rattle under acceleration, if this happens to yours go back to the cheap stuff and everything will be fine. That is my opinion, others may differ, but I run my BMW on the cheapest I can find and I still get 31 MPG hwy.

LOL, dont add to the environmental mess just yet!

have you replaced the sending unit for the gauge? its located usually in the intake manifold somewhere, or on one of the cylinder heads.

If thats not the problem, you may have a wire grounding out behind the dash.

my best advice is to try an aftermarket monitoring gauge with fresh wiring to the sending unit or sensor to check for this problem... hope this helps!

replace plugs every 24000 miles or so(two years) buying good quality parts is another good idea. shop around, cheap parts are cheap for one reason. regular tune ups will help your car run and perform better. being easy with the gas pedal will help also