Fuel Systems Service in Houstin, TX

A properly maintained fuel system is essential to top performance.

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Fuel Tank Problems & Repair

Delamination and leakage, injector pump failures and fuel filter problems, the list of diesel fuel tank issues goes on and on.

Whether your repair is covered through warranty, insurance, recall, or not covered at all, fuel tanks issues can be a major headache. Besides, with rising fuel prices, no one wants to waste money on fuel they don't even get to use.

Tank Upgrades

DOUBLE your truck's fuel capacity.

Most diesel trucks tanks range between 75L - 100L tanks but doing a fuel tank upgrade can increase your capacity to almost 200L of fuel.

Sure, it's a mod you can't see from the street but you'll appreciate it when your stops at the pump drop in half.

Steel diesel fuel tank upgrade
F-350 SuperDuty fuel tank upgrade to 190L.

Injectors and Pumps

Servicing and testing diesel fuel injectors is a decently complicated process. Sure, there are a lot of types of diesel fuel injectors but we typically see two main types: mechanical (older) injectors which are less complex and common rail injectors that are more sophisticated.

One important note: common rail injectors can't handle poor quality fuel very well (which can be the source of problems).

We see people upgrade their injectors all the time and then continue running the same diesel they've always run. If you're doing an upgrade, you need to look at upgrading your fuel quality too.

Diesel fuel injectors laid out neatly on a table in the shop.
Diesel truck fuel injectors being cleaned and repaired.

Signs Your Diesel Fuel Injectors Need Service

Sign #1 — Smoking Engine

If your engine is smoking or just running rough in general, it might be time bring it in for service. We'll do an inspection and advise you on whether or not you need cleaning, repair, or replacement.

Sign #2 — Diesel Filter Regen

If your truck's diesel filter is regenerating more than usual, it might be time for a service on your fuel injectors. Remember, preventative maintenance is ALWAYS cheaper in the long run. Don't put off a problem you can fix today for a bigger one tomorrow.

Important Note: Don't Service Injectors Yourself

No matter what you read on that blog or what your buddy Dave said, it's almost impossible to get the precision and accuracy necessary to test diesel fuel injectors without the right testing equipment.

Call The Shop

Have a pressing issue and need to talk to someone right away? Give us a call and we'll help you walk through your problem and find the right solution.

+1 832-707-8577
2019 F350 getting ECM tuning serviceFord and GMC getting oil changes in the shopFront view of Longhorn Diesel in Texas with 2 lifted diesel trucks out frontFlatbed Ram 3500 HD getting suspension service

Customer Reviews

"Longhorn Diesel was suggested to me by another service provider that didn’t have the equipment needed to perform the repairs my 3500 Dodge needed. First let me say they kept me informed, were fair on price and got my vehicle back to me in a timely manner. They were professional and had my truck back to me in pristine condition while finding other issues that were not identified. They also sent me video of the issue showing me the required work done and new issue identified."
William Rogers
Dodge Ram 3500
Easily the top diesel mechanic in Houston.  Denmar and Longhorn Diesel have serviced my truck (2015 Duramax) for 2+ years, and the work, service, communication and pricing are excellent.  This is the only place I trust with my truck.  I highly recommend Longhorn Diesel!  Many thanks to you and your team, Denmar!
J. Wayne Ballew
Dodge Ram 3500
These guys do awesome work, Denmar is a honest gentleman & takes time out with each & every one of his customers. They went above & beyond of what I paid for, to make sure my truck was in safe & good operating condition at no additional charge! As I'm not looking forward to any more repairs, when that time does come again I will definitely be right back at Longhorn Diesel👍🏼!
Jay Lampkins
GMC Sierra
After about 10 shops telling me no or giving me an unrealistic price. I came across Longhorn Diesel. I called Denmar and he was very down to earth and you can tell by how he talks that he isn’t your typical diesel mechanic. He genuinely took the time to get my truck right as well as him and I having a great conversation sharing what we both love to do. I would 110% recommend him to everybody I know of. Down to earth guy. Great business. Fair pricing. All around great business and I will be back.
Cole Heferle
Dodge Ram
After about 10 shops telling me no or giving me an unrealistic price. I came across Longhorn Diesel. I called Denmar and he was very down to earth and you can tell by how he talks that he isn’t your typical diesel mechanic. He genuinely took the time to get my truck right as well as him and I having a great conversation sharing what we both love to do. I would 110% recommend him to everybody I know of. Down to earth guy. Great business. Fair pricing. All around great business and I will be back.
Cole Heferle
Dodge Ram

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