There is no solenoid in your gas tank. It's either a bad purge or vent solenoid, a leak in a vacuum line or a leak in the charcoal canister. GM has experienced lots of problems with the vent valve and tubing plugging up and staying open. That causes the engine to suck in too much air and kill your gas mileage. Start by testing/checking the vent solenoid
SOURCE: No heat when temp goes below freezing, gas leak when tank is full
blower motor or heater core is bad and the gas problem could be over flow line been put on wrong just letting gas just come out of it when its full.
Fuel injected cars have a fuel return back to the tank. Get a Chilton's manual for the car, it will show where everything goes.
SOURCE: 1999 2500 Chevy 4 x 4 Silverado 4 Fuel Pump
before all that do a pressure test and see if the pump is working..
the tank has to be drained and removed.i would not cut a hole in the box.
disconnect the battery,and ground the pump assembly if you are worried about static.
The size of the engine alone will not
determine gas mileage. There are many other
factors including vehicle weight, design of the motor, etc. So in answer to
question 1, size isn't going to matter.
For question #2, make sure you change the
oil, oil filter, air filter and keep the tires inflated to recommended specs.
That might help you out a bit...
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