Complete new genuine Stanadyne DB2 Injection Pump that directly replaces the DB2-4911 mechanical injection pump primarily seen on 200HP 1992 and 1993 C/K 2500 and 3500 series 6.5L Turbo Diesel applications.
This pump features some updates not seen on original pumps. This updated pump assembly comes with new hardened steel advance piston bore and matching piston to greatly improve the life of the automatic timing advance system used on these pumps (that is all gone usually on 100k up mile pumps). The pump also features an updated top cover assembly that reduces the chance of air-leaks from the top cover or water and moisture leaking inward. This pump also features the updated head/rotor assembly to fix the issues that plagued the 4911 units leading to a hot-no-start issue or hot-hard-start problem with no glow plugs when warm.
Boxed Pump Offering
These are new injection pumps, that have been built and calibrated by Stanadyne. With the OE Boxed offering we do not test-run the pump. Warranty coverage is handled completely by an authorized Stanadyne shop should an issue be encountered after the installation. Unique Diesel does not provide facilitate warranty services on units sold as a Boxed unit. Should warranty services for a Boxed unit be requested please note that handling charges will occur to handle the processing of a Boxes unit through an authorized Stanadyne shop.
Test-Run Pumps & Fuel Settings
The pump is run, verifying fuel delivery, pressures, and advance. If out
of spec, it's corrected. Fueling increases also affect timing advance which are corrected back to spec with the increased fuel output. Warranty services on tested pump are handled by Unique Diesel in the future should problems occur. Please allow 2-weeks from order to shipment for testing and calibration procedures to complete.
OE tested
We take the pump and test-run the pump, no changes are made to the fuel delivery except to place the fuel delivery in the middle of the range if necessary. This selection just verifies that the pump is setup correctly and everything is working as it's supposed to before being shipped.
OE test bump
The acceptable fuel range is + or - 1.5cc, calibration preference is in the middle, some are on the bottom some are near the top (total range from low to high is 3cc). This option sets at the top of the range.
5cc test bump
This is an acceptable increase for stock trucks with an adjustable wastegate controller to increase the turbo pressures for the additional fueling, while monitoring intake manifold pressure and exhaust temps with a pyrometer.
10cc test bump
This increase is near the maximum delivery this pump will provide in stock form. This fuel rate should be accommodated on truck with turbo with adjustable wastegate controller or aftermarket turbo, a boost gauge, exhaust temperature gauge, and larger exhaust system.
Pumps with OE bump and modified fuel rates carry a 6-month warranty through Unique Diesel.
Fueling Increase options are bumps in the stock fuel curve, where we take the median stock fueling set-point and increase that value by the amount selected on the checkout. This is simply a calibration, as pump is not taken apart and modified.
*** Please note, as this typically goes without saying but end-user
modification (opening the pump, changing fueling etc.) voids all
warranty on the unit.
