Bosch & Zexel PFR Inline Diesel Injection Pump Rebuild Service
The PFR pump is the small, flange-mounted inline injection pump that sits on the side of nearly every compact diesel — Kubota, Yanmar, Hatz, Shibaura, Mitsubishi, and countless gensets, welders and industrial engines. Built by Bosch and Zexel (and licensed to Kubota, Denso and others), it comes in one, two, three and four-cylinder versions (PFR1K, PFR2K, PFR3K, PFR4), with a separate pumping element for each cylinder driven off the engine’s own camshaft. When a PFR wears out or starts weeping fuel, a proper rebuild is almost always cheaper and better than hunting down a new pump that may be discontinued. We rebuild your own core, element by element, and calibrate it on the test bench so it goes back matched to your engine.
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
The PFR family powers tens of thousands of compact and industrial diesels. The most common we see:
| Engine / Brand | Typical Applications |
|---|---|
| Kubota | D722, D902, D1005, D1105, V1505, V2203, V2403 — B, L and M-series compact tractors, RTV/skid steers, mowers, gensets |
| Yanmar | 2T, 3T and 4T-series small diesels — compact tractors, gensets, marine and equipment |
| Hatz | 1B, 2G, 3M single and multi-cylinder air-cooled industrial diesels (PFR1K / PFR2K / PFR3K) |
| Onan / Military Gensets | Single-cylinder PFR1K on Onan and MEP-016B / MEP-701A generators and welders |
| Shibaura / Mitsubishi / Isuzu | Compact-tractor, skid-steer, forklift and industrial diesels |
Do not see your engine here? PFR pumps were fitted to far more equipment than we can list. Call 530-668-0818 and we will confirm your application.
Common PFR Models We Rebuild
PFR pumps are named for their element count — PFR1K (one cylinder), PFR2K (two), PFR3K (three), PFR4 (four) — followed by a plunger and configuration code. These are the families that regularly cross our bench:
Single-cylinder: PFR1K series (e.g. PFR1K70, PFR1K90, PFR1K80A505 / Bosch 0414181033 — Onan / MEP gensets)
Two & three-cylinder: PFR2K and PFR3K series (Kubota D722 / D902 / D1105, Hatz, Shibaura) · Zexel NP-PFR3MD50 · PFR-KD
Four-cylinder: PFR4 / Zexel 104134-, 104135- and 104139- series (e.g. 104135-4032, 104139-4041)
Kubota-numbered: 15321-51010 and 16006-series pump assemblies
Do not see your exact number? It does not matter. If it is a PFR-style inline pump, we rebuild it. Read the number off the pump body or the tag, call 530-668-0818, and we will confirm it and quote your rebuild.
Any product image shown is a representative example. Your PFR pump may differ in appearance by cylinder count, brand and configuration. We rebuild your exact pump to its factory specification.
Signs Your PFR Pump Needs a Rebuild
- Diesel weeping or leaking from the pump body, element flanges, or delivery-valve holders (usually hardened, brittle O-rings)
- Fuel diluting the engine oil — rising oil level with a diesel smell, a classic failed-PFR symptom
- Hard starting, long cranking, or no-start when cold
- Loss of power, low top speed, or one cylinder down from a worn element
- Excessive smoke, rough idle, or governor hunting and surging
- Water or contaminated fuel run through the pump
How We Rebuild Your PFR Pump
A Valley Fuel Injection rebuild is not a seal kit and a coat of paint. Every pump is torn completely down and built back to factory standard, one measured element at a time:
- Complete teardown and inspection. We disassemble the pump and inspect every element, delivery valve, and the governor and control rack against factory wear limits. Nothing is reused on assumption.
- Deep cleaning. Every part is ultrasonically and thoroughly cleaned so we build on bare, spotless metal, not old varnish and debris.
- Factory-certified replacement parts. Plunger-and-barrel elements, delivery valves and springs, control-rack and governor components, and a complete O-ring and seal kit. We replace what needs replacing with genuine factory-certified Bosch / Zexel components, never cheap generic substitutes.
- Element matching and rack service. On multi-cylinder pumps we match element delivery cylinder to cylinder and free up and set the control rack so every cylinder gets the same fuel.
- Calibration and testing on real machines. The finished pump is mounted on a professional, computer-controlled Bosch test bench and calibrated to your pump’s exact factory specification — delivery, balance and timing set and proven before it ships.
That final step is what separates a real rebuild from a parts swap. Anyone can bolt in an O-ring kit. Very few shops can put your pump on a bench, calibrate it to spec, and stand behind the result.
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 a PFR Pump Rebuild Costs
Typical Rebuild Cost
$650 to $1,450 typical range
Most PFR rebuilds land between $650 and $1,450 depending on cylinder count and wear — a single-cylinder reseal at the low end, a worn three or four-cylinder pump needing new elements at the top. Because every rebuild is priced on your pump’s actual condition, we give you a firm quote after inspection, before any work begins.
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 PFR rebuild is done on your own core, pricing depends on the pump’s condition and the parts it needs, so we quote each job individually. Here is the process:
- Call us with the number on your pump so we can confirm it is a PFR and talk through your symptoms.
- Ship the pump to us or drop it off. We tear it down, inspect it, and give you a firm quote before any work begins.
- We rebuild and bench-calibrate the pump, then return it 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 rebuild inline pumps correctly, and we have rebuilt more small PFR pumps than we can count. When a shop cannot fix it, they send it to us. Ship your pump from anywhere or visit us at our Woodland shop.
Frequently Asked Questions
How much does a PFR injection pump rebuild cost?
Most PFR rebuilds run between $650 and $1,450 depending on how many cylinders the pump has and how much wear it carries — a single-cylinder reseal at the low end, a three or four-cylinder pump needing new elements at the top. Pricing depends on the condition of your pump and the parts it needs, so we give you a firm quote after inspection, before any work begins. Call 530-668-0818 for current pricing.
My Kubota is leaking diesel into the engine oil. Is that the pump?
Very often, yes. On Kubota and other small PFR-pumped engines, hardened O-rings on the pump elements let diesel seep past and drain down into the crankcase, raising the oil level and thinning the oil. It is one of the most common PFR failures we rebuild. Catch it early — fuel-diluted oil accelerates engine wear. Call us with your pump number and we will confirm.
Do I send you my pump, or do you have one in stock?
This is a rebuild service for your own core. You ship us your pump or bring it in, we rebuild and recalibrate it, and we send it back matched to your engine. Rebuilding your core is usually faster and less expensive than sourcing a new pump, and many PFR pumps are no longer manufactured.
How long does a rebuild take?
Turnaround depends on our current shop schedule and parts availability for your specific pump. 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 teardown to final bench calibration, which is why we can stand behind it.
My pump number is not on your list. Can you still rebuild it?
Almost certainly. PFR pumps were fitted to far more equipment than we can list here. If the pump is a PFR-style inline pump, we can rebuild it. Call 530-668-0818 with the number stamped on the pump and we will confirm.
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