Diesel Engine Repair Jacksonville
When your diesel-powered boat won’t start or loses power on the St. Johns River, you need a mechanic who can come to you — fast. Run & Gun Boat Repair Jacksonville specializes in diesel engine repair for recreational and commercial vessels throughout the greater Jacksonville area. We bring the tools, the expertise, and the fix directly to your dock, slip, or ramp.
Trusted Service You Can Rely On
Run & Gun Boat Repair Jacksonville is the mobile marine mechanic team locals trust when a diesel problem sidelines their boat. Whether you’re dealing with a no-start situation at a Mandarin marina or sluggish performance out on the Intracoastal, our experienced mechanics handle diesel engine repair right where your vessel sits — no towing required. Alongside diesel work, we cover everything from inboard repair to electrical service, so one call to (904) 512-2431 — we come to your dock — can solve multiple issues in a single visit. Explore our full range of services at boat repair jacksonville and see why Jacksonville boaters keep coming back.
Why Choose Us?
- Our mechanics diagnose diesel fuel system faults, injector failures, and turbocharger issues with professional-grade equipment — not guesswork.
- We carry common diesel parts and filters on the truck, so many marine diesel repairs are completed in a single visit without waiting on a shop order.
- Transparent, itemized quotes before any work begins mean you know exactly what the diesel engine repair will cost — no surprise invoices.
- Flexible scheduling Monday through Sunday means we can reach your slip before your weekend trip is ruined by a blown heat exchanger or clogged fuel injector.
- Every repair is backed by guaranteed quality craftsmanship, from a routine fuel filter service to a full diesel engine overhaul.
Diesel Engine Diagnostics
Accurate diagnosis is the foundation of every successful marine diesel repair. We connect professional scan tools and perform compression and fuel pressure tests to pinpoint the exact fault before any parts are ordered or replaced.
Serving Jacksonville & Surrounding Areas
Run & Gun covers a wide stretch of Northeast Florida for marine diesel repair near me searches — meaning wherever your boat is, we're likely within reach. We regularly service vessels in Orange Park, Fleming Island, Green Cove Springs, and Middleburg along the St. Johns River corridor, as well as coastal communities including Atlantic Beach, Neptune Beach, and Ponte Vedra Beach. Within Jacksonville itself we work across Mandarin, Ortega, Beauclerc, Arlington, and Julington Creek, among other districts. If you're docked in St. Augustine or Fernandina Beach, we make those runs too. Call (904) 512-2431 — we come to your dock — and we'll confirm availability for your location on the spot.
Jacksonville Neighborhoods
Nearby Communities
Green Cove Springs
Common Signs You Need Service
Catching a diesel problem early can mean the difference between a quick dockside fix and a costly engine-down situation in the middle of the St. Johns River — don't wait until a small symptom becomes a full breakdown.
Hard or Slow Starts:
If your diesel cranks longer than usual before firing, or fails to start at all, fuel delivery or glow-plug issues are likely culprits that worsen quickly without attention.
Excessive Black or White Smoke:
Black smoke signals incomplete combustion from injector or air-filter problems; white smoke often points to coolant entering the combustion chamber — both need prompt marine diesel repair.
Sudden Power Loss:
A noticeable drop in top speed or throttle response under load can indicate a clogged fuel filter, failing lift pump, or early turbocharger wear.
Overheating Warning Light:
An overtemperature alarm or rising gauge reading means the cooling system is struggling — continuing to run risks warped heads and a far more expensive repair.
Frequently Asked Questions
How much does marine diesel engine repair typically cost in Jacksonville?
Costs vary widely depending on the fault. A fuel filter service or impeller replacement might run well under a few hundred dollars, while injector replacement or heat-exchanger work sits in a mid-range bracket. We provide a free, itemized quote before any work begins so there are no surprises.
Can you do marine diesel repair near me, or do I have to bring the boat to a shop?
That's exactly what Run & Gun is built for. We bring tools, diagnostic equipment, and common parts to your dock, slip, or ramp anywhere in our service area — from Fernandina Beach down to St. Augustine and everywhere in between. No trailering required.
How often should I service my marine diesel engine?
Most manufacturers recommend an oil and filter change every 100 engine hours or annually, whichever comes first, with a more thorough inspection — impeller, belts, heat exchanger — every season. Jacksonville's year-round boating means many owners hit those hour thresholds faster than they expect.
What are the most common causes of diesel engine failure on boats in Jacksonville?
In our experience, the top culprits are contaminated fuel (especially after the boat sits unused), worn raw-water impellers that cause overheating, and neglected fuel filters that starve injectors. Regular preventive maintenance catches all three before they become a roadside — or rather, waterside — emergency.
Ready to get your diesel running right again?
Call (904) 512-2431 — we come to your dock, wherever in the Jacksonville area you're located. Or if you'd like to plan ahead, get a free quote and we'll schedule a visit that fits your time on the water.