car running better when on empty???

car running better when on empty???

Postby markykarky96 [OP] » September 22nd 2013, 4:05am

i have a 98 astro and i just noticed the other day i took a little road trip about 70 miles out and when i got there i was just about red lining on gas but i did notice that the van ran much better. it didnt shake and it ran great. once i put some gas in and i started it up it ran like crap all over again. what can this be??
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Re: car running better when on empty???

Postby Jasen » September 22nd 2013, 4:13am

When was the last time you changed the fuel filter. Some Lucas fuel system cleaner might help as well.
I replace the filter 1 a year and a bottle of Lucas in the spring and fall, in fact I just put a bottle in today.
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Re: car running better when on empty???

Postby markykarky96 [OP] » September 22nd 2013, 4:18am

i replaced it before the summer came so i doubt that the filter is bad. i also use lucas like 3 times a year.
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Extra Info: 4.3L rwd conversion

Re: car running better when on empty???

Postby Mmusicman » September 22nd 2013, 4:53am

Fuel pump pick-up is spring-loaded against the bottom of the tank. So regardless of empty or full, you are always pulling from the very bottom.
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