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I would change all the fluids and either try dry gas or i would recommend that the gas tank be thoroughly drained and new gas put in the tank.If you have a hard time getting started try to use starter fluid in carburetor or if you have none just use gas. If the vehicle is equipped with fuel injectors locate air filter and follow air duct to engine that is where starter fluid or gasoline will have to be pored to prime the injectors.if it don't start the engine should be tuned up with a major tune up replace all filters ect even if it starts without tune up i would tune it up asap!
You need to do a complete tune-up on the van. If the battery is 4 years old or older then replace the battery. If not check fluid level in each cell, if low you can fill to correct level with distilled water. then you can charge the battery. Using a volt meter you can check the alternator at the positive post on battery with the van running to see if it is charging correctly. You should have 14.5 volts to 15 volts. check the air filter and replace if dirty. Check the spark plugs and replace old plugs. replace the fuel filter on van. hope this will help you.
Clean out the Throttle body with throttle body cleaner
Clean out the MAF sensor
This should help you get your van running 100% soon. If your on a tight budget, start with Cleaning the throttle body with spraying throttle body cleaner into the throttle body and cleaning up the MAF sensor with MAF sensor cleaner, just follow the instruction on the can. Then replace the PVC valve and add fuel injector cleaner in to the gas tank. This should help your engine running better and then you can do the rest of the work to complete the tune up. Good luck and keep me posted. If you go to Auto Zone, you can get all the things you need and they can scan your van for any DTC codes that may also indicate what issues your engine has.
What engine? When was fuel filter changed last, and have you by any chance has fuel pressure tested, preferably when no start?
Tried spraying WD-40 into intake at front of throttle body, with plate open, and then try to start.? Sounds a lot like fuel pump going but lets be sure.
I'm leaning toward a bad sensor, as in throttle body temperature, or coolant temperature sensor. The smell of too much fuel is probably from pushing pedal to start, which shouldn't be necessary on a fuel injected vehicle. What does it do if you leave your foot off the gas pedal during start? As far as fuel filter goes, if it hasn't been done in a while, I'd do it anyway just as preventative maintemance if nothing else.