Common Rail Diesel Injector Testing & Rebuild Service
Common rail diesel injectors are the most precise and hardest-working parts in a modern diesel fuel system, and Valley Fuel Injection tests and rebuilds them the right way. This is a testing and rebuild service, not a pump: you ship us your injectors, we test each one on a common-rail test bench for actual delivery and response data, then rebuild or replace only the ones that fail. When an injector goes bad, testing and rebuilding your own set is almost always faster, cheaper, and better than blindly swapping in a full set of new injectors, and many original numbers are no longer available new. You get injectors matched to your engine, proven on the bench, with the real data to back it up.
The Valley Fuel Injection Difference
We are a rare breed. There are not many shops left in the country with the training, the certification, and the test equipment to rebuild a diesel injection pump to factory standard, and fewer still that do it at our level. This is not a cheap imported knockoff and it is not a throw-together seal-kit job. It is a genuine, certified, factory-spec rebuild, done by hand and proven on the bench before it ever leaves the building.
When you send a pump to Valley Fuel Injection, it is rebuilt by licensed, factory-certified diesel technicians, to the same standard the pump held the day it left the factory, and it is backed by a real warranty. That is the whole point of what we do.
Applications We Rebuild
We test and rebuild common rail injectors across hundreds of engine and equipment combinations. The most common we see:
| Engine / Equipment | Typical Applications |
|---|---|
| Dodge / Ram Cummins | 2003-present 5.9L and 6.7L common-rail injectors (0986435xxx, 0445120xxx) |
| GM Duramax | LB7, LLY, LBZ, LMM common-rail injectors |
| Ford Power Stroke | 6.7L Power Stroke common-rail injectors |
| Kubota / John Deere / Yanmar | Denso and Bosch common-rail injectors for ag and industrial engines |
| Heavy duty | Cummins ISX/QSX, ISC/ISL, and industrial common-rail injectors |
Do not see your engine? Call 530-668-0818 and we will confirm your injectors and walk you through the service.
Common Rail Injector Models We Rebuild
The common rail injector family spans thousands of part numbers across Bosch, Denso, and Delphi. These are some of the specific injectors that regularly come across our bench, most on Cummins, Duramax, and agricultural engines:
Dodge / Ram Cummins: 0986435503, 0986435505, 0986435518, 0986435573, 0 445 124 047
GM Duramax: 0986435502
Cummins industrial / heavy-duty: 2872331R, 0986435900
Kubota: 1J500-53076, 0 445 110 777
John Deere: AP52902
MAN: 0 445 120 203
Do not see your exact number? It does not matter. We test and rebuild every common rail injector variant Bosch, Denso, and Delphi ever built. Read the model number off the injector body, call 530-668-0818, and we will confirm it and quote your rebuild.
Any product image shown is a representative example. Your common rail injectors may differ in appearance by application, year, and configuration. We rebuild your exact injectors to their factory specification.
Signs Your Injectors Need a Rebuild
- Rough idle, misfire, or a cylinder that will not smooth out at idle
- Hard starting, long cranking, or a no-start when the engine is cold or hot
- White or black smoke that changes with load or throttle
- Excessive fuel return (leak-off) from one or more injectors
- Knocking, rattle, or a diesel knock that changes with fuel delivery
- Power loss, poor fuel economy, or failed balance rates on a scan tool
How We Rebuild Your Injectors
A Valley Fuel Injection rebuild is not a quick clean and a spray of carb cleaner. Every injector is tested, torn down, and built back to factory standard, one measured part at a time:
- Complete testing and teardown. Every injector is tested on a common-rail bench for opening pressure, spray, and delivery at multiple points. Failed injectors are disassembled and inspected against factory wear limits. Nothing is passed on assumption.
- Deep cleaning. Every part is ultrasonically and thoroughly cleaned so we are building on bare, spotless metal, not old varnish and carbon.
- Factory-certified replacement parts. Nozzles, control valves, seals, and internal components are replaced with genuine factory-certified parts for your specific common rail injector, never cheap generic substitutes.
- Nozzle and control valve service. The nozzle and control valve are serviced and set so spray pattern and fuel delivery are even and correct across the set.
- Calibration and testing on real machines. Each finished injector is calibrated on a professional, computer-controlled common-rail test bench to its exact factory specification. We prove opening pressure, spray, and delivery at every test point and give you the actual data before it ships.
That final step is what separates a real rebuild from a parts swap. Anyone can bolt in a nozzle. Very few shops can put your injectors on a bench, calibrate them to spec, and hand you the data to prove it.
Our Warranty
We control every step of the rebuild, so we stand behind it. Every pump and injector we rebuild carries a 1-year warranty. Electrical and electronic components are warrantied for 30 days. A healthy lift pump and clean, water-free fuel are essential to pump life, so we recommend fresh fuel filters at installation to protect your rebuild.
What Injector Testing Costs
Testing is where every job starts, and you can stop there if all you need is answers. We mount each injector on a common rail test bench and run it through the same points a factory would: delivery volume across the rpm range, response and opening pressure, return or leak-off flow, and spray pattern. You get real numbers on every injector, so you know exactly which ones are failing instead of throwing a full set of parts at a problem that lives in one or two.
Common Rail Injector Testing
$65 per injector
That is our standard bench-test rate. A set of 4 runs about $260, a set of 6 about $390, and a set of 8 about $520. You get a straight readout of what each injector is doing, and if you move forward with a rebuild we already know exactly what every unit needs.
Testing on its own makes sense when you have a running complaint you want pinned down, when only one or two injectors are suspect, or when you want hard data before deciding between rebuilding your cores and buying a reman set. Want us to just test and report back? Call 530-668-0818 or start an inquiry and ship us the set.
What a Common Rail Injector Rebuild Costs
Typical Rebuild Cost
$2,000 to $3,000 typical range
Most common rail injector jobs land between $2,000 and $3,000, with a typical job around $2,500. Injector work is priced per injector, and the range shown reflects a typical set of four to eight injectors. These are real figures from our recent common rail injector jobs, not markup guesses. Sets with more failed injectors, or that need full nozzle and control valve replacement, run higher. Because every job is priced on your injectors’ actual condition, we give you a firm quote after inspection, before any work begins.
Rebuild Your Cores, or Buy a Reman Set Outright
You have two ways to get running, and we do both. The right one depends on your injectors and how fast you need them.
| Your options | Best when | Typical cost, set of 6 |
|---|---|---|
| Test only, then decide | You want to know which injectors are actually bad before you spend on a rebuild or a new set | $65 per injector, about $390 for a set of 6 |
| Test and rebuild your cores | Your injectors are rare or discontinued, or you want your original injectors back on the truck | About $2,500, roughly $460 per injector |
| Buy a remanufactured set outright | Common Dodge and Cummins, Duramax, or Power Stroke injectors, and you want them fast | About $1,650 to $2,250, plus a refundable core charge |
For common applications, a remanufactured set is often both faster and less expensive than rebuilding your own cores. It ships ready to install, and you send your old injectors back for the refundable core credit. Shop our remanufactured injectors, or call 530-668-0818 and we will help you choose the right path.
Prices above cover the service and parts. Any applicable sales tax, plus shipping and small shop fees (such as a hazardous-waste disposal fee), are added at invoicing, so your quote reflects the full out-the-door number before any work begins. Buying tax-exempt? Qualifying diesel repair shops, fleets, farms, and agricultural operations can purchase tax-free. Set up tax-exempt purchasing by submitting your resale or exemption certificate once, and every qualifying order is tax-free going forward.
How It Works · Call for Pricing and Availability
Because every common rail injector rebuild is done on your own injectors, pricing depends on the injector’s condition and the parts it needs, so we quote each job individually. Here is the process:
- Call us with the numbers on your injectors so we can confirm they are common rail injectors and talk through your symptoms.
- Ship the injectors to us or drop them off. We test and tear them down, inspect them, and give you a firm quote before any work begins.
- We rebuild and bench-calibrate the injectors, then return them ready to install, backed by our warranty.
Call 530-668-0818 for pricing and turnaround, or start your rebuild online → and we will walk you through shipping it in.
Why Valley Fuel Injection
Valley Fuel Injection & Turbo is a full-service, factory-certified diesel fuel injection shop in Woodland, California, serving truck owners, farmers, fleets, and other repair shops across the country. We are a Bosch-authorized service center with the tooling, the test equipment, and the certification to test and rebuild common rail injectors correctly, and we have been doing it long enough to have seen just about every injector failure there is. When a shop cannot fix it, they send it to us. Ship your injectors from anywhere or visit us at our Woodland shop.
Want to understand what is going wrong before you send yours in? Read our common rail injector problems guide and our rundown of diesel injector failure symptoms.
Frequently Asked Questions
How much does common rail injector testing and rebuild cost?
Most common rail injector jobs run between $2,000 and $3,000, with a typical job around $2,500. Injector work is priced per injector, and that range reflects a typical set of four to eight injectors. Sets with more failed injectors, or that need full nozzle and control valve replacement, can run higher. Pricing depends on how many injectors fail testing and the parts they need, so we give you a firm quote after inspection, before any work begins. Call 530-668-0818 for current pricing.
Can I just have my injectors tested without a full rebuild?
Yes. Bench testing on its own is $65 per injector, so a set of six runs about $390 and a set of eight about $520. We put each injector through a full test cycle, then send you the numbers with a straight recommendation on which units are good, which need work, and whether a rebuild or a reman set is the smarter move for your setup. If you decide to move forward, that testing already tells us exactly what each injector needs. Call 530-668-0818 to get started.
Do I send you my injectors, or do you have a set in stock?
This is a testing and rebuild service for your own injectors. You ship us your set or bring it in, we test each injector on a common-rail bench, rebuild or replace the ones that fail, and send them back matched to your engine with the actual test data. Rebuilding your own injectors is usually faster and less expensive than buying a full set of new injectors, and many original numbers are no longer manufactured.
Should I rebuild my injectors or just buy a reman set?
For common Dodge and Cummins, Duramax, and Power Stroke injectors, buying a remanufactured set is usually both faster and less expensive than rebuilding your own cores, and you send your old injectors back for a refundable core credit. Rebuilding your cores makes sense when your injectors are rare or discontinued, you want your original injectors back, or you just want them tested to find which ones are bad. Call 530-668-0818 and we will help you decide.
How long does injector testing and rebuild take?
Turnaround depends on our current shop schedule and parts availability for your specific injectors. We give you an honest timeline when we quote the job. If you are down and need a fast turnaround, tell us when you call and we will do our best to prioritize it.
What warranty comes with the rebuild?
Every pump and injector we rebuild carries a 1-year warranty. Electrical and electronic components are warrantied for 30 days. We control every step of the rebuild in-house, from testing to final bench calibration, which is why we can stand behind it. A healthy lift pump and clean, water-free fuel are essential to injector longevity, so we recommend fresh fuel filters at installation to protect your rebuild.
My injector number is not on your list. Can you still rebuild it?
Almost certainly. Common rail injectors were fitted to far more equipment than we can list here. If it is a Bosch, Denso, or Delphi common-rail injector, we can very likely test and rebuild it. Call 530-668-0818 with the number stamped on the injector body and we will confirm.
Can I ship my injectors to you from out of state?
Yes. We test and rebuild injectors for customers nationwide. Remove your injectors, pack them securely, and ship the set to us. We test each one, quote the rebuild, and return them ready to install with the data to back it up.
Related products
$325.00
Call for Pricing
$325.00
Reviews
There are no reviews yet.