3857533 Relay | Genuine Volvo Penta Part

🔧 Product Description

Genuine Volvo Penta fuel pump relay from the Other Electrical Equipment group, weighing 40.8 grams and listed for 51 DPX applications. It supersedes 3850403.

🚤 Compatibility

• Engine Family: DPX

Full model list at the end of this description.

⚙️ Key Features

• Fuel pump relay
• 40.8 g
• 51 DPX applications
• Supersedes 3850403
• Quantity varies by assembly, most commonly one

🔌 Function

Switches the heavy fuel pump current on a light control signal, so the pump can be commanded by the engine management and cut when it should be.

⚠️ Common Signs of Failure

• Engine will not start, or cuts out with no pump noise when the ignition is turned on
• Intermittent starting that improves if the relay is tapped
• Relay clicks but the pump does not run
• Contacts pitted or the case discoloured by heat
• Buzzing or chattering from the relay instead of a single clean click

🛠️ Service Notes

• Swapping in a known-good relay is the quickest confirmation, but check the socket terminals too, as a burnt socket will kill the new relay as well
• This relay feeds the fuel pump, so treat it as part of the fuel system and isolate the battery before working on it

🔄 Supersession & Cross Reference

OEM Supersession Chain

• 3857533 → Supersedes 3850403 → Supersedes 3852259

OEM / Related Numbers

• 3850403 earlier number superseded by this part
• 3852259 earlier number superseded by this part

Aftermarket / Verified Equivalents

• Recmar: REC3857533

📦 Condition

• Genuine Volvo Penta part
• Brand new
• Supplied in original or equivalent packaging

🔎 Full Model Compatibility

Typically suits:

• Volvo Penta 7.4GiPBYCCE, 7.4GiPWTR, 7.4GSiPBYCCE, 7.4GSiPWTR, 5.7GSiPWTR, 5.7GSiI-A, 5.7GSiPBYCCE, 5.7GSPBYC, 5.7GSPEFS, 5.7GSPWTR, 5.7GXi-A, 5.7GXi-B, 5.7GXiI-A, 5.7GXiI-B, 5.7Gi-A, 5.7GiI-A, 5.7GL-A, 5.7GL-B, 5.7GL-C, 5.7GL-D, 5.0GiPBYCCE, 5.0GiPWTR, 5.0GL-A, 5.0GL-B, 5.0GL-C, 5.0GL-D, 5.0GLPBYC, 5.0GLPEFS, 5.0GLPWTR, 5.0GXi-A, 4.3GIJBYA, 4.3GIPBYCCE, 4.3GIPWTRCE, 4.3GiJWTR, 4.3GL-A, 4.3GL-B, 4.3GL-C, 4.3GLPBYC, 4.3GLPEFS, 4.3GLPWTR, 4.3GSPBYC, 4.3GSJBYA, 4.3GSPWTR, 4.3GSJWTR, 4.3GXi-A, 8.2GSiPBYCCE, 8.2GSiPWTR
• Volvo Penta DPX385XBYDCE, DPX385XEFS
• Volvo Penta DPX415XEFS, DPX415XBYDCE