Tank you - ASUS P5L-MX Motherboard

The black reservoir/fuel tank selector unit you are referring to is the fuel tank switching valve, which is designed to switch between the two fuel tanks in your 1988 Ford Ranger XLT 4X4. This valve is responsible for directing fuel from the selected tank to the fuel pump and engine.
The second fuel tank selector unit you mentioned (part number 5sv2k) is likely a replacement part for the original fuel tank selector unit. It is not intended to replace the fuel tank switching valve.
The dual fuel tank system in your Ford Ranger requires both the fuel tank switching valve and the fuel tank selector unit to function properly. The fuel tank selector unit allows the driver to switch between the two fuel tanks, while the fuel tank switching valve directs fuel from the selected tank to the fuel pump and engine.
If the black fuel tank switching valve is leaking or malfunctioning, it should be replaced to ensure proper operation of your dual fuel tank system.

check installation of the tanks
if you have a balance tube between the tanks then the higher tank bottom will flow to the lower tank
if it is a diesel operation and you have put in the extra tank then where the injector return flows back to which tank will determine which tank fills up first. it will work like this fuel out to the injectors is used partially to run the engine but the most part is used to cool the injectors and so the hot fuel goes back to a tank
if that is not the same tank from which fuel is being drawn then what you have is a situation where the fuel pump is pumping from one tank and returning excess unused fuel to the other

windshield washer tank, steering fluid tank, anti freeze tank, freon tank, gas tank, brake fluid tank.... You dont specify what kind of tank.

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IS PROPANE TANK RESIGNED TO BE MOUNTED VERTICAL OR HORIZONTAL? The Outflow tube of the vertically mounted tank runs to within an inch of the bottom of the tank. The horizontally mounted Tank Design has an outflow tube that has a 90 degree bend half way down to 1" of the side of the tank if it mounted in the wrong orientation for it's design, it stops picking up LPG halfway down. When used in it's proper application, the orientation would be correct for gas pickup. A tank designed for horizontal mounting used in a verticle position picks up LPG for half of the tank, then it will light (because of the fumes are flammable) but do not posses the density to heat. (Too much Air) in the mixture fuel to air ratio. We found this out after pulling the shut off valve off of a tank with same problem. It was a horzontal tank used in a verticle positiuon. It worked for half a tank of fuel.

If fuel injected. the tank selector valve switches both the suction line from the tank and the return line back to the tank. It sounds like you have a stuck or bad tank selector valve if the return is not being ported back to the rear tank.

Fuel Tank Assembly Removal & Installation Single Tank To Remove:

1. Before servicing the vehicle refer to the precautions at the beginning of this section
2. Relieve fuel system pressure (See: Fuel System Relieving)
3. Disconnect the negative battery cable
4. Raise and support the vehicle
5. Drain the fuel tank in an approved container
6. Remove or disconnect the following:
   • evaporative emission (EVAP) canister Disconnect fuel lines for single tank
     
     
   • Chassis fuel lines (B) at the fuel tank (A)
     1. Cap the fuel and EVAP lines to prevent possible fuel system contamination
     Disconnect EVAP vent line
     
     
   • EVAP vent line at the fuel tank clip (E) Disconnect vent hose and filler hose
     
     
   • Vent hose and filler hose clamp (D, B)
   • Vent hose and filler hose from the line
   Fuel tank removal
   
   
7. With the aid of an assistant or a suitable jack support the fuel tank
8. Remove or disconnect the following:
   • Fuel tank strap attaching bolts
   • Fuel tank straps
9. Carefully lower the rear of the fuel tank slightly
10. Remove or disconnect the following:
    • Fuel sender cover Fuel tank connections
      
      
    • Fuel sender and the fuel pressure sensor electrical connectors
    • Fuel tank
11. Place the fuel tank in a suitable work area Fuel lines at the tank
    
    
12. Remove or disconnect the following:
    • Fuel feed and return lines (C) from the fuel sender and the retaining clips
    • Fuel pump assembly from the fuel tank
    • EVAP line from the fuel tank roll over valves (B, D) and the retaining clips (A)
    • Fuel fill hose and the vent hose from the fuel tank
    • Fuel tank

To Install:

1. Install or connect the following:
   • EVAP line to the fuel tank roll over valves and the retaining clips
   • Fuel pump assembly to the fuel tank
   • Fuel feed and return lines to the fuel sender and the retaining clips
   • Fuel fill hose and the vent hose to the fuel tank; torque hose clamps,
     1. Torque to: 22 lb-in. (2.5 Nm)
2. With the aid of an assistant or a suitable jack support and partially raise the fuel tank front end first
3. Install or connect the following:
   • Fuel sender and the fuel pressure sensor electrical connectors
   • Fuel sender cover
4. Fully raise the fuel tank
5. Install or connect the following:
   • Fuel tank straps
   • Install the fuel tank strap attaching bolts;
     1. Torque to 30 lb-ft. (40 Nm)
   • Fuel fill hose and the vent hose to the lines;
     1. Torque hose clamp to 22 lb-in. (2.5 Nm)
6. Torque the vent hose clamp,
   • Torque to: 22 lb-in. (2.5 Nm)
7. Connect the EVAP vent line to the fuel tank clip
8. Remove the caps from the fuel and EVAP lines
9. Install or connect the following:
   • chassis fuel lines at the fuel tank
   • EVAP canister
10. Lower the vehicle to the ground
11. Fill the fuel tank with clean fuel
12. Install the fuel filler cap
13. Connect the negative battery cable
14. Use the following procedure to inspect for leaks:
    • Turn the ignition on for two seconds
    • Turn the ignition off for 10 seconds
    • Turn the ignition on
    • Inspect for fuel leaks
15. Install the engine sight shield
16. Road test the vehicle to check performance

Usually there is no access under the rear seat for safety reasons. Fuel Tank Removal & Installation 2002-2004 To Remove:

1. Relieve the pressure in the fuel system.
2. Lift the vehicle.
3. Remove the frame brace from the frame.
4. Remove the fuel tank shield from the fuel tank.
5. Drain the fuel from the tank into an approved container.
6. Loosen the fuel hose clamp and disconnect the hose from the fuel tank.
7. Disconnect the evaporative emission (EVAP) vent valve and fuel tank pressure sensor connectors. Evaporative emission cansister pipes removal and installation
   
   
8. Disconnect the evaporative emission (EVAP) vapor and vent valve pipes from the evaporative emission (EVAP) canister.
9. Disconnect the fuel return and feed pipes from the fuel tank.
10. To avoid system contamination, cap the evaporative emission (EVAP) and fuel pipes.
11. Use a jack to support the fuel tank. Fuel tank removal and installation
    
    
12. Detach the fuel tank straps from the frame.
13. Lower the fuel tank.
14. Disconnect the fuel sender connector.
15. Remove the fuel tank from the vehicle.

To Install:

1. Place the fuel tank under the vehicle.
2. Connect the fuel sender connector.
3. Attach the fuel tank straps to the frame. Torque the bolts to 24 ft-lb (32 Nm).
4. Remove the caps from the evaporative emission (EVAP) and fuel pipes.
5. Connect the evaporative emission (EVAP) vapor and vent valve pipes to the evaporative emission (EVAP) canister.
6. Connect the evaporative emission (EVAP) vent valve and fuel tank pressure sensor connectors.
7. Connect the fuel hose to the fuel tank. Torque the clamp to 22 in-lb (2.5 Nm).
8. Connect the fuel return and feed pipes to the fuel tank.
9. Lower the vehicle.
10. Refill the fuel tank.
11. Turn on the ignition for 2 seconds, with the engine off, and then turn off the ignition. After 10 seconds, turn the ignition back on with the engine off.
12. Lift the vehicle.
13. Check for leaks in the fuel lines.
14. Install the fuel tank shield onto the fuel tank.
15. Install the frame brace onto the frame.
16. Lower the vehicle.

2005-2007 To Remove:

1. Relieve the pressure in the fuel system.
2. Lift the vehicle.
3. Remove the frame brace from the frame.
4. Remove the fuel tank shield from the fuel tank.
5. Drain the fuel from the tank into an approved container. Evaporative emission cansister pipes removal and installation
   
   
6. Disconnect the evaporative emission (EVAP) canister fresh air, solenoid, and purge pipes from the evaporative emission (EVAP) canister.
7. Disconnect the fuel filler pipe recirculation hose from the fuel tank.
8. Loosen the fuel fill pipe clamp and disconnect the pipe from the fuel tank.
9. Disconnect the fuel feed and evaporative emission (EVAP) pipes from the fuel tank.
10. To avoid system contamination, cap the pipes.
11. Use a jack to support the fuel tank. Fuel tank removal and installation
    
    
12. Detach the fuel tank straps from the frame.
13. Lower the fuel tank.
14. Disconnect the evaporative emission (EVAP) vent valve, fuel tank pressure sensor, and fuel sender connectors.
15. Remove the fuel tank from the vehicle.

To Install:

1. Place the fuel tank under the vehicle.
2. Connect the evaporative emission (EVAP) vent valve, fuel tank pressure sensor, and fuel sender connectors.
3. Lift the fuel tank.
4. Attach the fuel tank straps to the frame. Torque the screws to 24 ft-lb (32 Nm).
5. Remove the caps from the pipes.
6. Connect the fuel feed and evaporative emission (EVAP) pipes to the fuel tank.
7. Connect the fuel fill pipe to the fuel tank. Torque the clamp to 22 in-lb (2.5 Nm).
8. Connect the fuel filler pipe recirculation hose to the fuel tank.
9. Connect the evaporative emission (EVAP) canister fresh air, solenoid, and purge pipes to the evaporative emission (EVAP) canister.
10. Lower the vehicle.
11. Refill the fuel tank.
12. Turn on the ignition for 2 seconds, with the engine off, and then turn off the ignition. After 10 seconds, turn the ignition back on with the engine off.
13. Lift the vehicle.
14. Check for leaks in the fuel lines.
15. Install the fuel tank shield onto the fuel tank.
16. Install the frame brace onto the frame.
17. Lower the vehicle.

this is for gas tank behind axle, not in front of axle.

SECTION 310-01A: Fuel Tank and Lines—Gasoline and Diesel 1999 Econoline Workshop Manual
REMOVAL AND INSTALLATION Fuel Tank — Aft-of-Axle
Special Tool(s) Fuel Line Disconnect Tool
310-5039 (T90T-9550-5) High-Lift Transmission Jack
014-00942 or equivalent
Removal
WARNING: Do not smoke or carry lighted tobacco or open flame of any type when working on or near any fuel related component. Highly flammable mixtures are always present and may be ignited, resulting in possible personal injury.
WARNING: Fuel in the fuel system remains under high pressure even when the engine is not running. Before repairing or disconnecting any of the fuel lines or fuel system components, the fuel system pressure must be relieved to prevent accidental spraying of fuel, causing personal injury or a fire hazard.
NOTE: The 55 gallon aft-of-axle fuel tank (9002) is shown; the 35 gallon aft-of-axle fuel tank is similar.

1. Disconnect the battery ground cable.

1. Relieve the fuel pressure; refer to Section 310-00A .

1. Drain the fuel from the fuel tank; refer to Section 310-00A .

1. Raise and support the vehicle; refer to Section 100-02 .

1. NOTE: In this illustration, the vehicle body is shown removed for clarity.
   Disconnect the fuel tank filler pipe (9034) and the filler vent tube from the fuel tank.

1. Position the jack under the fuel tank.

1. Remove the 3 bolts.

1. Remove the 3 nuts.

1. Remove the fuel tank support straps (9092).

1. Partially lower the fuel tank.

1. Disconnect the fuel lines from the fuel pump (9350); refer to Section 310-00A .

1. Disconnect the fuel pump and fuel tank sending unit electrical connector.

1. On gasoline fuel tanks, disconnect the hose(s) from the evaporative emission valve (9B593).

1. On gasoline fuel tanks only, disconnect the fuel tank pressure sensor electrical connector.

1. Lower the fuel tank.

1. If the fuel tank is being replaced, transfer the fuel pump, fuel tank sending unit, the evaporative emission valves and the fuel tank pressure sensor (gasoline fuel tanks) or the plug (diesel fuel tanks) to the new fuel tank.

A scuba tank is design to hold a certain volume of air, at a particular at a particular temperature. In the US, the standard tank is an aluminum 80 CF tank. At room temperature and 3,000 psi, the tank holds 72 CF of air (yeah, I know they round up calling it 80 CF tank). When you are filling the tank, the air and tank will become warm/hot. If you check the pressure guage while the tank is warm, it will give you a reading of X. Once the tank cools, it will give you a reading that is less than X. They put the tanks in the water in the hopes of keeping the temperature do, and filling the tanks closer to the design pressure and temperature. Some examples that you can see... In Mexico, many of the tanks will be sitting in the sun while on the boat. The tank may have a reading of 3,200 psi. Once you jump in the water, and the tank cools down, the new reading may be 2,800 psi without ever breathing any of the air. I have been ice diving, the tank was acutally colder than the water. Since the water temperature was warmer than the tank, me pressure reading was slightly higher.