Tanks Inc. EFI Fuel Tanks, GPA/PA In-Tank Pumps & Regulators
Smoother starts, steady idle, and no fuel-starve under load—that’s the point. Tanks Inc. hardware pairs baffled, EFI-ready steel tanks with in-tank GPA/PA pump modules to keep fuel covered and pressure stable. Add the right regulator, plumb with PTFE AN lines, and drive like it’s 2025—not 1985.
Squarebody EFI Tanks (1978–87)
Short/long bed options with internal baffled trays for reliable EFI fueling. Correct filler-neck sizes for early (1-1/4") vs. late (1-5/8") trucks.
- Short bed 16 gal (TM11A-T / TM11B-T)
- Long bed 20 gal (TM1A-T / TM1B-T; also fits 1988–91 R/V)
All use 5-bolt senders and mount in the OE saddle location ahead of the axle.
GPA Series In-Tank Pump Modules
Quiet, reliable, up to 100 PSI, with 1/4" NPT supply/return and a barbed vent on a heavy 10-gauge mounting plate.
- GPA-TBI — 109 LPH (TBI / low-pressure)
- GPA-2 — 190 LPH
- GPA-4 — 255 LPH (most LS swaps)
- GPA-5 — 340 LPH
- GPA-6 / GPA-8 / GPA-9 — 400–450+ LPH
PWM note: gerotor pumps in GPA modules aren’t PWM-compatible; disable PWM on systems like FiTech.
PA Series In-Tank Pump Kits
Universal retrofit modules for a range of Tanks Inc. applications with detailed HP guidance at common EFI pressures.
Use the table below to map LPH to estimated horsepower.
Regulators & Filter/Regulators
- Adjustable Bypass Regulator (35–70 PSI, includes three -6 AN adapters & gauge)
- Corvette-style 58 PSI Filter/Regulator (LS swaps; not for pumps over 255 LPH)
How to Choose Your Pump
Pick flow for your power goal (gasoline), then regulate correctly. When in doubt, size up one step.
| Module |
Flow |
Typical Use |
Power Guide* |
Notes |
| GPA-TBI |
109 LPH |
TBI / low-pressure EFI |
≈250–300 hp |
~15–20 PSI systems |
| GPA-2 |
190 LPH |
Mild EFI & NA builds |
Up to ~450 hp |
Up to 100 PSI |
| GPA-4 |
255 LPH |
Most LS swaps (58–60 PSI) |
Up to ~630 hp |
Disable PWM |
| GPA-5 |
340 LPH |
Higher-output builds |
~700–800+ hp |
High-flow, up to 100 PSI |
| GPA-6 / GPA-8 / GPA-9 |
400–450+ LPH |
Boosted / future-proof |
800+ hp (setup-dependent) |
Up to 100 PSI |
*Estimates for gasoline at typical EFI pressure. Injector size, voltage, base pressure, and duty cycle affect real results.
Why Buy Tanks Inc. Gear from Hot Rod AN
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Squarebody clarity: we spell out early vs. late filler-neck sizes and bed-length capacities so you order once and install once.
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Real pump matching: flow-to-horsepower guidance and the PWM caveat spelled out, so your combo works the first time.
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End-to-end plumbing: pair your tank/pump with our PTFE hose bundles, ≤10 μm filters, and AN adapters for a leak-free system.
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Expert install help: see our Install page and PTFE hose guide. Questions? We’ll help size everything.
Quick FAQs
Do the squarebody tanks include baffling?
Yes. They use an internal tray and EFI-ready baffling to keep the pickup covered, reducing fuel starvation on acceleration and cornering.
Are GPA modules PWM compatible?
No. GPA pumps are gerotor style; disable PWM control on systems that offer it (e.g., FiTech). Use standard constant-voltage control.
What ports do GPA modules use?
They have 1/4" NPT supply and return ports, plus a barbed vent on the mounting plate.
What regulator should I run?
For tunable setups, Tanks Inc.’s adjustable bypass regulator covers 35–70 PSI and includes (3) -6 AN adapters and a gauge. For LS swaps, the Corvette-style filter/regulator is fixed at 58 PSI and is not recommended with pumps over 255 LPH.
