1987 GMC V2500 Fuel Tank Selector Switch: A Complete Guide
Having trouble with your dual fuel tanks? Your dash switch might be the culprit.
- A bad switch can cause the engine to stall, the fuel gauge to read incorrectly, or the truck to not run on one tank.
- Symptoms are similar to a bad selector valve or fuel pump, but the switch is the easiest and cheapest part to replace first.
- Ensure you buy the correct switch for a 1987 TBI (fuel-injected) model, not a carbureted one.
- Quality aftermarket brands like Standard Ignition and Rostra are reliable choices for this part.
Is Your Fuel Selector Switch Failing?
The fuel system on the 1987 V2500 is straightforward, but when the selector switch starts to go, it can cause some confusing problems. Because the switch controls the tank valve, the fuel pumps, and the gauge, a failure can show up in several ways. Ignoring these symptoms can leave you stranded, even with a full tank of gas.
Symptoms of a Bad Selector Switch
- Engine Stalls When Switching Tanks: This is the most common sign. You flip the switch, and the engine sputters and dies because it's not getting fuel from the new tank. This usually means the switch isn't successfully telling the new pump to turn on or the valve to change position.
- Fuel Gauge is Wrong or Doesn't Change: You might switch tanks, but the gauge stays on the reading from the first tank, or it may read empty or full incorrectly. This points to a failure within the switch's contacts for the gauge signal.
- Truck Won't Start on One Tank: If the truck runs fine on one tank but won't start on the other, the switch might not be sending power to that tank's fuel pump. You might not hear the fuel pump prime (a faint whirring sound) when you turn the key with the bad tank selected.
- One Tank Overflows: While often a sign of a bad selector *valve*, a faulty switch can sometimes contribute to the valve getting stuck, causing fuel to be returned to the wrong tank until it overflows.
Switch vs. Valve vs. Pump
The symptoms of a bad dash switch are very similar to a bad selector valve (located on the frame rail) or a dead in-tank fuel pump. The switch is often the easiest and cheapest part to replace, making it a good starting point for diagnosis. If a new switch doesn't fix the issue, the valve or the fuel pump for the non-working tank is the next likely problem.
Choosing the Right Aftermarket Switch
For a 1987 V2500, finding a brand-new OEM switch from GM is nearly impossible. The aftermarket is your best and only real option. Luckily, these switches are simple and have been reproduced by reliable companies. They are designed to be exact replacements for the original.
| Brand Tier | Available Brands | Typical Price | Our Take |
|---|---|---|---|
| Premium Aftermarket | Standard Ignition (SMP) | $28 - $31 | Standard is a well-known brand that manufactures parts for both OEM and the aftermarket. They have a reputation for quality control and making parts that fit and function like the original. This is a solid choice for reliability. |
| Quality Aftermarket | Rostra Powertrain | $25 - $29 | Rostra is a certified OE supplier for some major automakers and produces a wide range of electronic parts. Their components are known to be good quality and reliable, making them a dependable option. |
| Value / Economy | Replacement | $20 - $24 | This is a budget-friendly option. It will get the job done and is a good choice if cost is your main concern. Quality can be more variable than with the premium brands, but for a simple switch, it's often sufficient. |
Check Your Engine Type
The 1987 model year was a transition for GM trucks. Make sure you get the switch for a fuel-injected (TBI) engine, not a carbureted one. The TBI switch is a simple up/down rocker switch and is different internally from the switch used on older, carbureted trucks.
Frequently Asked Questions (FAQ)
Is it hard to replace the fuel tank selector switch?
No, this is a very easy job. You will need to carefully remove the plastic dash bezel that surrounds the instrument cluster and radio. The switch is held in by clips. You just unplug the wiring connector from the back, squeeze the clips, push the old switch out, and snap the new one in. The whole process usually takes less than 30 minutes.
I replaced the switch, but it still won't switch to my other tank. What now?
If a new switch doesn't solve the problem, the next most likely culprits are the fuel tank selector valve or the fuel pump in the tank that isn't working. The selector valve is located on the truck's frame rail. You can test it by listening for a 'click' or 'whirr' when a friend flips the dash switch (with the key on). If you hear nothing, the valve may be bad or not getting power. If the valve seems to work, the in-tank fuel pump is the next part to check.
Can I just bypass the switch?
While it's technically possible to manually wire the system to run on only one tank, it's not recommended. You would lose the ability to use your second tank and the fuel gauge for that tank. Given the low cost and easy installation of a new switch, replacing it is the best and safest solution.
Are there any recalls for the 1987 GMC V2500 fuel selector switch?
No, there are no specific recalls or Technical Service Bulletins (TSBs) from GM or the NHTSA for the fuel tank selector switch on the 1987 GMC V2500. Issues found were for much newer model years with different fuel systems.
Technical Specifications
OEM Part Numbers: 15599081
Rocker-style switch for dual tank systems with Throttle Body Injection (TBI). Controls both the selector valve and individual in-tank fuel pumps.
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The information in this article is provided for general reference and educational purposes only. Vehicle specifications, procedures, and part compatibility can vary by production date, trim level, and region. Always consult your vehicle's factory service manual and verify part numbers before purchasing or performing repairs. Safety-critical components such as airbags, seat belts, and braking systems should be installed by a qualified professional.
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