Long cranks, sputtering under load, a whine from the tank. We put a gauge on the system and test real pressure and volume before we replace a single part.
The fuel system has one job: deliver a steady, measured amount of clean fuel at the right pressure, every time you turn the key. A pump in the tank pushes it, a filter or strainer keeps debris out, lines carry it forward, and injectors spray it in a fine pattern the engine can actually burn. When any one of those drifts out of spec, the engine doesn't quit, it starts running badly, and that's what most people notice first.
Fuel problems get guessed at more than almost anything else on a car, so we test instead. We put a gauge on the system and watch real pressure at idle, under load, and after shutdown. A pump that looks fine at idle can fall on its face when the engine asks for more, and a system that bleeds down overnight explains a long morning crank better than any hunch does. We check volume as well as pressure, and we read fuel trims to see what the computer has been quietly compensating for.
Florida hands fuel systems two problems that drier states don't. Ethanol blended gas pulls moisture out of humid air, and a vehicle that sits for weeks at a stretch, a work truck, a second car, a camper, can end up with water and varnish in the tank instead of clean fuel. That shows up as hard starts, rough running and clogged injectors long before anyone suspects the fuel itself.
On injectors we'll give you the straight answer. Cleaning genuinely helps an injector that's dirty and still spraying. It does nothing for one that's failing electrically, leaking down, or physically damaged, and selling you a cleaning on that injector just delays the repair you actually need. We test them, tell you which category yours fall in, and go from there, with the test results in front of you.
3 fuel system repair jobs at our Lake Wales shop in the last 90 days.
Vehicle
What we found
2018 Nissan TITAN
Fuel System Repair · Nov 2026
The technician found the fuel injectors on cylinder #3 and #7 had failed, so the problem was not limited to the one injector in the estimate.
2017 Nissan Sentra
Fuel System Repair · Aug 2026
The technician started with an initial assessment at no charge and updated the service manager within 30 minutes, noting that further testing might be needed…
3 fuel system repair jobs at our Sebring shop in the last 90 days.
Vehicle
What we found
2014 Ford Mustang
Fuel System Repair · Oct 2026
At our Sebring shop, the technician started with smoke machine emissions testing on the emissions components.
2001 Ford F-350 Super Duty
Fuel System Repair · Oct 2026
At our Sebring shop, the technician removed and replaced the in-tank fuel pump assembly and fuel gauge sending unit, removing and replacing components as…
6 fuel system repair jobs at our Haines City shop in the last 90 days.
Vehicle
What we found
2014 Chevrolet Equinox
Fuel System Repair · Oct 2026
The technician found that the low pressure fuel pump had failed, starving the high pressure pump.
2004 GMC Sierra 1500
Fuel System Repair · Oct 2026
The vehicle had a check engine light fault code on and a fuel gauge that was not operating, and the repair centered on the in-tank fuel pump assembly.
1 fuel system repair job at our Winter Haven shop in the last 90 days.
Vehicle
What we found
2003 Ford Mustang
Fuel System Repair · Oct 2026
The initial assessment at our Winter Haven shop was done at no charge, and it showed the vehicle needed a fuel pump and filter replacement.
1 fuel system repair job at our Frostproof shop in the last 90 days.
Vehicle
What we found
2019 Chevrolet Silverado 1500
Fuel System Repair · Oct 2026
The team at our Frostproof shop started with an initial assessment at no charge, and the work centered on the fuel tank.
4.8 (2,067) as of Nov 20264.8 out of 5, from 2,067 Google reviews, as of November 2026
31600 U.S. 27
Mon to Fri, 7:30 AM to 5:30 PM; Sat and Sun, closed
4.8 (162) as of Nov 20264.8 out of 5, from 162 Google reviews, as of November 2026
101 North Scenic Highway
Mon to Fri, 7:30 AM to 5:30 PM; Sat and Sun, closed
4.8 (547) as of Nov 20264.8 out of 5, from 547 Google reviews, as of November 2026
323 North Scenic Highway
Mon to Fri, 7:30 AM to 5:30 PM; Sat and Sun, closed
4.7 (172) as of Nov 20264.7 out of 5, from 172 Google reviews, as of November 2026
435 North Orange Street
Mon to Fri, 7:30 AM to 5:30 PM; Sat and Sun, closed
4.9 (34) as of Nov 20264.9 out of 5, from 34 Google reviews, as of November 2026
201 North 6th Avenue
Mon to Fri, 7:30 AM to 5:30 PM; Sat and Sun, closed
4.8 (592) as of Nov 20264.8 out of 5, from 592 Google reviews, as of November 2026
5100 Dundee Road
Mon to Fri, 7:30 AM to 5:30 PM; Sat and Sun, closed
Our experts diagnose and resolve any issue.
Often the system is losing pressure after shutdown, through a pump check valve or a leaking injector. The engine has to rebuild pressure before it can start.
The pump or filter can keep up at idle but not when you ask for power. A pressure and volume test while the engine is working shows it immediately.
That's usually the fuel pump working harder than it should, sometimes because the strainer is clogged or the pump is wearing out. It tends to get louder over weeks.
Low pressure, a restricted filter, or injectors that can't hold a clean idle spray pattern. Fuel trim data usually points to which one before we touch anything.
Ethanol blended fuel absorbs moisture, and a tank that sat through a humid stretch can leave water and varnish behind. Vehicles that only get driven occasionally see this most.
A leaking line, injector, or connection. Fuel odor is one we want to see right away rather than schedule out.
I would recommend Johnnys over and over! My daughter is in the area for college and her fuel pump went out. I am 6 hours away. As a Father that is a helpless feeling because I am not there to fix the problem! 1 call to Johnnys . Tow was set up and at the shop within the hour. Soon there after the texts with the diagnosis,pics and detailed parts list and labor cost. Parts ordered. Great service! The best part is the care and compassion that Rebecca gave me. The feeling I got was like "Hey! We got you. Your daughter will be taken care of" That's Super Service! Thank you! Joey F.
Joey Faircloth
Verified Google Review
My car’s fuel evaporative system needs some replacement and I was so worried because the previous auto shop I went to quoted me A LOT $$$$! I felt hopeless because it will take me many months to procure that amount while worrying that my car’s condition is gonna get worse. So I called around and that’s when I found Johnny’s Automotive and I am so so glad that I have found them. They invited me over to bring the car for diagnosis. And I was really impressed with the shop’s amenities while I waited! There was ample snacks and drinks, spacious seating area with TV, a game corner, a study corner complete with outlets, a massage chair (!!), and a mini golf outside! 😆 I spoke with Mike, the technician who was taking care of our car and he explained to us thoroughly what’s going on and what they could do. No upselling and such. Just straight facts. And guess what? The total repair costed me less than $1k than I was quoted from the previous shop. I saved a lot with Johnny’s automotive. Plus Mike was so kind to explain everything easily for me while giving me tips on how to extend our 2015 prius’s lifespan. We’re planning to keep it much much longer. Their customer service is top-notch. They set the bar high for me now. I also find it sweet they leave us a flower in the car. Thank you!
Elreyna Jane Cale
Verified Google Review
Another good job by Johnny’s in Dundee. Needed a new fuel pump. Johnny’s was fast and came in a little lower than the estimate. .
Mark Garcia
Verified Google Review
Had my trucked towed to Johnnys in Lake Wales for fuel flow issue. Long story short, they started the truck many times and it worked. I was expecting to be charged but they did not. I will be a Johnnys fan for life. Nicely done.
Joe
Verified Google Review
Was having major problems with my fuel system on my 04 Super duty. Took it in to Johnny’s. They diagnosed the issue and repairs needed in just a few hours. Completed the repairs and it’s running like new. They were all very knowledgeable professionals and have definitely gained a new customer with my wife and I. I highly recommend this business.
Scott Sullivan
Verified Google Review
My fuel pump went out on my F150 and when the dealers were 4-6 weeks out Johnny's was able to take my truck and fix it within a week! Very grateful for their professionalism. Rebecca was great she kept in contact with me and was very responsive. This was my first-time using Johnny's but not the last. Upon picking up my vehicle my wife and I were impressed with the cleanliness and decor of the store it was very welcoming and such a friendly staff. We will see you again soon for my wife's tires and service. Thank you again for turning a dilemma into such a positive experience. The McEnroe's
Kevin McEnroe
Verified Google Review
Explore our other auto repair services.
Squealing or grinding brakes? Complete brake inspection, pads, rotors, and fluid service for safe stopping power.
Learn moreAvoid getting stranded with professional battery testing, terminal cleaning, and replacement using reliable, warranty-backed batteries.
Learn moreFrom minor fixes to major overhauls, our ASE-certified mechanics diagnose and repair engine problems of all types and complexities.
Learn moreCommon questions about our fuel system repair.
Both drop pressure, so the difference is in how the system behaves under test. A restriction usually shows normal pressure that collapses when volume demand goes up, while a failing pump often can't build spec pressure at all. We measure it rather than swap parts to find out.
It's worth it for injectors that are dirty but still working, and it's a waste on injectors that have failed. We test the injectors first so you know which situation you're in. If cleaning won't help yours, we'll say so instead of running the service anyway.
It depends entirely on the vehicle. Some have a serviceable inline filter with a manufacturer recommended interval, and plenty of newer vehicles have a lifetime strainer inside the tank that only comes out with the pump. We go by what your manufacturer specifies for your car, not a blanket number.
For a vehicle that sits for long stretches, it helps, because ethanol blended fuel is what pulls moisture in. For a daily driver that burns through a tank every week or two, the fuel doesn't sit long enough for it to matter much. Buy it for the equipment and vehicles that sit, not out of habit.
Contaminated or watered down fuel usually causes running problems first, hard starting, misfires, and clogged injectors. Left alone long enough, a lean or misfiring condition can cause real damage downstream, including to the catalytic converter. Getting it diagnosed early keeps a fuel problem from turning into an engine problem.
ASE Certified Technicians
ASE certified techs working on your vehicle
Flexible Drop-Off Hours
Convenient service options
20+ Years
2 decades of trusted service
