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First question is yes bad or worn plugs can burn more gas to generate the same amount of power. Second question, you could fill up the tank and record the mileage, then fill it up again when it measures half a tank and compare. If the gas gauge is working correctly it should take half the total number of gallons the tank holds to fill it up again. And the miles you drove divided by the number of gallons used equals your gas mileage.
Check your fuse , check the wires to the gas tank , could be the mechanism inside the tank , if you cant get it working use your trip meter as a gas gauge so you don't run out , just reset it when you fill your tank and refill before a set # of miles , lets say 200 miles , just fill the tank and reset the trip meter , just remember to fill the tank full and reset to 000 every time so you wont run out of gas
I have a 4cyl 97 jeep wrangler. My fuel economy went from 75-80 miles per 1/4 tank to 55-60 miles per 1/4 tank of gas. I traced this to a bad coolant temp sensor (replace twice), and fouled O2 sensors believed caused by my self by placing too much oil on spector air filter (now wipe off excess and let dry in sun), and using carb cleaner and or gas treatment (stopped using). fuel economy went back up to 75-85 miles per 1/4 tank. (also disruption of sensor input/output signals didn't help from battery sliding into computer wiring harness, which I cured by placing a 1" spacer on rear clamp to keep battery away from computer.)
Assuming you put enough gas in the tank to turn the car over (2 gallons is a good start) and assuming the gas cap is on good and tight then it sounds like in drying up the tank you put all the containments sitting at the bottom of your gas tank into the fuel pump sock and it is now clogged. Changing the fuel pump is that fix.
You may want to check the fuel filter too first before the whole dropping the gas tank to get to the fuel pump scene. Its possible the fuel filter has got really clogged and will not let fuel pass. They can go just like that if it has been several thousand miles since last changing it. The fuel filter for this vehicle is on the passenger side rail, about midway, on the undercarriage of the car. The fuel line coming from the fuel pump leads right to it.
try this first. the older the car; the more problems the ethanol gas is causing. replace the fuel filter. you'll probably see what you think is dirty gas; it is; in a way. it's the ethanol goop that stays and ruins engines, and fuel systems. install the new filter. add a whole can of SEAFOAM to at least a half tank of premium gas. replace fuel filter before next 500 miles.add can of SEAFOAM every 3000 miles after that, and that will clean the valves, the goop, the carbon and keep your tank and lines free of moisture, It might take afew miles(depending on the clogging), but it should work. I hate ethanol gas.
85 ford 350 econoline van with 460 engine and duel tanks, lost prime on both tanks, cannot get gas up to inlet on carb, it happen after having shot work on vaccum lines, i can't hear the pumps in the tanks making a buzzing noise, i hear a click when i switch from front tank to the rear tank , somewhere under the hood, on the driver side front fender, what is the next step.
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