I have a 78 280Z that I bought about 5 months ago. I noticed in the owners manual it says the fuel tank capacity is 17 gals. I let the fuel run down until the fuel light comes on steady (bad idea, i know!). When I refill I can only get about 13.5 to 14 gals in. Is there something wrong with my tank? Something in there or is the gage just screwed up? How do I check? It's a minor problem but kind of annoying.

 

the fuel tank probably has 3 gal unusable in it

72 240Z restoring
72 240Z RB25DET Conversion
78 260Z 2+2 Daily Driver

 

plus a gauge error .. common to early gauges ...when you go around corners it makes a difference too

72 240Z restoring
72 240Z RB25DET Conversion
78 260Z 2+2 Daily Driver

 

should I throw some Dri-Gas in it just to be sure? I assume that won't damage the fuel susyem in any way.

 

i have no idea what that is ....

how about when ur fuel light comes on ... go get petrol ?

72 240Z restoring
72 240Z RB25DET Conversion
78 260Z 2+2 Daily Driver

 

Dri-Gas is suppose to get rid of water in your fuel tank. I'm assuming that the "unusable" in my tank is water.

When the light comes on I fill up the tank but only get 13.5 gallons in instead of the listed 17.

 

no in your tank there is a certain amount of fuel that cannot be sucked out of it

72 240Z restoring
72 240Z RB25DET Conversion
78 260Z 2+2 Daily Driver