My 1997 astro van is using alot of gas what could

It is because the Fuel lines going to your spider is busted. After you determine they're, Stop at a local parts store and spend 2 dollars for the proper fuel lines like I did. Don't pay over 2 bucks for these lines.

Insert washers into spider first. Then insert fuel lines. The small popet lines will break like glass, so try not to touch them. Don't let anyone tell you that you need a spider, Poppets leak in the head not the intake. Remove the Black cap from the top of your Intake, the round one. Take a light, If the driver side intake is clean on the inside then you have bad fuel lines, busted. If the passenger side is clean then you have a bad fuel pressure regulator which can be purchased seperately on the internet if you search for it for about 50 bucks.

I replaced the lines in about 2 hours, which means pulling to top half of the intake off, sometimes you can reuse the intake gasket if you're good, and use proper resealant.

Hey, make sure you post back. Also, the Coolant temp senser can cause your van to run badly and use gas.

You may need a tune up, spark plugs and plug wires. I would also consider replacing the fuel filter, if it has been replaced. Also check the air filter.