gas tank help???

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gas tank help???

Postby 1iwilly [OP] » July 26th 2009, 12:03am

hello to all
i have a 97 awd ls accourding to the owners manual i have a 25 gallon gas tank
so if i run the tank all the way down until it is sitting on the actual empty red line when i re fuel should it take real close to the 25 gallons today i have to just about force 20.00 gallons i'm thinking that my gauge is kind of off
if when i'm driving and it shows 1/2 tank when i shut the van off then back on it will read between 1 to 2 lines over a 1/2 tank.??
Original Poster [OP]
1iwilly
Fueling (3/4 tank)
Fueling (3/4 tank)
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Re: gas tank help???

Postby ihatemybike » July 26th 2009, 2:57am

These vans are know to have the fuel gauge jump around a little bit. Just think of those last five gallons below E as fuel reserves.
Aaron

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Re: gas tank help???

Postby astro355 » July 26th 2009, 4:52am

Wow, I didn't know the newer ones came with a 25 gallon tank. I have to take a look at that. My 20 gallon tank is annoying on long hauls.

And my gas gauge is empty at 1/4 tank, sometimes. I never let it go below half anymore. Someday I'll fix that, someday.
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Re: gas tank help???

Postby Matrixx » July 26th 2009, 6:27am

Hi 1iwilly

Actually your fuel tank is:
27 US Gallons
22.4 Imperial Gallons
or
102 liters

2 gallons are unusable fuel.
Running your tank that low, is very hard on the fuel pump.
It's usually the sending unit inside the tank that gets faulty and then gives the odd readings your seeing.
Sometimes a bad ground or power supply can give off the wall readings as well.

Just a couple of things to look at.:)
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Re: gas tank help???

Postby 1iwilly [OP] » July 26th 2009, 2:48pm

thanks for all the replies
i think the tank was remove before as to one of the fuel lines look very new. i'll wait until it is very low then take tank down and check for ground
Original Poster [OP]
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Fueling (3/4 tank)
Fueling (3/4 tank)
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Re: gas tank help???

Postby ihatemybike » July 27th 2009, 2:06am

Here's the tank sizes and which years had them. I unfortunately have three vans with 25 gallon tanks, after I was used to the 27s.

Tank Sizes
17 gallon 1985-1989
27 gallon 1985-1996 GM24
25 gallon 1997-1999 GM24B
27 gallon 2000
27 gallon 2001-2005
Aaron

2005 Astro (Gandalf) - AWD, 4.3L, 3.42, 130k+ miles
1997 Astro (Grumpy - $250 Rally Van) - AWD, 4.3L, 3.42, LSD, 2" lift, 31" tires, 335k+ orig engine, $30 eBay fuel pump
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Re: gas tank help???

Postby astro355 » July 27th 2009, 3:59am

That seems a little odd. My tank will hold 20 gallons, unless the pumps are lying to me. I'm not completely filling my tank everytime but I easy put in 18 to 19 gallons regularly.
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Re: gas tank help???

Postby Matrixx » July 27th 2009, 4:02am

Maybe they changed in the middle of 1997 with the fuel tank capacities. Here is what it says in the 1997 Owners Manual:
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Re: gas tank help???

Postby 'cudapaul » July 27th 2009, 4:15am

Originally, Chevy had a 19 (standard) or 27 (option) gallon fuel tank.

I believe that either in the late 80's or the early 90's (89-91) they dropped the standard 19 gallon version and made the 27 gallon standard. For some reason, probably emission related, they started listing the fuel tank as 25 gallons for a few years, and then went back to showing it as 27 gals.

Trust me, it doesn't matter what year your M/L van is, the larger fuel tank was always 27 gallons. And then some.

I'm not proud of it (potential fuel pump damage form running dry) but one time I put in about 27.2 gallons!
You will find that when the pump shuts off, you can add at least another 3-4-5 gallons into the tank.

And you're not filling up the evap cannister!
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Re: gas tank help???

Postby astro355 » July 27th 2009, 4:19am

That's very true. Those pump handles are very sensitive and will shut off quickly once any back pressure from the vapors are experienced.
Diagnose 1st, never be a parts changer!

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