How-To: 15.6 Gallons into Eco MT Tank

Go back to COMG- The Cruze Owner's Maintenance Guide


Here's the definitive way to properly increase your tank capacity from 12.x gallons to 15.x gallons.

First, get the fuel pump module from any 1.4L Cruze as long as it's NOT the ECO M6.

Next step is to release pressure in your fuel lines. I just pushed in the schrader valve that's on the fuel rail and had a rag handy to catch the fuel. After that remove the fuel tank. To do this you have to remove all the ECO specific underbody cladding. There's 3 pieces. 2 that run the length of the car and 1 smaller one that runs side to side by the fuel tank. They're easy to remove, just a bunch of 10mm plastic nuts and 2 10mm bolts.

After those are out of the way I lowered the rear section of exhaust by unbolting it right behind the catalytic converter. Just 2 13mm nuts and it'll lower enough for the tank to clear.

Disconnect the fuel filler hose at the tank, vent tube that's right next to it, main fuel line and vent line next to that.

There are 4 electrical connectors to unplug. 1 is on the vapor canister and this one is the hardest one due to lack of space. 1 is on the fuel line, 2 are on top of the fuel pump module. The only way to get to them is to lower the tank. To lower the tank you just unbolt the 2 straps that hold the tank in. 13mm bolts. I bent them down and out of the way. They're easy to bend and bend back without any damage. The only other way to do this without bending them is to remove the rear axle beam.....you decide. )

After you're sure all wires and tubes are unplugged lower the tank and slide it out the passenger side. Mine only had a few gallons in it so it was pretty light. DO not do this unless your tank is almost empty.

Once the tanks out and on the ground on top of the fuel pump module there are 2 tubes to unplug.

After that the locking ring is un-done with a punch and hammer. Just tap the tabs counter clockwise and it'll come right off. Once that's off the module just lifts right out.

Put the new one in and everything is reverse order to put it back together.

Enjoy your higher capacity!

Here's some pictures.

Fuel tank out of the car:



ECO M6 12.x gal on left, ECO A6 15.x gal on right:



Here's what it looks like with the tank removed. You can see the straps I'm talking about here:



Exhaust unbolted here to allow it to drop down enough for the tank to clear:



My tank had about 3 gallons in it when I swapped out the modules, here's filling the tank with the nozzle on full throttle after it shut off by itself:



Here's my gauge showing full WITHOUT trickle filling: