{"product_id":"fuel-injector-lines-fit-1989-91-cummins-engine-12v-5-9l-3960783-3960784","title":"Fuel Injector Lines Fit 1989 91 Cummins Engine 12V 5.9L 3960783 3960784","description":"\u003cstrong\u003eThis Fuel Injector Lines set is a set of fuel injector lines compatible with 1989–1991 Cummins 12V 5.9L engines and matches OEM Part# 3960783, 3960784.\u003c\/strong\u003e\u003ch2\u003eProduct Overview\u003c\/h2\u003e\u003cp\u003eThese fuel injector lines are engineered to deliver high-pressure fuel to the injectors on 1989–1991 Cummins 12V 5.9L diesel engines. They precisely replace OEM parts 3960783 and 3960784, ensuring proper fuel timing and flow. This set is intended for diesel mechanics and owners of Dodge Ram trucks and other vehicles equipped with the 5.9L 12V Cummins engine.\u003c\/p\u003e\u003ch3\u003eKey Features \u0026amp; Performance\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eBent and flared to OEM specifications for leak-free sealing\u003c\/li\u003e\n\u003cli\u003eConstructed from heavy-duty steel tubing to withstand high injection pressures\u003c\/li\u003e\n\u003cli\u003eIncludes both injector line assemblies matching OEM 3960783 and 3960784\u003c\/li\u003e\n\u003cli\u003eDirect bolt-on replacement—no modifications required on factory fuel systems\u003c\/li\u003e\n\u003cli\u003eRestores idle quality and acceleration by ensuring even fuel delivery\u003c\/li\u003e\n\u003cli\u003eCorrosion-resistant coating for long service life\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment \u0026amp; Compatibility\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eFits 1989, 1990, and 1991 Cummins 12V 5.9L diesel engines\u003c\/li\u003e\n\u003cli\u003eCompatible with Dodge Ram 2500\/3500 trucks equipped with the 5.9L 12V Cummins\u003c\/li\u003e\n\u003cli\u003eReplaces OEM fuel injector line part numbers 3960783 (cylinder #1) and 3960784 (cylinder #2)\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eCommon Uses\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eReplacing cracked or leaking fuel injector lines on 12V Cummins engines\u003c\/li\u003e\n\u003cli\u003eRestoring fuel delivery after injector replacement or pump work\u003c\/li\u003e\n\u003cli\u003eRoutine maintenance of 1989–1991 Dodge Ram diesel trucks\u003c\/li\u003e\n\u003cli\u003eEngine rebuilds and performance restoration projects\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number(s):\u003c\/strong\u003e 3960783, 3960784\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEngine Application:\u003c\/strong\u003e 1989–1991 Cummins 12V 5.9L\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLine Material:\u003c\/strong\u003e Steel tubing\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eQuantity:\u003c\/strong\u003e 2 lines (cylinders #1 and #2)\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eQ:\u003c\/strong\u003e Do these injector lines come pre-formed for a 1990 Cummins 5.9L?\u003cstrong\u003e A:\u003c\/strong\u003e Yes, they are manufactured to the exact bends of the OEM lines for 1989–1991 12V 5.9L engines and install without bending.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eQ:\u003c\/strong\u003e Can I use these lines on a 1992 Cummins engine?\u003cstrong\u003e A:\u003c\/strong\u003e No, these are specifically designed for 1989–1991 engines; the 1992+ 12V engines use different line routing and part numbers.\u003c\/p\u003e\u003cp\u003e\u003cem\u003eProduct appearance and specifications may vary slightly by batch. Compatibility may vary by serial number. Verify fitment before purchase.\u003c\/em\u003e\u003c\/p\u003e","brand":"DURAFORCE","offers":[{"title":"Default Title","offer_id":53678085636369,"sku":"ZZ2Z01547","price":102.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0250\/2446\/2929\/files\/12_075c308e-515f-4113-bd21-9ba4b29cb19f.jpg?v=1781614522","url":"https:\/\/www.duraforce.com\/products\/fuel-injector-lines-fit-1989-91-cummins-engine-12v-5-9l-3960783-3960784","provider":"DURAFORCE","version":"1.0","type":"link"}