What is the best way to drain a gas tank on a 86 honda prelude

you might need a new fuel pump. with a full tank of gass it is easy to pump the gass but if the pump is bad it will struggle with 3/4 tank of gass

first is there gas in the tank first, then check the fuel pump- take out the fuel hose that lead to the carburetor and crank the engine to see if fuel is coming, if not , check all hose leading to the tank - if ok , check the fuel pump- also check fuel filter too . let me know what is doing

This 86 Honda Prelude does not have a link connector, code's are read from the computer it's self, the computer is under the passenger seat or under the carpet on the passenger side, you count led light flashes and on the computer panel will have the trouble code's refernce.

Have you checked with any radiator repair shops. What seems to be the problem with the old one?

If it has been sitting for 3 years it could be a number of things. First thing to try is a good tune up (plugs, wires, oil change, air filter, and fuel filter). If the plugs have fouled out they are not getting enough spark to burn the fuel. Also if the fuel itself has turned, you should try to drain the tank, this is not feasible at times and can be substituted by adding as much fresh gas as possible and a can of Octane boost/ Gas drier. SeaFoam is what I would recommend (found at your local autoparts store. If you have over half a tank of gas that has been sitting that long, you will need to find a way to drain what is in it. There are a few tricks to doing this without dropping the gas tank or sucking it out with a garden hose. Try the tune up first though.

scrap it buy a new car

Try changing the gas filter - could be a clogged filter, and draining a bit out moves the blockage out of the way.

I woulldn't worry about that fuel too much. Let me know if you have done anything to the motor, i.e., cleaned the spark plugs, checked the oil, water/radiator fluid level...corrosion on the battery. What does it sound like when you try to start it?

They make products to add to the gas...fuel stabilizer for example.

Best way is to call a salvage yard and ask how new a motor you can use. Just tell them your looking for one.

check the drive belt and make sure no vacuum lines got knocked off especially the one behind the throttle body and put some STP in the gas tank make sure it has at least a half a tank of gas when adding