why does my gas tank have water after being parked for 3 or more days

Asked by Jul 29, 2015 at 02:44 PM about the 2006 Chevrolet Silverado 1500 LS 2WD

Question type: Maintenance & Repair

Hello my gas tank always has water after it is parked for 3 or more days, i recently saw that the gas cap was sweaitng I would like to know what is wrong with it the truck wont run untill i drop the tank and take the gas out and add new gas.

4 Answers


Simple condensation will collect in tank, especially if where you live is humid and has a big difference in the high an low temperatures ..day and night. As in 90° day/60° night. But geez, that much water almost seems like somebody is messing with you, putting water in. Possible...? Maybe...? If you can rule that out, condensation, as stated, will collect but that is too much for ordinary conditions. Best suggestion is fill it up, and keep it full...even if you only drive 50 miles or so, keep it topped off and see what happens then. Also, an OBDII scan wouldn't hurt, CEL lit or not. The EVAP may have an issue.


And clean water or coolant....? Afterthought, going under assumption we are talking just water. But if it's engine coolant, whole 'nother ballgame


condensation is one thing.. first change fuel filters...union oil some years back had some bad gas sent to some of its dealers...spent 2 months dropping tanks...anyway did yo get a bad batch? buy some of this...http://www.autozone.com/fuel-and-engine-cleaners-additives/fuel- additive-and-cleaner/valvoline-12-oz-water-remover/33412_0_0/

1 out of 1 people think this is helpful.

It is likely he has E-10 in it and it got polluted with enough water to phase separate the fuel. Tank needs to be completely drained and fresh gasoline installed. No amount of additive will fix phase separation. Keep the tank at lease half full and don't worry about the condensation unless it is on the inside of the filler neck or tank.

Your Answer

Add photo

Related Questions

  • Water pump 3 answers

    I have a 99 silverado and I think the thermostat is sticking but when I went to fill it up with water it is poring str8 through out the bottum??? Is it the pump?

    1999 Chevrolet Silverado 1500 3 Dr LS Extended Cab SB


    Maintenance & Repair

  • Engine Shutting off after about 10-20 seconds on 2004 Silverado 1500 53 answers

    Can anyone shed some light on this problem. After driving my 04' Silverado 1500 all day without any problems, after the truck sat in the driveway for a couple of hours, the truck started right up, but...

    2004 Chevrolet Silverado 1500


    Maintenance & Repair

  • 2004 silverado Z71 flashing check engine light 46 answers

    my check engine light has come on and had started blinking just lately. which means engine misfire. after replacing the plugs and wires the truck seems to have a rough idle and still seems to misfire ...

    2004 Chevrolet Silverado 1500 Z71 Crew Cab Short Bed 4WD


    Maintenance & Repair

  • 1998 Chevy Silverado misfiring rapidly! Help please! 8 answers

    I was driving my truck the other day and it was running fine and all of a sudden it started running extremely rough and misfiring like crazy. It also started running really rich and also gas is lea...

    1999 Chevrolet Silverado 1500 3 Dr STD 4WD Extended Cab SB


    Maintenance & Repair

  • My C10 69 gas gauge doesn't work right, one day is full tank and the next day is like 3/4. Any ideas? 2 answers

    1969 Chevrolet C10


    Maintenance & Repair

Silverado 1500

Looking for a Used Silverado 1500 in your area?

CarGurus has 148,535 nationwide Silverado 1500 listings starting at $1,800.


Search Chevrolet Silverado 1500 Questions

Chevrolet Silverado 1500 Experts

#1 John Carson
John Carson
Reputation 1,650
#2 Silverado_owner_2006
Reputation 1,440
#3 tenspeed
Reputation 1,350
View All

Related Models For Sale

Used GMC Sierra 1500
1,156 Great Deals out of 57,808 listings starting at $995
Used Ford F-150
3,391 Great Deals out of 203,570 listings starting at $1,273
Used Dodge Ram 1500
566 Great Deals out of 12,973 listings starting at $1,200
Used Chevrolet Silverado 2500HD
436 Great Deals out of 29,278 listings starting at $2,998
Used Toyota Tundra
668 Great Deals out of 28,116 listings starting at $1,599
Used Toyota Tacoma
775 Great Deals out of 33,029 listings starting at $1,900
Used Chevrolet Tahoe
1,067 Great Deals out of 32,279 listings starting at $1,495
Used Chevrolet Colorado
320 Great Deals out of 17,033 listings starting at $2,295
Used Ford F-250 Super Duty
478 Great Deals out of 42,571 listings starting at $2,995
Used Chevrolet Silverado 2500
4 Great Deals out of 257 listings starting at $4,500
Used Chevrolet Silverado 1500HD
13 Great Deals out of 293 listings starting at $4,700
Used Dodge Ram 2500
176 Great Deals out of 5,586 listings starting at $2,900
Used GMC Sierra 2500HD
123 Great Deals out of 13,837 listings starting at $1,500

Used Cars For Sale

2017 Chevrolet Silverado 1500 For Sale
24 Great Deals out of 77,555 listings starting at $19,398
2016 Chevrolet Silverado 1500 For Sale
324 Great Deals out of 18,454 listings starting at $15,995
2015 Chevrolet Silverado 1500 For Sale
336 Great Deals out of 7,667 listings starting at $16,397
2014 Chevrolet Silverado 1500 For Sale
459 Great Deals out of 11,056 listings starting at $10,990
2013 Chevrolet Silverado 1500 For Sale
282 Great Deals out of 6,548 listings starting at $9,950