50038 Columbia River Hwy, Scappoose, OR · 25 minutes from Portland on Hwy 30OPEN MON–FRI 7:30–5:30 · Same-day answers, real person
Pro Automotive & Diesel
BOSCH CERTIFIED × 2Diesel fuel injection rebuild and install under one roof
(971) 298-9384
Ask for the fuel injection desk
2011–2016 Silverado & Sierra 2500HD / 3500HD

Your LML is running on a pump with a known ending.

The 2011–2016 LML uses the same CP4.2 that grenades fuel systems. The CP3 conversion puts back the pump GM ran for a decade before it — the one that simply does not do this.

2011–2016 Silverado / Sierra 2500HD & 3500HD
Proven Bosch CP3 — ten years of service record
Bosch certified rebuild + install under one roof
Fleet pricing and scheduling available
SEPTEMBER SALE — $4,499 installed, regular price $5,500. Offer ends September 30, 2026.
Call (971) 298-9384Get my quote → SEPTEMBER SALE · PRO AUTOMOTIVE & DIESEL · SCAPPOOSE OR REG $5,500 $4,499 INSTALLED THIS MONTH ONLY
FLAT PRICE, NO SURPRISES

Get your CP3 conversion quote

Tell us the truck and we’ll text you a firm out-the-door number.

We reply the same business day. No robocalls, no spam — one text or call from a real person in Scappoose.
Bosch certified rebuild & install — same roof
Authorized S&S Diesel & Alliant Power Master dealer
4.6 stars · 713 Google reviews
2-year warranty · 2-day typical turnaround
Fits2011–2013 LML2014–2016 LML2500HD3500HDDuallyFleet units
LML down with a fuel-system failure? Call now — we inspect, quote and get you a real answer today.

The failure, drawn outThe LML’s CP4 is lubricated by the fuel it pumps — until it isn’t

When the follower turns, the pump machines itself and sends the shavings forward: injectors, rails, lines, tank. On a truck this age that $15,000-plus repair is often worth more than the payoff.

WHAT HAPPENS WHEN THE CP4.2 COMES APARTFUEL TANKcontaminatedLIFT PUMPpushes debrisCP4.2 PUMPmachines itselfFUEL RAILSmetal arrives8 INJECTORSscored, junk$15,000+ repairAFTER THE CONVERSIONFUEL TANKcleanLIFT PUMPnormal dutyBOSCH CP3self-lubricatedFUEL RAILSprotected8 INJECTORSuntouched$4,499 installed, one visit
Top row: the path debris takes once the pump starts machining itself. Bottom row: the same truck after the conversion.
WHAT IT COSTS EITHER WAY $4,499 in September sale price, installed — offer ends September 30 $5,500 regular price what the same conversion costs from October on $15,000+ after the pump fails plus 2–4 weeks down A grenaded CP4 takes the pump, injectors, rails, lines and tank with it — dealer replacement runs $15,000 and up. Our own cleanup tickets have billed $5,218 and $7,669 on top of the conversion once metal moved through the system. Prevention is a fraction of the cleanup — and the cleanup is not optional once it happens.

Why do itThe cheapest insurance a 2011–2016 Duramax can buy

The CP3 conversion goes back to the pump GM used from 2001 to 2010 — a design with a service record long enough that nobody argues about it. It is the most proven fuel-system upgrade in the diesel world, and on the LML it is a straightforward, well-documented job.

  • Proven Bosch CP3 pump — the CP4 failure mode simply is not there
  • More fuel volume on tap if you tow heavy or add power later
  • Keeps emissions equipment and factory calibration in place
  • Same-roof Bosch certified rebuild and install — your parts never leave
  • Fleet pricing on three trucks or more
SEPTEMBER SALE · ENDS SEPT 30
LML CP3 CONVERSION, INSTALLED · SEPT SALE
Regular $5,500SAVE $1,001
$4,499
Complete: CP3 pump, conversion kit, fluids, labor, road test
Fleet pricing on three trucks or more. Financing available over $1,000. If the pump has already failed, the fuel-system cleanup (tank, lines, injectors) is quoted separately after inspection. $4,499 is the conversion on a running truck. September sale: $4,499 installed, regular $5,500 — offer ends September 30, 2026.
LML Duramax Silverado 2500HD
Our bays on Highway 30 in Scappoose — where the CP3 conversion happens.
THE KIT WE INSTALL

The S&S LML CP3 conversion — the 50-state kit

AUTHORIZED
S&S DIESEL DEALER

S&S built the first CARB-compliant 50-state CP3 conversion for the LML, and that is the kit we fit. It carries an Executive Order number, needs no tuning changes, and leaves every factory emissions component exactly where GM put it — which is why it passes DEQ and why your insurance and warranty conversations stay short.

The S&S LML CP3 conversion — CARB EO #D-756-4.
Bosch CP3 for the Duramax — the pump that replaces the CP4.2.
Inside a failed CP4: this is what sends metal downstream.
S&S LML CP3 CONVERSIONCARB EO #D-756-4 · 50 STATE

LML Duramax CP3 Conversion, CARB compliant

S&S Diesel Motorsport® — bulletproof Bosch CP3 in place of the CP4.2

  • CARB Executive Order #D-756-4 — legal in all 50 states, DEQ friendly
  • All hardware to replace the CP4.2 with a proven Bosch CP3
  • No tuning changes required; factory emissions equipment stays in place
  • Fits 2011–2016 Silverado / Sierra 2500HD and 3500HD LML Duramax
  • Installed and warrantied here — the pump never leaves the building
S&S lists the 50-state kit at $2,600 and two competition versions at $1,780 and $2,175. We quote the 50-state kit by default because a street truck in Oregon should not be running a competition part.
Kit photography courtesy of S&S Diesel Motorsport®. We are an authorized dealer — every kit is bought new from S&S, installed here, and warrantied here.

Why hereNobody knows your fuel system better than we do

Most shops send your pump away and hope. We are a Bosch certified diesel fuel injection rebuild facility under the same roof as a Bosch certified install facility — the bench and the bay are twenty feet apart, and the same people run both.

Bosch certified, twice over

Rebuild bench and install bay under one roof — the same techs test the pump and put it in your truck.

Authorized dealer

Authorized S&S Diesel Motorsport and Alliant Power Master dealer — genuine parts and real warranty coverage.

4.6

713 reviews, 4.6 stars

Twenty years in Scappoose, serving Portland, Vancouver, St. Helens and the lower Columbia.

What you getEverything in the flat price

  • Bosch CP3 pump and complete conversion kit
  • Lines, fittings, bracket and hardware — nothing improvised
  • Full fuel-system inspection before any parts go on
  • New filters and fluids, system primed and bled
  • Road test and a printed test report from our own bench
  • Two-day typical turnaround; loaner and shuttle available

How it goesFour steps, one shop, nothing shipped out

1CALL OR TEXTThree questions and you get a realnumber, not a range.2INSPECTFuel sample first. If debrisalready moved, you know before westart.3CONVERTBosch certified tech installs it;the pump is tested on our ownbench.4ROAD TESTPrinted test report, warranty inhand, keys back — usually twodays.

Our own bays and benchTwenty feet from the bench to the bay

Bosch CP3 and CP4 pumps on our own bench in Scappoose.
Injectors off a contaminated LML. This is the aftermath the conversion prevents.
Customer LML Duramax in for its CP3 conversion.
Injection pump work on our own bench — measured, not guessed.
Pump detail: the conversion is a swap, not a delete.
Calibrated Bosch test equipment — every pump leaves with a printed test report.
50038 Columbia River Hwy, Scappoose — 25 minutes from Portland.
“Third LML we’ve had converted here. Zero drama, real quote, truck back when they said.”Google review · Pro Automotive & Diesel, Scappoose

Straight answersQuestions we get every week

Is the CP3 swap legal and DEQ friendly?Yes — it keeps every emissions component in place. It is a pump conversion, not a delete.
Why not just install another CP4?Because you would be buying the same ending on a schedule you do not control. The CP3 is the design GM ran for ten years without this failure.
My pump hasn’t failed. Is it worth doing?Prevention runs about a third of the cleanup, and the cleanup is not optional once it happens.
What if it already failed?We sample the fuel and inspect first, then quote the tank, lines and injector work separately so you see the real number up front.
How long do you need the truck?Two days is typical. Fleet trucks go back-to-back.
Do you take trucks from Portland and Vancouver?Every week — 25 minutes out Highway 30, shuttle and loaner available.
Call (971) 298-9384Send my details →
LML CP3 conversion — September sale $4,499 installed (reg $5,500), 2-day turnaroundCall (971) 298-9384