Cummins PTG-AFC Fuel Pump Rebuild Service
The Cummins PTG-AFC is the gear-driven fuel pump at the heart of the Cummins PT (pressure-time) fuel system, feeding the PT injectors on the Big Cam 855, NTC, mechanical N14, and KT/KTA engines, and Valley Fuel Injection has been doing Cummins PT fuel pump rebuild work the right way for decades. In a PT system, the fuel pressure and flow the pump delivers are what meter the engine’s fueling, so a worn pump does not just leak or whine: it shows up as hard starting, low power, surging, and smoke. When a PTG-AFC is tired, a proper rebuild of your own core, calibrated on a real PT test stand to the Cummins spec for your engine, beats gambling on a mystery exchange pump every time. We rebuild your pump, prove it on the stand, and send it 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 Cummins PT pump to factory standard, and fewer still that do it at our level. This is not a mystery exchange unit and it is not a throw-together reseal job. It is a genuine, certified, factory-spec rebuild, done by hand and proven on the test stand before it ever leaves the building.
When you send a pump to Valley Fuel Injection, it is rebuilt by licensed, factory-certified diesel technicians, calibrated to the Cummins specification for your engine, and backed by a real warranty. That is the whole point of what we do.
Applications We Rebuild
The PTG-AFC fed some of the hardest-working Cummins engines ever built. The most common we see:
| Engine / Equipment | Typical Applications |
|---|---|
| Cummins Big Cam 855 | Big Cam I-IV and NTC 855 over-the-road and vocational trucks |
| Mechanical N14 | Pre-Celect mechanical N14 truck engines |
| KT / KTA industrial | KT19, KTA19, and larger industrial and oilfield engines |
| Gensets & marine | 855 and K-series stationary and marine power |
Common PT Pump Models We Rebuild
These are the PT pump configurations that regularly come across our bench:
PTG-AFC: Big Cam 855 / NTC / mechanical N14 truck engines
PTG-AFC/RX: Exchange-style rebuilds on customer cores
Not sure exactly what pump is on your engine? It does not matter. Read the tag on your pump, call 530-668-0818, and we will confirm it and quote your rebuild.
Signs Your PT Pump Needs a Rebuild
- Hard starting or long cranking, hot or cold
- Low power, sluggish acceleration, or poor throttle response under load
- Surging or hunting at governed rpm
- Low fuel pressure measured at the rail fitting
- AFC trouble: black smoke, or flat no-boost fueling that never comes in
- Fuel leaks at the throttle shaft or the front seal
How We Rebuild Your PTG-AFC
A Valley Fuel Injection rebuild is not a reseal and a coat of paint. Every pump is torn completely down and built back to factory standard, one measured part at a time:
- Complete teardown and inspection. The gear pump, pulsation damper, throttle shaft, and governor all come completely apart, and every component is inspected against wear limits. Nothing is reused on assumption.
- Deep cleaning. Every part is thoroughly cleaned so we are building on bare, spotless metal, not decades of varnish and debris.
- Governor service. The governor plungers, weights, and springs are inspected and replaced as needed, so the pump holds its rated speed instead of surging at governed rpm.
- AFC and seal service. The AFC barrel, plunger, and bellows are serviced so boost-referenced fueling works the way Cummins intended, and a new front seal goes in.
- Calibration and testing on a real PT test stand. The finished pump is mounted on a PT test stand and calibrated for fuel pressure and flow against the Cummins CPL specification for your engine, and proven before it ships.
That final step is what separates a real rebuild from a parts swap. Anyone can reseal a PT pump. Very few shops can put it on a stand, set fuel pressure and flow to the CPL spec, and stand behind the result.
Our Warranty
We control every step of the rebuild, so we stand behind it. Every pump we rebuild carries a 1-year warranty on the pump rebuild. Electrical and electronic components are warrantied for 30 days. Clean, water-free fuel is essential to pump life, so we recommend fresh fuel filters at installation to protect your rebuild.
What a Cummins PT Pump Rebuild Costs
Call for Pricing · Quoted After Inspection
We do not publish a flat price for PTG-AFC rebuilds, and there is a good reason: honest pricing depends on what teardown reveals. The condition of the gear pump, the governor internals, and the AFC section varies widely from core to core, and so do the parts each pump needs.
Instead of quoting a number that may not match your pump, we tear it down, inspect it, and give you a firm quote before any work begins. You approve the price before we turn a wrench. Call 530-668-0818 and we will walk you through it.
Your quote covers 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 PTG-AFC 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 information on your pump’s tag and your engine, whether it is a Big Cam 855, NTC, mechanical N14, or a KT/KTA, 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 the pump and calibrate it on the PT test stand, 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 have the tooling, the PT test stand, and the certification to rebuild Cummins PT pumps correctly, and we have been doing it long enough to have seen just about every way a PTG-AFC can fail. When a shop cannot fix it, they send it to us. Ship your pump from anywhere or visit us at our Woodland shop.
Chasing a driveability problem and not sure the pump is to blame? Timing and fueling symptoms overlap more than most people expect. Read our injection pump timing symptoms guide to help sort out what your engine is telling you before you send anything in.
Frequently Asked Questions
How much does a Cummins PT fuel pump rebuild cost?
We quote every PTG-AFC rebuild individually, after inspection. Pricing depends on what teardown reveals: the condition of the gear pump, the governor internals, and the AFC section, and the parts your specific pump needs. Rather than publish a number that may not match your pump, we tear it down, give you a firm quote before any work begins, and only proceed with your approval. Call 530-668-0818 for a quote.
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 PTG-AFC from anywhere in the country or bring it to our Woodland, California shop. We tear it down, quote the rebuild, then calibrate it on the PT test stand and send it back matched to your engine. We also handle exchange-style PTG-AFC/RX rebuilds on customer cores. Either way, the pump is proven on the stand before it ships.
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 your truck or equipment is down and you 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 we rebuild carries a 1-year warranty on the pump rebuild. Electrical and electronic components are warrantied for 30 days. We control every step in-house, from teardown to final calibration on the PT test stand, which is why we can stand behind the work. Clean, water-free fuel is essential to pump longevity, so we recommend fresh fuel filters at installation to protect your rebuild.
What makes a Valley Fuel Injection rebuild different from an exchange pump?
Most shops swap in an exchange unit and hope. We rebuild your pump: complete teardown of the gear pump, pulsation damper, throttle shaft, and governor, service of the governor plungers, weights, and springs and the AFC barrel, plunger, and bellows, plus a new front seal. Then the pump is calibrated for fuel pressure and flow on a PT test stand against the Cummins CPL spec for your engine and proven before it ships, backed by our 1-year warranty.
What are the signs of a worn PTG-AFC pump?
The classic symptoms are hard starting, low power, poor throttle response, and surging at governed rpm. Low fuel pressure measured at the rail fitting points at the pump, and AFC trouble often shows up as black smoke or flat, no-boost fueling that never comes in. Fuel leaking at the throttle shaft or the front seal is another giveaway. If your engine is doing any of this, call 530-668-0818 and we will help you narrow it down.
Which engines use the PTG-AFC fuel pump?
We see the PTG-AFC on Cummins Big Cam I-IV and NTC 855 over-the-road and vocational trucks, on pre-Celect mechanical N14 truck engines, and on KT19, KTA19, and larger industrial and oilfield engines. It also feeds 855 and K-series stationary and marine power, including gensets. If you are not sure what your engine is running, call us with what is on the pump tag and we will confirm it.
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