Great customer service. Very knowledgeable diesel mechanics on staff.

If you have a diesel with any trouble, or you want to upgrade you motor, this is the place. They fixed an issue the dealer could not find. Then EFI tuned my motor. Ya hoo.

These guys really know what they are doing. My 2005 Duramax is safe in their hands.

The name implies they only work on diesel fuel systems but they can clean and test gas fuel injectors too... They have saved me hundreds of dollars!

Great people and great service.

Corey is great, diagnosed my truck over the phone basically, recommended a great shop to do the work, Powerstroke genius of the North East I swear

Great business with some of the most experienced staff in the industry. They also have great doughnuts!

I was having a issue with my 6bt Cummins, they were very helpful in getting the parts I needed to get machine up and running. I would definitely recommend these guys

Top notch service.

I had never had any work done here but I spoke with Corey multiple times just to ask him some questions and he had all the answers. He got me in immediately after my truck went into limp mode after a tcm replacement and program. He had his tech tune my truck and I was on my way in about a half an hour. Awesome experience and very thankful for the knowledge and quick service.

DONE RECORD TIME FAIR PRICE.

Great place for your diesel needs!

Absolute professionalism! Very friendly and knowledgeable staff. They even knew a thing or two about gas engines and there fuel treatment is absolute top shelf stuff run it in my gas rides every tank.

People are Aussom very helpful if you nead dicel Parts place to go

Injection pump failed on our 1983 Allis Chalmers farm tractor. Called a few places and Diesel Fuel Systems had the best price and the best turnaround time on a rebuild. Reggie had great customer service and was able to get us running again within a week. Very helpful and knowledgeable with any questions I had on timing etc.

Didnt want to really sell me what i wanted for a turbo. Told me it wouldnt work for my application. What i wanted and bought works just fine.

If you drive a diesel, you need to know these guys. Not only do they work on fuel systems, but they stock a full line of high quality oil and filters ( oil, fuel, transmission and air). They also have a chassis Dyno...

Great food, good bar selection, fast service and lots of space.

Excellent service. Awesome atmosphere, great performance!

Always promptly taken care of when our ambulances have issues these guys are right on top of their game!

Very knowledgeable and friendly

Great outfit to have work done on your diesels

All good people right here 👍

Love their service and promptness

The above statement from Jason Mallory is not about Diesel Fuel Systems in Bangor Maine, it is about another company in Arizona by the same name.DFS Bangor stands behind their work and employ only trained professionals, educated and experienced in the models of diesels on the road today.

We spent $1,000 for a tune that didnt help the truck as far as fuel mileage to haul our big trailer. He was always to busy when we would call him. Definitely has no clue when it comes to tuning a truck for hauling then they charged us another $300 for a turn down exhaust tip so it didnt blow smoke all over the trailer we were hauling. I might as well have thrown $1,300 in the fire pit. Now Carl has to take it to someone that knows what their doing and they only $600 for everything. So if your going to have a tune put in your truck do your homework Corey has no clue. He told us our 2015 dura max motor and tranny were worn out....lol.

Professionals who know what they do and do it right every time

They know their stuf

Receptionist has a very poor attitude.

Awesome service

Cant work on Duramax diesels. Gives excuses on the phone. Not worth the trouble