on just about every vehicle ive ever put gas in, when i go to fill up, i open the tank and the tank hisses when i open it, Except for my Dakota and my dads Festiva, and his car smells like gas inside of it, so i suspect a fill/vent tube or even the fuel pump access seal is damaged....

But with my Dakota, i took the bed off, looked for any visible damage, couldnt find any, And then i figured if its leaking, and i blow air into the tank, will it leak... i blew air into the tank until i couldnt push anymore air into it, i dont suspect it to be leaking, But i am losing gas while the truck is parked and completely off....

Any ideas??? 1998 Dakota 2.5 / 5 speed

 

If you did have a fuel system air leak it would toss a code on you.

The system is solid lines if I remember correctly and the line is under high pressure for the fuel injection directly from the tank.


Check every inch of solid line for a pin hole or smaller hole but under the pressure its in a running state you should see the leak

You have a locking gas cap if no you may have gas thief's stealing your gas

 

My gas cap usually hiss at me till this last week or two no hissing makes me worry something is wrong but no warning light yet

 

Mine will his randomly too, especially on hotter days.

 

mine has YET to do so, and a guy that does body work has an 04 Durango and he says his tank never hisses either.. then we walked over to a dodge ram that had a little gas and just stopped from a long trip, checked it too, no hissing at all when we opened the tank, He thinks my gauge is messed up


For the way i drive and how under-powered this 2.5 Dakota is, i may be looking into a v8 model, ive put over 1500 miles since the rebuild, and the Engine runs PERFECT, has yet to give me an issue, i have Two codes on, one for the power steering and another one which is something about the A/C Clutch