How big is my gas tank? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

JHT67 · 10-06-2010, 02:14 PM

I have an all stock 85' lwb, my gas gage isn't working right, and I'm wanting to keep track of my mileage before I run it out of gas. Also since I'm on the subject, I'm getting about 12 miles to the gallon with the old 305, is there much improvement there?

Prerunner1982 · 10-06-2010, 02:20 PM

It will either be a 16 or a 20 gallon tank. As far as the MPG... I was only getting 16mpg out of my 87 GMC with a TBI 305 and 700R4 (Overdrive trans).

Per LMC the shortbed had the 16 gal and the longbed had the 20 gal. Though it has been awhile since I have looked at my 82 I believe it had dual 16 gal tanks and it was a longbed, I think my 87 GMC was the same way.

Matt Man · 10-06-2010, 02:23 PM

x2 on the tank options, but yea these things are not built for mileage, i would suggest a tune up spark plugs,wires,cap&rotor, oil change, air up all the tires, and most importantly your driving style has the most to do with it imo.

RandyP · 10-06-2010, 02:26 PM

14x42.25x11 is 16 gallon, 14x56x11 is 20 gallon. A 20 gallon tank on a LWB would go a lot closer to the rear wheel opening in the bedside. A 16 gallon on a LWB has a lot of room between the end of the tank and the wheel opening.

JHT67 · 10-06-2010, 02:26 PM

Looks like I'll be playing it sake and filling up every 150 miles. Mine has no overdrive, so I guess I'm just about right.

I really just need to get the gas gage fixed, I'm too lazy to have to keep track this way

JHT67 · 10-06-2010, 02:29 PM

OK, now I need to get the tape measure and have a look, thanks guys.

10-06-2010, 02:14 PM	#1
JHT67 Registered User Join Date: Jan 2010 Location: columbus, ohio Posts: 972	How big is my gas tank? I have an all stock 85' lwb, my gas gage isn't working right, and I'm wanting to keep track of my mileage before I run it out of gas. Also since I'm on the subject, I'm getting about 12 miles to the gallon with the old 305, is there much improvement there?

10-06-2010, 02:20 PM	#2
Prerunner1982 Registered User Join Date: Oct 2002 Location: Edmond, OK Posts: 5,904	Re: How big is my gas tank? It will either be a 16 or a 20 gallon tank. As far as the MPG... I was only getting 16mpg out of my 87 GMC with a TBI 305 and 700R4 (Overdrive trans). Per LMC the shortbed had the 16 gal and the longbed had the 20 gal. Though it has been awhile since I have looked at my 82 I believe it had dual 16 gal tanks and it was a longbed, I think my 87 GMC was the same way. __________________ Jon 1982 Chevy Silverado 350/th350.... RETIRED 1993 Jeep XJ 2 door(Cherokee) 4wd 4.0ltr/AX-15 (5spd)/NP231 .... Oklahoma Roll Call Last edited by Prerunner1982; 10-06-2010 at 02:24 PM.

10-06-2010, 02:23 PM	#3
Matt Man Registered User Join Date: Oct 2009 Location: Buhl, Idaho Posts: 1,438	Re: How big is my gas tank? x2 on the tank options, but yea these things are not built for mileage, i would suggest a tune up spark plugs,wires,cap&rotor, oil change, air up all the tires, and most importantly your driving style has the most to do with it imo. __________________ 86 c30 crew cab dually 454/400 4/6 drop SOLD 1-8-11 1981 chevy K10 short Bed Scottsdale SOLD 10-26-2020 67 GMC Stepside Straight six/3 on the tree "The Peach" 2020 Silverado Double Cab LT Z71 5.3 8 speed Daily Driver K10 build http://67-72chevytrucks.com/vboard/s...d.php?t=671934 The Peach build http://67-72chevytrucks.com/vboard/s...d.php?t=733903

10-06-2010, 02:26 PM	#4
RandyP Getting Old; Going Broke Join Date: Apr 2010 Location: Owasso OK Posts: 2,764	Re: How big is my gas tank? 14x42.25x11 is 16 gallon, 14x56x11 is 20 gallon. A 20 gallon tank on a LWB would go a lot closer to the rear wheel opening in the bedside. A 16 gallon on a LWB has a lot of room between the end of the tank and the wheel opening. __________________ *Why is every used 350 sbc out of a corvette?* There's only two things that excite a man, expensive toys and real expensive toys. *VEGETARIAN: That's an old Indian word meaning "I don't hunt so good."* When the going gets tough, switch to power tools.

10-06-2010, 02:26 PM	#5
JHT67 Registered User Join Date: Jan 2010 Location: columbus, ohio Posts: 972	Re: How big is my gas tank? Looks like I'll be playing it sake and filling up every 150 miles. Mine has no overdrive, so I guess I'm just about right. I really just need to get the gas gage fixed, I'm too lazy to have to keep track this way

10-06-2010, 02:29 PM	#6
JHT67 Registered User Join Date: Jan 2010 Location: columbus, ohio Posts: 972	Re: How big is my gas tank? OK, now I need to get the tape measure and have a look, thanks guys.



Register or Log In To remove these advertisements.

Register or Log In To remove these advertisements.