I have a 97 Chevy Tahoe 4x4 350 vortech, what wrench size do u use to take off my fuel filter ,that is the line going in.?

The pump is electric, and it is inside the gas tank. You have to drop and remove the tank to change the pump.
The filter is a small metal cylinder, about fist size, and will be in the fuel line under one side or another of the car, unless it is in the engine bay, just before the fuel line reaches the engine. I expect it would however be underneath, along a frame rail. Just follow the fuel line from the tank. Both ends of the filter are threaded. Use 2 wrenches, one as a back-up while you loosen the fuel line fitting. Be careful of damaging the end of the fuel line-that is why you want 2 wrenches.

!6 mm on the fuel line and 20mm on the filter.

Follow the steps care fully

Open the hood and relieve the fuel system pressure. On the fuel rail, right before the first fuel injector, locate the Schrader valve-similar to a tire air valve-on the inlet fuel line. Using a small screwdriver, depress the stem inside the valve while covering the valve with a shop rag to catch the squirt of fuel.

Raise the back of the vehicle using a floor jack and support it safely on jack stands.

Locate the fuel filter along the frame rail-passenger side-of the vehicle, near the fuel tank.

Unplug the quick-connect fuel inlet line on the back of the filter by pressing the lock tabs. Push the connector towards the filter and then pull to disconnect the fuel supply line.

Disconnect the outlet fuel line from the filter-the line going toward the engine-by using a backup wrench to hold the line nut while disconnecting the lock nut on the filter with a tube wrench.

Remove the filter from its mounting bracket and install the new filter in place, making sure the arrow on the side of the filter case points toward the engine.

Install the outlet fuel line. Tight the lock nut finger tight, then hold the fuel line nut with the backup wrench and tight the lock nut with the tube wrench. Make sure not to over tighten the nut to prevent fuel leaks.

Press the fuel supply line fitting against the small tube at the back of the filter until the lock tabs snap in place.

Lower the vehicle, start the engine and check for leaks.

use any piece of metal tubing of proper size, but first check for fuel and pressure at the relief valve on the fuel injector rail and Do you hear the fuel pump in the tank running?

It's attached to the frame underneath,right about where the driver's door ends,or slightly farther back.
If you're going to change it,first soak the fittings with some brand of penetrating oil,even WD40 if that's all you have. You need 2 wrenches on each end,probably 5/8 and or 9/16 (16mm & 14mm roughly) and try your best not to twist the fuel lines,rusty or not. They twist pretty easy that's why there are 2 wrench fittings on each end.
Good or bad,please rate my post?
Bob

Check your fuel pump they usually go out after 10 yrs or so. Also check your fuel filter. Both easy fixes.

Good Luck!

the fuel filter is located down under the middle of the frame rail, on the drivers side,remove the lines from the filter, look out b/c some fuel will come out after diconecting the line. replace with the new filter make sure you get the "FLOW" "should be marked on the filter" pointing to the front of the car

hi go to tank and follow lines to the fuel filter

First contact your dealer as Ford has a recall on that year model fuel filter, it is an inline tyep on the frame rail that requires wrenches to replace. You can get them at any parts house but check with your dealer about the recall first, might get for for free!

before you drop tank again, check fuses & relay.then disconnect fuel line @ filter turn key to on position should hear fuel pump run and get gas stream out of line. if no flow from line new pump faulty be sure & remove negative battery cable first good luck.