Best fuel pump for an LS swap
An LS needs about 58 psi of steady pressure, so the old mechanical pump is out. An in-tank electric pump is the best choice (it runs cooler and doesn't depend on gravity feed), with a 58 psi filter/regulator.
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Sizing (gasoline, pump free-flow rating):
| Pump free flow | Fuel-injected NA | Fuel-injected w/ power adder |
|---|---|---|
| 190 lph (50 gph) | 500 hp | 400 hp |
| 255 lph (67 gph) | 650 hp | 500 hp |
| 340 lph (90 gph) | 850 hp | 600 hp |
| 470 lph (125 gph) | 1,000 hp | 800 hp |
Free-flow ratings drop at EFI pressure, so check the pump's flow curve at 58 psi (plus boost if you're using a boost-referenced regulator), and make sure the pump sees about 13.5 V. Running E85? Choose an ethanol-compatible pump and plan for substantially more flow (see our E85 guide).
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