Didn’t get to select L or R side when ordering.
Didn’t get to select L or R side when ordering.
The hose and fittings are nice quality. Their ability to get stuff shipped out quickly dose not happen.
It took a week to get my order to shipping.
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Free Shipping $99+
Lifetime Warranty
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EFI Fuel Tank — 1978–87 Chevy/GMC Squarebody (Short & Long Bed) + Pump Options Tanks Inc.
$829.00
Free Shipping $99+
Lifetime Warranty
Expert Support
Reliable shipping
EFI-Ready Fuel Tanks for 1978–87 Chevy/GMC Squarebody (Short & Long Bed)
Rock-solid fuel delivery for EFI and LS swaps. These die-stamped, alloy-coated steel tanks add a 4.8 L dual-tube baffled tray to keep the pickup covered in corners and hard stops.
Result: easier hot starts, steady idle, and no fuel-starve on launch. Looks OE under the bed, drives like modern EFI.
How to order: choose your Year/Bed fitment below, then pick the GPA in-tank pump flow that matches your horsepower. You can add a 5-bolt sender now or later—your call.
Note: GPA-4 is the most popular pump option featuring a Walbro 255LPh pump
Fuel pump outlets are 1/4 NPT - select the correct NPT to AN adapter for your matching hose kit. Here
- ✅ Baffled EFI tray (4.8 L) controls slosh
- ✅ Quiet in-tank pump options (109–450 LPH)
- ✅ OE-style fit: in stock location
- ✅ Powder-coated, corrosion-resistant steel
Fitment at a Glance
1978–81 Short Bed
Part: TM11A-T
Capacity: 16 gal
Size: 42-7/8" × 14-1/8" × 11"
Filler neck: 1-1/4"
Sender: 5-bolt
1978–81 Long Bed
Part: TM1A-T
Capacity: 20 gal
Size: 56" × 14-1/8" × 11"
Filler neck: 1-1/4"
Sender: 5-bolt
1982–87 Short Bed
Part: TM11B-T
Capacity: 16 gal
Size: 42-7/8" × 14-1/8" × 11"
Filler neck: 1-5/8"
Sender: 5-bolt
1982–87 Long Bed (also 1988–91 R/V)
Part: TM1B-T
Capacity: 20 gal
Size: 56" × 14-1/8" × 11"
Filler neck: 1-5/8"
Sender: 5-bolt
🛠️ Pick your fitment (78–81 or 82–87, short/long), then pick your pump (quiet, EFI-stable, sized for your build). Less heat, less noise, more reliability.
Choose Your In-Tank Pump (GPA Series)
All modules drop into the built-in tray and use 1/4" NPT feed/return ports. Up to 100 PSI capability. Gerotor pumps—disable PWM control on systems like FiTech.
| Pump | Flow | Best For | Power Guide* | Notes |
|---|---|---|---|---|
| GPA-TBI | 109 LPH | TBI / low-pressure EFI | ~ up to 250–300 hp | ~15–20 PSI max |
| GPA-2 | 190 LPH | Mild EFI & NA builds | Up to ~450 hp | Up to 100 PSI; 1/4" NPT |
| GPA-4 | 255 LPH | Most LS swaps (58–60 PSI) | Up to ~630 hp (gasoline) | Disable PWM; 1/4" NPT |
| GPA-5 | 340 LPH | Higher output builds | ~700–800+ hp | High-flow; up to 100 PSI |
| GPA-6 | 450 LPH | Forced-induction / room to grow | 800+ hp (setup-dependent) | High-flow; up to 100 PSI |
*Power estimates assume gasoline at typical EFI pressure; injector size, base pressure, voltage, and duty cycle affect real output.
Specs & Fitment
Short Bed (6')
| Years | Part # | Capacity | Dimensions (L × W × H) | Filler Neck | Notes |
|---|---|---|---|---|---|
| 1978–81 | TM11A-T | 16 gal | 42-7/8" × 14-1/8" × 11" | 1-1/4" | Baffled tray; 5-bolt sender |
| 1982–87 | TM11B-T | 16 gal | 42-7/8" × 14-1/8" × 11" | 1-5/8" | Baffled tray; 5-bolt sender |
Long Bed (8')
| Years | Part # | Capacity | Dimensions (L × W × H) | Filler Neck | Notes |
|---|---|---|---|---|---|
| 1978–81 | TM1A-T | 20 gal | 56" × 14-1/8" × 11" | 1-1/4" | Baffled tray; 5-bolt sender |
| 1982–87 (1988–91 R/V) | TM1B-T | 20 gal | 56" × 14-1/8" × 11" | 1-5/8" | Baffled tray; 5-bolt sender |
What’s Included
- EFI-ready coated steel tank in your selected fitment
- GPA in-tank pump module (if selected)
- 5-bolt fuel level sender (if selected)
Recommended Add-Ons
- PTFE Hose & Fittings Bundles for feed/return plumbing
- ≤10 μm EFI Fuel Filters (pressure side) & Factory-Style Inline Filter Kit for return-style regulators
- Install Tool Bundle (cutter, vise jaws, wrenches)
- AN Adapter Fittings to mate tank lines/regulators
- LS Swap Fuel Line Kits for a complete system
Install Notes
- Mounts in the stock saddle-tank location (ahead of rear axle).
- Sender pattern: 5-bolt. Tube or reed senders use 10" length for these tanks.
- PWM: GPA gerotor pumps are not PWM compatible—disable pump PWM on systems that offer it (e.g., FiTech).
- Plumbing: GPA modules use 1/4" NPT feed/return ports; vent is barbed.
- Emissions: replacement-part use only where required; does not modify emissions equipment.
FAQs
Which pump should I choose?
For most LS swaps at 58–60 PSI, choose GPA-4 (255 LPH)—quiet, reliable, and supports ~630 hp on gasoline. Bigger power or boost? Step to GPA-5 or GPA-6. TBI or low-pressure systems can use GPA-TBI.
Will my factory gauge work?
Yes. Select a 0–90 Ω 5-bolt sender for stock GM gauges, or match your aftermarket gauge’s ohm range.
What’s the difference between 1978–81 and 1982–87 tanks?
Early tanks use a 1-1/4" filler neck; later use 1-5/8". Short is 16 gal; long is 20 gal. The 82–87 long-bed tank also covers 1988–91 R/V.
Shipping
Most orders ship within 1–2 business days. Free shipping on $99+ to the contiguous U.S.
Returns
Uninstalled items in original packaging are eligible for returns per our policy. Contact support for an RMA.
Quality
Die-stamped steel tanks with internal baffling and durable powder coat. GPA modules use genuine high-quality pumps and 1/4" NPT ports.