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Here we install a Tanks Inc high performance in tank fuel pump in our '64 Chevelle gas tank.  The unit is their part number PA-4 using a 250 liter per hour Walbro pump. This should be more than enough to feed the modified LS-1 we are installing.  Since we are also installing a Haneline Dash with branded Stewart-Warner gauges, we had to install a new sending unit.  Note how convenient the sending unit fit the original sending unit/pick up tube flange on front of the tank.  <Disclaimer: Working on a gas tank is extremely dangerous and the procedures used in this how-to may or may not be sufficient for your application>

We recommend an in tank fuel pump whenever possible.  External / frame rail mounted pumps will work but there is a good chance that you will encounter cavitation under certain driving conditions.  Cavitation is when the pump sucks air instead of fuel.  This air is delivered the the fuel rail and ultimately the injectors, causing hesitation.

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Here is the Tanks Inc kit. It comes with all the hardware, fuel pump and anti-slosh tray which is critical to prevent cavitation.

Here is the old sending unit and pick up tube, along with the new sending unit from Haneline.

Once we completely drained the tank and washed it out with soap and water, we put a vacuum on it with a shop vac.

Using the inner flange from the Tanks kit, we scribed where to mount the bulkhead of the fuel pump.

We just happened to have the right size hole drill (4.5") to do the job. This saved a lot of time. A jig saw would have done the job as well.

We marked and drilled all the individual mounting holes.

We then began assembling the fuel pump assembly. The directions are very straight forward.

Assembly is complete. We managed to get the height down to about 6.5 inches, which is all we had height-wise in the stock tank.

Once you insert the retaining ring on the inside, locate the cork gasket and install the assembly. Thread and tighten the retaining bolts.

Here's where our sending unit now fits. It just so happened that the mounting flange was the right size fit the existing sending unit hole.

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