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Gmc P35/P3500 Van Fuel Tank Selector Valve Connectors

Gmc P35/P3500 Van Fuel tank selector valve connectors

Starting at low prices, AutoBuffy stocks multiple fuel tank selector valve connectors from top OE-quality brands. This connector is the wiring harness pigtail that links the selector valve solenoid to your Gmc P35/P3500 Van's electrical system, telling the valve which fuel tank to draw from. When it corrodes, burns, or breaks, the valve loses its signal and the engine may stall, refuse to switch tanks, or run one tank dry while the other sits full.

Signs your Gmc P35/P3500 Van needs a new fuel tank selector valve connector

  • Engine stalls or stumbles when you attempt to switch between the primary and auxiliary fuel tanks
  • Selector switch on the dash has no effect — the valve stays locked on one tank regardless of switch position
  • One fuel tank drains completely while the other remains full, even after toggling the selector
  • Fuel gauge reads incorrectly or jumps between tanks because the ECM is receiving an intermittent or absent signal from the valve
  • Visible burn marks, melted plastic, or corroded terminals at the connector body near the selector valve
  • DTC codes related to the fuel pump circuit or fuel delivery system appear alongside erratic fuel system behavior

Which fuel tank selector valve connector should you buy for your Gmc P35/P3500 Van?

The main decision comes down to connector position (front tank vs. rear tank side), terminal count, and whether you want a direct OE-match pigtail or a universal repair connector with bare leads. Confirm the terminal count and connector housing style against your existing plug before ordering, as fuel system connectors are not universally interchangeable across configurations.

OE-Match Pigtail Connector
Best for
Fastest, cleanest install with no splicing
What you get
Pre-terminated plug that snaps directly onto the selector valve solenoid; matches factory terminal count, housing, and sealing gasket
Universal Repair Connector (bare leads)
Best for
Budget repairs or hard-to-find pigtail applications
What you get
Loose terminals and a generic housing you crimp and heat-shrink to existing wiring; requires more skill but fits a wide range of configurations
Front-Tank Side Connector
Best for
Vehicles with separate connectors per tank where the front-tank pigtail is the failed component
What you get
Wiring pigtail routed and keyed specifically for the front-tank port on a dual-port selector valve body
Rear-Tank Side Connector
Best for
Vehicles with separate connectors per tank where the rear-tank pigtail is the failed component
What you get
Wiring pigtail routed and keyed for the rear-tank port; often a different length or terminal orientation than the front-side version

Replacing a fuel tank selector valve connector on a Gmc P35/P3500 Van

Easy⏱ 30–60 minutesFlathead terminal pick or connector release toolWire stripper and crimping tool (if splicing a universal connector)MultimeterJack stands or vehicle liftHeat-shrink tubing and heat gun (for spliced connections)

Raise and safely support the Gmc P35/P3500 Van, locate the selector valve along the frame or underbody, and release the locking tab on the damaged connector before unplugging it. If using an OE-match pigtail, splice it to the existing harness wires using heat-shrink crimp connectors, then plug the new pigtail directly onto the valve solenoid. Verify operation by switching between tanks with the engine running before lowering the vehicle.

Frequently asked questions

How much does it cost to replace fuel tank selector valve connectors on a Gmc P35/P3500 Van?
Parts start at low prices for a replacement connector pigtail. If you do it yourself, that's your main cost. A shop typically adds 30–60 minutes of labor for connector replacement alone, though costs rise if wiring repair or selector valve replacement is needed at the same time.
Can a bad fuel tank selector valve connector cause a no-start on a Gmc P35/P3500 Van?
Yes. If the connector fails while the active tank is nearly empty and the valve cannot switch to the fuller tank, the engine loses fuel supply and will crank without starting. A corroded or open-circuit connector can also confuse the ECM, triggering a fuel pump shut-down strategy on some vehicles.
Is it safe to drive a Gmc P35/P3500 Van with a faulty fuel tank selector valve connector?
It depends on which tank is active and how full it is. If the valve is stuck on one tank, you risk running out of fuel unexpectedly once that tank empties. A damaged connector near a heat source also poses a minor fire risk from arcing. Replace it promptly rather than driving on it long-term.
How do I know if the connector is the problem and not the selector valve itself on my Gmc P35/P3500 Van?
Unplug the connector and inspect the terminals for corrosion, melting, or pushed-back pins. Use a multimeter to check for battery voltage at the harness side when the selector switch is activated. If voltage is present at the harness but the valve doesn't operate, the valve is likely at fault. No voltage points to the connector or upstream wiring.
Do I need to drop the fuel tank to replace the selector valve connector on a Gmc P35/P3500 Van?
Usually not. The selector valve and its connector are typically mounted on or near the frame rail or chassis crossmember, accessible from underneath the vehicle without removing the tanks. Raising the vehicle on jack stands or a lift gives adequate clearance in most cases. Always depressurize the fuel system before working in the area.
Should I replace the selector valve at the same time as the connector on a Gmc P35/P3500 Van?
If the valve is the original unit and shows signs of sluggish switching, leaking, or corrosion on the solenoid body, replacing both together makes sense while you already have access. If the valve operates correctly once it receives a clean electrical signal from a new connector, replacing the connector alone is sufficient.

More parts for your Gmc P35/P3500 Van

Ignition Conversion KitEngine Camshaft BushingFuel Pump Cut-Off SwitchHVAC Heater CoreHeadlight Dimmer SwitchHVAC Harness ConnectorPre Heat HoseBrake Master Cylinder

Fuel tank selector valve connectors for other Gmc models

Gmc C25 SuburbanGmc C15Gmc K15/K1500 PickupGmc P2500Gmc V1500 SuburbanGmc G15/G1500 Van