Fuel Pump / System Sizing

Size your fuel pump and lines for any HP target on gasoline or E85, with a 20% safety margin built in.

Target HP (crank)

Fuel Type

Induction

Required LPH

208

Required GPH

55.0

With 20% margin (LPH)

250

Min Fuel Line

-8 AN

5/8″ OD

Pumps Meeting Your Flow Requirement (250 LPH min)

Walbro GSS340 (255)

Classic street upgrade; popular GM/Ford/Mopar fit

255 LPH

in-tank

Walbro F90000267 (450)

Flex-fuel capable; available in many OEM sizes

450 LPH

in-tank

Aeromotive Stealth 340

Drop-in for many applications

340 LPH

in-tank

Deatschwerks DW300 (340)

OEM-fit sizes for many platforms

340 LPH

in-tank

Deatschwerks DW400 (415)

High-flow in-tank; great for E85 builds

415 LPH

in-tank

Fore Innovations Triple DW300

Three DW300c; 1000+ HP E85

1020 LPH

in-tank

Bosch 044 (300)

Classic race inline; runs returnless or return

300 LPH

inline

Aeromotive A1000 (1080)

High-HP race; good for 800–1400 HP on gas

1080 LPH

inline

Aeromotive Eliminator (1500)

Extreme HP; 1200+ HP on E85

1500 LPH

inline

Weldon 2345A (1136)

Race; high-pressure capable up to 120 PSI

1136 LPH

inline

Magnafuel ProStar 750 (2839)

High-volume alcohol/EFI race pump

2839 LPH

inline

All Pumps Reference

Pump	LPH	GPH	Type
Walbro GSS340 (255) ✓	255	67	in-tank
Walbro F90000267 (450) ✓	450	119	in-tank
Aeromotive Stealth 340 ✓	340	90	in-tank
Deatschwerks DW300 (340) ✓	340	90	in-tank
Deatschwerks DW400 (415) ✓	415	110	in-tank
Fore Innovations Triple DW300 ✓	1020	269	in-tank
Bosch 044 (300) ✓	300	79	inline
Aeromotive A1000 (1080) ✓	1080	285	inline
Aeromotive Eliminator (1500) ✓	1500	396	inline
Weldon 2345A (1136) ✓	1136	300	inline
Magnafuel ProStar 750 (2839) ✓	2839	750	inline

Fuel Line AN Size Reference

Size	Max HP (gas)	Max HP (E85)	Notes
-6 AN	500	400	Street performance
-8 AN ✓	900	700	Most street/strip builds
-10 AN	1,400	1,100	High-power builds 1000+ HP
-12 AN	2,000	1,600	Race only; extreme HP or dual fuel

All pump LPH ratings are at 40 PSI / 12V. Flow drops as fuel pressure rises — confirm your pump's flow curve matches your system pressure. The 20% safety margin accounts for pressure variance, aging, and heat soak.