What would make my fuel gauge on a 1997 Astro van read full most of the time but never get below seven eights of a tank no matter how much fuel is in it?

Mine does, too.. Annoying.

Let me guess, the gauge vibrated for a while and now it's not working at all. Replace the fuel pump sending unit.

The sending unit is probably bad, not unusual.

That is the temp. Gauge sending unit.

Winchester did not make a shotgun chambered in 25 gauge,as a matter of fact there has never been a 25 gauge shotgun made.Available chamberings were 12 gauge,16 gauge,20 gauge,28 gauge,and 410 gauge.

See related links below.

need more info, engine-details- have you checked vacuum with gauge? etc.

if you are refering to the sensor for the fuel gauge, it is in the fuel tank with the fuel pump.

A rain gauge. Click on 'related links' below to go to the wiki page on rain gauge.

The Compound Gauge measures above and below atmospheric pressure (in psig and inches of mercury).

My 2000 Chev. Astro Van started doing the same thing and it ended up being the fuel pump! It did that for about 7 months before it went out.

Top rear of the engine next to the distributor.

Follow the wire from your gauge and you'll find it's grounded at some point, this is the only reason a gauge will peg. (This is also a great way of testing any gauge, ground it and if the gauge pegs it's good, if it doesn't it's bad)

A radius gauge takes the guesswork out of designing or duplicating a part, no matter what size. Arc Master Radius Gauges

The proper fuel pressure of a 1995 Astro van should be between 55-61 psi. Checking the fuel pressure at home requires a fuel pressure gauge and knowledge of the location of the shader valve on the fuel rail.

on the left side at the gauge light switch is a push button , push it 4 times and it should work

Connect a freon tank an gauge to the Astros low side ac port. Start the engine and open the ac to high. Open the freon tank and fill the system till the gauge shows full.

If your gauge cluster has a tachometer: The "Check engine" light is under the tachometer just below the "1000." If your gauge cluster does not have a tachometer: The "Check engine" light is below the fuel gauge, just to the left of the high-beam headlight indicator.

On the dash, right below the temperature gauge.

Replace your engine and transmission grounds.

see link below for help Good Luck

Looking from the rear of the gauge apply +12v to right terminal and ground to left terminal. If functional the gauge will go to full. Reverse wires and the gauge should go to the left below empty. If it does these two things the gauge is working and the problem is wiring or sending unit. Randy Nix

The fuel sending unit is the most likely cause. The wiring to the unit can go bad or the unit itself fails.

The float is located inside the gas tank. It moves up and down with the fluid level to signal your gas gauge how much fuel is left in the tank.

The difference between 18 gauge and 22 gauge stainless steel is the thickness. The 18 gauge is 0.050" thick, and the 22 gauge is 0.031" thick. A link is provided below to an article with a list of the conversions. You'll note that the cited thickness for the gauges of stainless do not apply to galvanized steel, aluminum, zinc, brass or other metals.