Question about 1988 Ford F 150

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Fuel tank shuttle valve - 1988 Ford F 150

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Posted on Jan 02, 2017

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SOURCE: fuel gauge not working

yea fords with two tanks are known for getting stuck if you dont switch the tank constantly. you have to get to the valve that switches the two tanks, and free it up. it definitley isnt anything but the valve.

Posted on Apr 01, 2009

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Have water in fuel Suzuki xl7 how do I drain the tank

no year, huh? some years have a check valve , there,....
this forum is for usa cars, is car USA car?
the tanks just dont like siphoning. (check valve)
the FSM covers this , in the fuel section under bad pump.
1998 to 2006, ill guess, 06

i have the FSM and does not cover. bad fuel, no drain plug.

it shows how to get fuel lower, in filler neck
the tank has check valve at it its metal neck.
so inserting a hose in filler, will hit this check valve.
and all you get out , is 1/2 fuel.
id use the tank out procedure.
then empty all fuel, after step 5.
  1. Disconnect the negative battery cable.
  2. Relieve fuel pressure in fuel feed line.
  3. Due to absence of fuel tank drain plug, drain fuel tank by pumping fuel out through fuel tank filler.
  4. Use hand operated pump device to drain fuel tank.
  5. Remove fuel tank.

tip tank to drain the remainder. out

here is one more way. (IDEA!)
do 1-4
then tip car to left. Jacks then stands at frame.
then remove the filler hose on tank
remove that pesky check valve. from neck last.

and pump out the rest.

Mar 01, 2015 | Suzuki XL7 Cars & Trucks

1 Answer

Fuel runs from back tank to front sometimes

If your driving a ford truck the fuel pump assy that is in the tank that is recieving the gas is leaking and allowing fuel to enter. Ford uses a valve in the fuel pump assy that is activated when fuel pressure is applied to it and it opens a port and allows the excess fuel to return back to the tank. They do not use a switching valve between tanks just whichever pump is activated allows fuel to return to that tank. When this valve fails fuel is returned to this tank all the time, pumping it from one tank to the other.
If you dont have a Ford the switching valve assy. is probably faulty.

Jul 14, 2012 | Cars & Trucks

1 Answer

I have a 1995 f25,the back fuel tank doesnt work and the front tank drains intp the rear..what should i do

the fuel tank switch valve is bad. It is pumping fuel to the other tank instead of the engine. There was a recall for some models in 1989-91. I think you need a selector valve, just my guess.

here is some of what it says:

Your truck is equipped with a dual fuel tank selector valve which is designed to direct fuel to the engine from one fuel tank and returns unused fuel to the same tank. It is possible that the dual fuel tank selector valve on your truck could leak internally and as a result return a portion of the unused fuel to the tank other than from which it was drawn. Should this occur when the other tank is at full capacity, fuel could flow out the filler pipe of the tank past the cap. Fuel spillage in the presence of an ignition source, presents the potential for a vehicle fire.

Dec 18, 2010 | 1995 Ford F250

1 Answer

I have no gas running to the engine from the front tank, and apparently have gas filling into the front tank from the rear tank. I can only use the rear tank. The switch is set for the rear tank and when I...

I have had the exact problem on my ford truck, and fixed it. There is a tank feed shuttle valve mounted to the drivers side frame rail that is the most likely suspect. It operates by fuel pressure and when it fails, it fails so the front tank doesnt work.

It is worth mentioning that there are three fuel pumps on your truck, each fuel tank has a small low pressure pump inside the tank, and there is a high pressure pump located on the drivers side frame rail too, just before the fuel filter.

The front in the tank pump could be bad, too, but most likely the shuttle valve is the problem.

Oct 13, 2010 | Ford F-150 Cars & Trucks

1 Answer

I have a 1995 ford 4x4 with the 4.9 6 cyl. I have a problem with fuel delivery from the front tank.The truck idles real ruff when starting from the front tank but the not the rear tank.The problem with the...

You might have two seperate problems:

If fuel is draining from the rear tank to the front, there is a tank shuttle valve located on the drivers side frame rail that is the most likely suspect to fix that.
It costs around $120 or so, and when it fails, you get that siphoning going on, and often the front tank wont pump at all.
In your case, if the engine is running rough off the front tank, you might have another issue, such as a bad in tank fuel pump, but the shuttle valve needs changed first , so maybe it might fix the other problem too!

Apr 21, 2010 | 1995 Ford F150 Styleside Regular Cab

1 Answer

I have a 1991 ford f-150 xlt.I put a used battery in truck and let it charge up.It ran aprx 30mins and it ran out of gas. Put gas in it and tried to start it and now it will not start.Both fuel pumps are...

If you have dual tanks, like I have, the there is a mechanical fuel selector valve that both tanks hook to. When it fails, it usually fails so you can't get fuel out of the front tank. If you haven't tried yet, put some fuel in the back tank and give it a try. If the truck runs again, you need to swap out the shuttle valve.

Oct 30, 2009 | 1991 Ford F150

2 Answers

1985 classC 350 econoline motorhome

Either the fuel line from the front tank to the switching valve is plugged or kinked, or the valve is not moving all the way to that tank (if electrically switched). Pull the hose (from that tank) off at the valve--do you get good fuel flow? If the front tank is lower than the valve, try switching the fuel lines from the two tanks at the valve, and set the switch for the rear tank. If it now runs, clean the valve or replace it.

Aug 08, 2009 | 1985 Ford Econoline

1 Answer

My 2000 Hyndai Accent would only accept fuel at a very slow rate. If you tried to hold the fuel nozzle at half way, the fuel pump would click off as if the vehicle was full. it would accept maybe 10-20...

Power Stage (DMTL Motor)

Power Stage (DMTL Valve)

The 2000 model year Accent adopts a new "pressurized" leak check system capable of detecting a 0.020" (0.5 mm) diameter leak (previous Hyundai systems detect a 0.040" [1mm] diameter leak using engine vacuum). The new system uses a Diagnostic Module for Tank Leakage (DM-TL) to close and pressurize the fuel evaporative emissions system. The DM-TL replaces the fuel tank pressure sensor and the canister close valve from previous systems. Other significant changes were made to the system logic, including several new diagnostic trouble codes. The diagnostic module (refer to photos on page 3) consists of a motorized air pump, a solenoid shuttle (sealing) valve, and a 0.020" (0.5 mm) diameter reference orifice. After the vehicle meets the self check requirements (see Self Check Requirements When Not Using The Hi-Scan Pro Section), the DM-TL activates to check for system leakage. The air pump and shuttle valve work on the command of the ECM. Motorized Air Pump - the pump pressurizes the evaporative emissions system producing a current draw that the ECM reads to determine pass/fail conditions. When the pump is switched 'ON', current draw is typically 17 - 36 mA. Solenoid Shuttle Valve - the shuttle (sealing) valve has two sealing sides (front and rear) that provide two functions: A. When the valve is "OFF" (no voltage aplied to valve), the front sealing surface directs air from the air pump (if it is "ON") through the 0.020" (0.5mm) diameter reference orifice. The rear sealing surface is openand provides an open path between the charcoal canister and freshair. B. When the valve is "ON" the front sealing surface is open directing air from the air pump into the evaporative emissions system. The rear sealing surface is closed, sealing off the evaporative emission system for the leak check. 0.020" (0.5 mm) Diameter Reference Orifice - the built-in reference orifice provides the ECM the current draw of the air pump motor for current ambient conditions (temperature,humidity etc.) to determine pass/fail conditions duringthe system leak check. 1fc9b8a.gif P1402 DM-TL Circuit Continuity Check (Pump Motor) - short circuited, or disconnected. P1403 DM-TL Circuit Continuity Check (Shuttle Valve) - short circuited, or disconnected. IMPORTANT NOTE!.. you have a fuel leak now. These codes are NOT a direct cause of that leak... they are a result.

2c775b4.gif It is highly recommended to use the Hyundai Hi-Scan Pro to activate the evaporative emission self check. Using theHi-Scan Pro will save time and provide more consistent results. Moreover, "road testing" of the evaporative emission system in a 2000 MY Accent is not practical (requiring up to a 4day time frame to verify a repair). The leakage self check can be found on the main menu after selecting Model and Year of the vehicle. For the 2000 Accent, the menu item is labeled "DM-TL Test". To familarize yourself with the operation of the self check, remove the fuel cap of a 2000 Accent that is operating properly and activate the self check (follow the instructions on the Hi-ScanPro screen). With the fuel cap removed, Diagnostic Trouble CodeP0455, or P0442 will register in the ECM memory after the test is finished. (NOTE: The "Check Engine" light will not illuminate because the self check has only been run once. However, the code will be stored in the ECM memory. The "Check Engine" light will illuminate if the ignition key is switched to off, and the main power relay shuts off, and then the self check is performeda second time.). Erase the code when finished, and securely replace the fuel cap. If no code appears, turn the ignition key to off until the main power relay shuts off and retry the process. If no code appears at this point, call the Hyundai Tech Line. 7. SYSTEM SELF CHECK REQUIREMENTS (WHEN NOT ACTIVATED BY HI-SCAN PRO) For verification of a repair, it is highly recommended to use the Hi-Scan Pro to activate the self check. The importance of using the Hi-Scan Pro can't be over-emphasized because of the different self check requirements for the 2000 Accent. Use of the Hi-Scan Pro bypasses all of the self check criteria described below, allowing the technician to perform the self check at anytime, regardless of the conditions. Under normal operating conditions, the leak check occurs almost immediately after the vehicle is shut off and items 1-8 have been achieved. The ECM"s prerequisite for this check areas follows:
  1. Vehicle must have cooled down (not driven) a minimum of 5 hours (typically overnight).
  2. Vehicle must have been driven 20 minutes or more.
  3. Engine "off" and ignition key "off".
  4. Vehicle"s fuel level must be between 15% - 85% full.
  5. Ambient temperature between 39ðF - 95ðF (4ð - 35ðC).
  6. Altitude lower than 8250 feet (2500 m).
  7. Battery Voltage between 11.5 - 14.5 volts.
  8. Activates every other time (every second time) after conditions 1-7 are met.
NOTE The leak check will occur regardless of fuel level when conditions 1-7 are met, if the ECM has stored a DTC for the fuellevel sensor (P0460; Fuel Level Sensor Rationality Check).

Jun 25, 2009 | Hyundai Accent Cars & Trucks

1 Answer

Fuel gauge not working

yea fords with two tanks are known for getting stuck if you dont switch the tank constantly. you have to get to the valve that switches the two tanks, and free it up. it definitley isnt anything but the valve.

Mar 31, 2009 | 1988 Ford F 150

1 Answer

I have a 1988 F-150 p/u with dual tanks.fuel gauge on both tanks do not work. one reads below empty all the time the other reads above full all the time.

i have the same problem and i replaced the shuttle valve and i fixed the problem it is located on the drivers side frame rail just behind the the main high pressure fuel pump it should have 6 lines going into it and out it is a mechanical part so its not repairiable hope this helps

Jul 20, 2008 | 1988 Ford F 150

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