This is a brand new aftermarket waterproof fuel pump relay for the Honda TRX range, built as a direct replacement to your original unit. It is a twin 15 A relay in a single sealed 8-pin housing - the same dual-circuit arrangement Honda uses on these fuel-injected quads to switch the fuel pump and its partner circuit from one compact module mounted under the front rack or seat area. The quality exceeds the OEM equipment, and all shipped product are tested before they leave the factory.
The relay body measures 65 mm long by 19 mm wide by 22 mm high and plugs into the factory 8-pin connector, so fitting is a straightforward unplug-and-replace job with no wiring changes, no soldering and no modification to the loom. Because these machines spend their working lives in mud, river crossings and pressure-washer spray, the waterproof housing matters: water ingress into the original relay is one of the most common reasons a Honda TRX will crank strongly but refuse to fire, or will cut out and restart intermittently once the machine is warm and wet. Cross-references Honda part numbers 38580-HP5-600 and 38580-HP5-601.
Key Features
- Brand new aftermarket relay
- Direct replacement to your original unit
- Waterproof housing
- Twin 15 A relays in a single 8-pin module
- Quality exceeds the OEM equipment
- All shipped product are tested
- No modification, soldering or rewiring needed
Technical Specs
| Specification |
Detail |
| Part Number |
RM11305 |
| Length |
65 mm |
| Width |
19 mm |
| Height |
22 mm |
| Number of Plugs |
1 |
| Number of Pins |
8 |
| Rating |
15 A x2 |
| Sealing |
Waterproof |
Vehicle Fitment Guide
Years shown are the overall coverage span for this part. Please confirm against the OEM part number on your original unit before ordering.
| Make & Model |
Years |
| Honda TRX 420 Rancher |
2007-2018 |
| Honda TRX 500 Fourtrax Foreman |
2007-2018 |
| Honda TRX 680 Rincon |
2007-2018 |
| Honda TRX 700 XX |
2007-2018 |
OEM Part Number Cross Reference
Aftermarket replacement. OEM part numbers are listed for reference only.
| Part Number |
Manufacturer / Brand |
| 38580-HP5-600 |
Honda |
| 38580-HP5-601 |
Honda |
Frequently Asked Questions
Will this fit without modification?
Yes. This is a direct replacement to your original unit on the listed Honda TRX models. It uses the same single 8-pin plug and the same 65 x 19 x 22 mm body, so it goes back into the standard location and connects to the factory loom. No cutting, soldering or rewiring is required.
What is included?
You receive the waterproof twin 15 A relay module itself, ready to plug in. The existing Honda connector and mounting on your machine are reused.
How do I know the old relay has failed?
A failed fuel pump relay usually shows up as an engine that turns over healthily but will not start, with no audible fuel pump prime when the ignition is switched on. Intermittent faults are just as common: the machine runs, then cuts out and will restart after standing, or it fails only when wet or after a river crossing. Before condemning it, check the fuses and the battery, then listen for the two-second pump prime at key-on - silence there points at the relay or its connector.
Why does the waterproof housing matter on a TRX?
These quads work in mud, deep water and get pressure-washed afterwards, and the relay sits in the harness where that water collects. A sealed housing keeps moisture off the contacts, which is exactly where the original units corrode and start giving intermittent no-start faults. If you are replacing a relay that failed after a wet ride, it is worth checking and drying the loom-side connector as well.
Dispatched from the UK · 12-month warranty · Fitment support from our technical team
