Fuel Pump, In-line/External 255LPH E85
Quick Overview
- Integral Racetronix RXP-255E2 255 LPH E85 fuel pump with check valve
- 229 LPH at 58 PSI (253 at 43.5 PSI); supports 550+ HP naturally aspirated
- Large -10 AN ORB inlet, -8 AN ORB outlet and bleeder/primer port
- Billet anodized T6 aluminum housing and mounting bracket
- Internal safety circulatory bypass and sound-dampening design
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$315.98
per EACH (USD)Fuel Pump, In-line/External 255 LPH E85
A Racetronix RXP-255E2 E85 pump sealed inside a billet T6 aluminum housing, ready to plumb in-line with AN fittings.
The Racetronix RXP255LE is a quiet, reliable in-line (external) fuel pump for gasoline and E85. Our patent-pending design seals a Racetronix RXP-255E2 turbine pump inside a black-anodized billet T6 aluminum housing with large AN ports, giving you a proven in-tank E85 pump in a compact, bolt-on in-line package.
The pump’s integral check valve holds fuel in the line so the pump stays primed and pressure holds after shutdown for quicker starts. It also stops fuel from back-feeding through an idle pump, so two or more pumps can run in parallel or staged. Its high-pressure safety bypass valve stays fully functional inside the housing, protecting the system if a line is kinked or a regulator sticks.
Key features
- Racetronix RXP-255E2 turbine pump with integral check valve, E85 compatible and field-serviceable.
- Billet T6 aluminum housing and mounting bracket, black anodized. The bracket has recessed screw holes and mounts from the top or the underside, with a rubber isolation strip.
- Large -10 AN ORB inlet to feed the pump without restriction, plus a -8 AN ORB outlet.
- Air-bleed / primer port beside the inlet, so air can be purged from the feed line and housing.
- Sealed 6 mm stainless power studs with PTFE (Teflon) insulators and Viton GF-600S (FKM) O-rings (BHS-6MSS). No flying leads.
- Quieter operation. The housing isolates and dampens noise from the pump.
- Fuel-safe materials throughout: stainless steel hardware, PTFE insulators and Viton GF-600S (FKM) O-rings.
Specifications
| Internal pump | Racetronix RXP-255E2 (field-serviceable) |
| Fuel | Gasoline and E85 |
| Horsepower | 550+ HP at 60 PSI (naturally aspirated) |
| Test voltage | 13.5 V |
| Inlet port | -10 AN ORB female (7/8-14 SAE) |
| Outlet port | -8 AN ORB female (3/4-16 SAE) |
| Bleed / primer port | Inlet end, beside the inlet port |
| Power connection | Two 6 mm stainless studs (+ / -) on the outlet end, PTFE insulated, sealed with Viton GF-600S (FKM) O-rings |
| Overall length | 187 mm (7.36") including ports; body 170 mm (6.69") |
| Housing diameter | 70 mm (2.75") |
| Housing | Billet 6061-T6 aluminum, black anodized |
| Mounting | Billet T6 aluminum bracket with recessed screw holes and rubber isolation strip; mounts from the top or the underside for surface or through-hole mounting |
Flow and current draw
| Fuel pressure | Flow | Current draw |
|---|---|---|
| 43.5 PSI (3 bar) | 253 LPH (67 GPH) | 10.1 A |
| 58 PSI (4 bar) | 229 LPH (60 GPH) | 11.2 A |
| 80 PSI | 195 LPH (52 GPH) | 12.3 A |
Flow and current are typical 13.5 V values from Racetronix RXP255 bench test data. Actual results vary with voltage, fuel, temperature and plumbing.
Which RXP-LE pump is right for you?
All three RXP-LE pumps share the same housing, ports and mounting. They differ only in the pump inside.
| Model | Internal pump | Flow @ 58 PSI | Current @ 58 PSI | Horsepower (NA, 60 PSI) |
|---|---|---|---|---|
| RXP255LE | Racetronix RXP-255E2 | 229 LPH | 11.2 A | 550+ |
| RXP450LE | Walbro F90000274 | 391 LPH | 17.1 A | 750+ |
| RXP525LE | Walbro F90000285 | 429 LPH | 18.7 A | 900+ |
Installation requirements
Skipping any of these will reduce flow and shorten pump life, and can damage the pump.
- Gravity feed only. Mount the pump below the tank outlet so fuel flows to it on its own. A turbine pump cannot pull fuel up to itself and will lose its prime.
- Pre-filter (inlet): 30 micron or finer. The pump has no in-tank sock, so this filter is all that protects it. Use a large element; an undersized filter on the suction side starves the pump.
- Post-filter (outlet): 10 micron or finer to protect your injectors and engine.
- Feed (inlet) line: -8 minimum, -10 recommended. PTFE-lined hose.
- Outlet line: -6 minimum, -8 recommended.
- Upgraded wiring. Power the pump through a dedicated relay harness such as the FPWH-009HD. Factory pump wiring is not adequate for this current draw.
- Bleed before first start. Use the bleed port to purge air from the feed line and housing before the pump runs.
Dimensions in millimetres (inches). Same housing for RXP255LE, RXP450LE and RXP525LE.
Parts you’ll need
| Part | What it does |
|---|---|
| FPWH-009HD | Universal HD relay power harness for the pump |
| FILTER-1212B (x2) | Ø61 mm -12 ORB filter housings, one for the pre-filter and one for the post-filter |
| FEM-1230 | 30-micron E85 magnetic element for the pre-filter |
| FEM-1210 | 10-micron E85 magnetic element for the post-filter |
| ADF-495106 | -10 AN ORB male to -10 AN JIC male adapter for the inlet |
| ADF-495103 | -8 AN ORB male to -8 AN JIC male adapter for the outlet |
All of these are listed under Add Ons at the bottom of this page.
Frequently asked questions
Can I mount the pump above the fuel tank?
No. The pump must be gravity fed: mount it below the tank outlet so the feed line stays full of fuel. A turbine pump cannot draw fuel up a dry line, and running it without fuel will damage it.
Do I really need both a pre-filter and a post-filter?
Yes. The pre-filter (30 micron or finer) is the only thing protecting the pump from debris, because there is no in-tank sock. The post-filter (10 micron or finer) protects your injectors. Use generously sized elements; a small, fine pre-filter restricts the suction side and starves the pump.
What size fuel lines do I need?
Use -10 PTFE-lined hose on the feed side (-8 minimum) and -8 on the outlet (-6 minimum). Undersized lines reduce flow and make the pump work harder.
How do I prime the pump?
Use the bleed port beside the inlet to purge air from the feed line and housing before the pump runs. Do this on first installation and any time the feed line has been opened.
Which wiring harness should I use?
We recommend the FPWH-009HD universal HD relay harness. The RXP255LE draws about 11.2 A at 58 PSI, which is more than most factory pump circuits are designed to carry.
Can I run two pumps?
Yes. Each pump’s integral check valve stops fuel from back-feeding through the other pump, so two or more RXP-LE pumps can run in parallel, either together or staged with the second pump switched on under boost or high load.
Should I use a voltage booster?
Racetronix recommends an alternator voltage booster for all of its fuel pump systems. In-line pump boosters such as the Kenne Bell Boost-A-Pump are not recommended.
Is the safety bypass valve still functional inside the housing?
Yes. The housing is designed so the pump’s high-pressure bypass valve stays fully functional. If a line is kinked or a regulator sticks, the valve opens and recirculates fuel inside the housing instead of over-pressurizing the system.
Can the internal pump be replaced?
Yes. The pump is field-serviceable, and the Racetronix RXP-255E2 is sold separately.
Which RXP-LE pump should I choose?
Compare the flow you need at your base pressure in the table above. Most modern EFI systems run 58 PSI (4 bar). Plan on a 20–25% safety margin between what your engine needs and what the pump delivers.
Questions and support
Not sure which pump or parts your build needs? Email [email protected] before you order.
Racetronix provides technical support to verified customers through our support forum, not by phone or email. Please request forum access when you place your order so your account is approved before your parts arrive. The forum is moderated, open 24/7, and holds a knowledge base going back to 1999.
