Cummins 4003580 — Genuine P7100 Pump Rear Support Bracket (Fuel Pump Brace)

MPN: 4003580  |  Also Known As: fuel pump brace, P7100 pump mounting support block, “T-block” mount

Stabilize your P-pump the OE way. The genuine Cummins 4003580 fuel pump brace is the factory rear support that ties the Bosch P7100 injection pump to the engine, reducing vibration and stress on the timing case. It’s the direct-fit bracket used on 1994–1998 Ram 2500/3500 5.9L 12-valve applications and on B-Series industrial engines.

Features & Benefits

• OE geometry to correctly support the P7100 and prevent pump “bounce.”
• Reduces load on the front timing case/gear housing to help avoid cracks and leaks.
• Direct-fit bracket—no drilling or spacers when used with the factory P7100 setup.
• Ideal for maintenance & swaps (P-pump conversions) where a proper rear support is required.
• Genuine Cummins part for traceable quality and fitment.

Verified Fitment (Automotive)

Industrial/Off-Highway: Cummins catalogs 4003580 as a Fuel Pump Brace used primarily on B5.9 Tier/Euro I–II engines—verify by ESN for equipment engines.

Specifications

• Type: Rear support bracket / fuel pump brace for Bosch P7100
• OE Part Number: 4003580
• Location: Under/rear of P7100, ties pump to cylinder block
• Hardware: Bracket only; mounting bolts not included
• Quantity Required: 1 per engine

Often Paired With

• Block-side support bracket: Cummins 3928898 (mates with the P7100 and block)
• P7100 mounting hardware kit (studs/nuts/washer & O-ring for pump install)
• P-pump conversion parts (for VP44 trucks): gear case, lines, throttle linkage kits

What’s In The Box

• (1) Genuine Cummins P7100 Fuel Pump Brace / Rear Support Bracket (4003580)

Installation Tips

• Support the pump, dry-fit the brace, then torque fasteners to spec.
• Route harness/lines clear of the bracket; verify no contact through engine movement.
• After install, check for leaks at the timing case and verify stable idle/tach.

FAQ

WILL THIS FIT MY 1994–1998 12-VALVE RAM?

Yes—this is the OE rear support for the Bosch P7100 on 1994–1998 5.9L 12-valve trucks.

IS THIS THE SAME AS THE “PUMP MOUNTING SUPPORT BLOCK”?

Yes—many catalogs call 4003580 a pump mounting support block, “T-block,” or fuel pump brace.

DO I NEED ANYTHING ELSE?

We recommend the block-side bracket 3928898 and a P7100 hardware kit (studs/nuts & seals) if your originals are worn or missing.

DOES THIS WORK FOR P-PUMP CONVERSIONS?

Yes—proper rear support is required for VP44-to-P7100 swaps. Use with the correct gear case and lines.

IS THIS A GENUINE CUMMINS PART?

Yes—OE Cummins 4003580.