Pasangui Fuel Check Valve Repair Tools Rebuild Kit Installation Tool MC400 & Fuel Tool Kit MC300 Compatible With Harley Davidson EFI Fuel System Fit For Harley Davidson 2001-2025 Models Replaces MC-400 MC-300

Why I Picked Up This Kit

Fuel leaks at the quick disconnect are one of those annoyances on older (and not-so-old) EFI Harleys that can sideline a ride and leave the garage smelling like a pump station. I’ve rebuilt a few of these check valves over the years using improvised picks, and I’ve also pulled tanks when a job went sideways. Neither is fun. That’s why I was eager to try the Pasangui check valve kit—essentially a purpose-built set for servicing the Harley-Davidson EFI quick disconnect check valve without removing the tank.

I used the kit on two bikes: a late-2000s Sportster and a mid-2010s touring model, both with the familiar EFI quick disconnect at the tank. In both cases, the job stayed on the bike, no tank removal, and I walked away with dry connections and proper return spring action.

What’s in the Box

The kit arrives in a compact, hard-plastic case with foam cutouts for each piece. Inside you’ll find:
- A pro-grade installation/holding tool (the MC-400/MC-300 equivalent) with a threaded collar to control the valve.
- Five large and five small Viton O‑rings rated for heat and fuel.
- Five stainless return springs.
- Five large and five small hook tools to extract the old seals.
- A handful of spare bits so you can service multiple bikes or repeat the repair down the road.

The included hardware feels purpose‑made rather than repurposed from a generic pick set. The holding tool is the star: it mates to the quick disconnect, depresses/holds the internal valve in a controlled way, and gives you room to work. The hooks are small enough to navigate the bore without chewing up the sealing surfaces. The springs are consistent across the batch—no oddball part lengths or soft rates out of the bag.

Build Quality and Design

Machining on the main tool is better than I expected at this price point. The threads engage smoothly, and the collar has enough grip to control with one hand, even with nitrile gloves on. The finish isn’t jewelry grade, but this is a service tool that’s going to live in fuel and grime; function matters more, and it delivers.

The hooks are consumable in my view—thin, stiff, and sharp enough to get under a stubborn O‑ring without gouging the valve body. I managed to keep mine straight, but if someone ham‑fisted a removal, I could see a hook bending. Thankfully, the kit includes multiples.

Viton O‑rings are the right call for gasoline and heat, and they’re what I’d choose if I were piecing a set together on my own. You get both large and small sizes, covering the common Harley EFI variants. The springs drop in without fiddling.

Setup and Safety

A couple of prep notes that made the process cleaner:
- Relieve fuel pressure first (I pull the fuel pump fuse and run the bike until it stalls).
- Disconnect the battery ground.
- Work with a fan or outdoors; keep ignition sources far, far away.
- Lay towels around the connector and keep a small catch container handy—there will be residual fuel.

None of this is unique to this kit, but it’s worth repeating. The tool keeps things controlled, not mess‑free.

The Process in Practice

On both bikes, I connected the Pasangui tool to the tank-side quick disconnect and used the threaded collar to depress the internal valve. That’s the trick: holding the valve open while giving yourself steady access to the seal and spring. Without a tool like this, you’re fighting the internal spring and the limited working space; with it, you have a secure, repeatable setup.

Extraction of the old O‑ring is still the fiddly part. The supplied hook with the finer point was the one I used the most. It took a couple of patient passes to work the brittle seal out without nicking the bore. A drop of clean fuel on the new O‑ring helps it seat. If your valve’s return action feels lazy, swap the spring while you’re in there—it’s a two-minute addition once the valve is open.

Reassembly is straightforward: new spring (if needed), new O‑ring, verify the seat is clean, release the collar slowly, and check that the valve snaps shut positively. After reattaching the fuel line, I primed the pump, watched for seepage, then started the bike and let it warm while monitoring the joint. No drips on either machine, and reconnect/disconnect feel improved over the worn seals.

Performance and Results

The practical outcome is what matters:
- Both bikes held pressure with no seepage at the quick disconnect.
- Reconnect effort dropped noticeably—no binding or sticking on the male fitting.
- The valve’s return felt crisp with the new springs.

I put a few hundred miles on the touring bike after the rebuild and checked the area each ride. It stayed bone dry. The Sportster’s owner reported the gas smell in the garage disappeared overnight.

What the tool best delivers is control. Instead of relying on improvised picks and three hands to hold a valve open, you thread the collar, lock the valve at a working depth, and proceed deliberately. That lowers the chances of scoring a sealing surface—arguably the biggest risk when doing this job in-situ.

Compatibility Notes

The kit is advertised for Harley-Davidson EFI fuel-injected models from 2001 through current model years. On the two bikes I serviced (both stock quick disconnects), sizing was correct with the included O‑rings and springs. If your quick disconnect has been swapped for an aftermarket coupler, double-check dimensions before you assume the included seals fit. Carbureted models don’t apply.

What Could Be Better

• Documentation: My kit included basic guidance, but I’d like a clearer diagram showing O‑ring sizing and where the spring sits inside the valve body. If you haven’t handled this connector before, a quick visual reference helps.
• Include a tiny packet of fuel‑safe lube: Not essential, but it would make installing new O‑rings more foolproof.
• Hook durability: They work, but they’re thin by necessity. Take your time. I’d keep a spare hook from the kit in the case after each job, just in case someone on your bench leans too hard on one.

None of these are deal breakers, and they’re largely nitpicks for a kit that’s otherwise well thought out.

Value and Longevity

You get enough consumables for up to five rebuilds, along with the main tool you’ll keep long term. Compared with replacing the entire coupler or paying shop labor to pull a tank, the math favors this kit quickly—especially if you maintain multiple EFI Harleys or help friends. Viton seals and stainless springs are the right materials for the environment, and the primary tool should last if you keep its threads clean and avoid cross‑starting the collar when it’s fuel-wet.

The one-year limited warranty is a welcome safety net. I didn’t need it, but it’s good to see some backing on a specialty tool.

Tips From the Bench

• Lighting helps. Aim a small task light directly into the connector to see what your hook is doing.
• Use the smallest hook first. It’s tempting to use more leverage, but finesse wins here.
• Inspect the mating surfaces on the male coupler before reconnecting; clean off varnish or grit so you don’t damage the new seal.
• Prime and pressure check twice. Cycle the ignition, watch for weeping, then start and recheck warm.

Bottom Line

The Pasangui check valve kit does exactly what I want from a specialty tool: it turns a finicky, high-stakes job into a controlled, repeatable process and keeps the tank on the bike. The included O‑rings and springs are the right materials, the holding tool is well executed, and the case keeps it organized for the next time a quick disconnect starts weeping.

Recommendation: I recommend this kit for any home mechanic or shop that services Harley-Davidson EFI models. If you’ve ever smelled fuel after a ride or noticed dampness around the tank-side quick disconnect, this tool makes the rebuild safer and faster. It pays for itself in saved labor, reduces the risk of damaging the connector, and gives you enough consumables for multiple repairs. It’s not magic—you’ll still need patience to tease out old seals—but it’s the right tool for a job that’s otherwise too easy to botch.