{"product_id":"3h6-04000-7-mechanical-fuel-pump-17fp001","title":"3H6-04000-7 Mechanical Fuel Pump Assembly","description":"\u003ch2\u003eMechanical Fuel Pump — Compatible with select Tohatsu Nissan Mercury Mariner Four-Stroke\u003c\/h2\u003e\n\u003ch3\u003eWhich pump is this?\u003c\/h3\u003e\n\u003cp\u003eThis is a complete mechanical diaphragm fuel-pump assembly for small carbureted four-stroke outboards. It replaces Tohatsu \/ Nissan 3H6-04000-7 (current), 3H6-04000-4, and 3H6-04000-3, and Mercury \/ Mariner 803529T06 (current) and 803529T03 (prior). Compatible with select Tohatsu \/ Nissan MFS4 \/ MFS5 \/ MFS6 and MFS8A3 \/ MFS9.8A3 four-stroke platforms, and with Mercury \/ Mariner 4, 5, and 6 HP carb four-stroke engines in the serial bands in the table. Pulse comes from the crankcase. It is not an electric \/ VST high-pressure pump, not a cooling water-pump impeller, and not a 2-stroke pump.\u003c\/p\u003e\n\u003ch3\u003eSigns yours is due\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eHard hot restart on a 4–6 HP four-stroke that used to fire immediately — the tiny diaphragm can take a set or weep into the pulse cavity.\u003c\/li\u003e\n\u003cli\u003eCarburetor bowl runs dry after a short sit, or idle dies when you tilt the motor — fuel is not being pulled from the tank.\u003c\/li\u003e\n\u003cli\u003eFuel smell or wetness at the pump body \/ pulse gasket, or a cracked plastic cover on this small assembly.\u003c\/li\u003e\n\u003cli\u003eNot a cooling problem: steam, overheat alarm, or no tell-tale is the water-pump impeller, not this fuel pump.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eWill it fit?\u003c\/h3\u003e\n\u003cp\u003eCompatible with the Tohatsu \/ Nissan four-stroke models and the Mercury \/ Mariner 4 \/ 5 \/ 6 HP carb serial ranges listed below. MFS4C \/ 5C \/ 6C books use 3H6-04000-4 on undated pages and 3H6-04000-7 on 2012–2014 dated books — same pump family, confirm the stamp on the pump you remove. Mercury 4–6 HP carb uses 803529T06 on current bands and 803529T03 on overlapping older catalog pages. Horsepower name alone does not prove fit. Same 4 \/ 5 \/ 6 HP badge shipped different pumps.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eEngine horsepower alone does not prove fit.\u003c\/strong\u003e Match the number stamped on the pump you remove to the OEM column.\u003c\/p\u003e\n\u003ctable border=\"1\" cellpadding=\"6\" cellspacing=\"0\"\u003e\n\u003ctr\u003e\n\u003cth\u003eBrand\u003c\/th\u003e\n\u003cth\u003eModel\u003c\/th\u003e\n\u003cth\u003eYears\u003c\/th\u003e\n\u003cth\u003eSerial\u003c\/th\u003e\n\u003cth\u003eHP\u003c\/th\u003e\n\u003cth\u003eOEM no.\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCompatible with Tohatsu \/ Nissan\u003c\/td\u003e\n\u003ctd\u003eMFS4B MFS5B MFS6B\u003c\/td\u003e\n\u003ctd\u003e2010\u003c\/td\u003e\n\u003ctd\u003e—\u003c\/td\u003e\n\u003ctd\u003e4\/5\/6 HP\u003c\/td\u003e\n\u003ctd\u003e3H6-04000-4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCompatible with Tohatsu \/ Nissan\u003c\/td\u003e\n\u003ctd\u003eMFS8A3 MFS9.8A3\u003c\/td\u003e\n\u003ctd\u003e2010–2011\u003c\/td\u003e\n\u003ctd\u003e—\u003c\/td\u003e\n\u003ctd\u003e8\/9.8 HP\u003c\/td\u003e\n\u003ctd\u003e3H6-04000-4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCompatible with Tohatsu \/ Nissan\u003c\/td\u003e\n\u003ctd\u003eMFS4C MFS5C MFS6C\u003c\/td\u003e\n\u003ctd\u003e—\u003c\/td\u003e\n\u003ctd\u003e—\u003c\/td\u003e\n\u003ctd\u003e4\/5\/6 HP\u003c\/td\u003e\n\u003ctd\u003e3H6-04000-4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCompatible with Tohatsu \/ Nissan\u003c\/td\u003e\n\u003ctd\u003eMFS4C MFS5C MFS6C\u003c\/td\u003e\n\u003ctd\u003e2012–2014\u003c\/td\u003e\n\u003ctd\u003e—\u003c\/td\u003e\n\u003ctd\u003e4\/5\/6 HP\u003c\/td\u003e\n\u003ctd\u003e3H6-04000-7\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCompatible with Tohatsu \/ Nissan\u003c\/td\u003e\n\u003ctd\u003eMFS8A3 MFS9.8A3\u003c\/td\u003e\n\u003ctd\u003e2012–2014\u003c\/td\u003e\n\u003ctd\u003e—\u003c\/td\u003e\n\u003ctd\u003e8\/9.8 HP\u003c\/td\u003e\n\u003ctd\u003e3H6-04000-7\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCompatible with Mercury \/ Mariner\u003c\/td\u003e\n\u003ctd\u003e4 HP Carb\u003c\/td\u003e\n\u003ctd\u003e—\u003c\/td\u003e\n\u003ctd\u003e0P401000 THRU 0R411837\u003c\/td\u003e\n\u003ctd\u003e4 HP\u003c\/td\u003e\n\u003ctd\u003e803529T06\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCompatible with Mercury \/ Mariner\u003c\/td\u003e\n\u003ctd\u003e4 HP Carb\u003c\/td\u003e\n\u003ctd\u003e—\u003c\/td\u003e\n\u003ctd\u003e0R067090 THRU 0R411837\u003c\/td\u003e\n\u003ctd\u003e4 HP\u003c\/td\u003e\n\u003ctd\u003e803529T06\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCompatible with Mercury \/ Mariner\u003c\/td\u003e\n\u003ctd\u003e4 HP Carb\u003c\/td\u003e\n\u003ctd\u003e—\u003c\/td\u003e\n\u003ctd\u003e0R411838 \u0026amp; Up\u003c\/td\u003e\n\u003ctd\u003e4 HP\u003c\/td\u003e\n\u003ctd\u003e803529T06\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCompatible with Mercury \/ Mariner\u003c\/td\u003e\n\u003ctd\u003e5 HP Carb\u003c\/td\u003e\n\u003ctd\u003e—\u003c\/td\u003e\n\u003ctd\u003e0P401000 THRU 0R411837\u003c\/td\u003e\n\u003ctd\u003e5 HP\u003c\/td\u003e\n\u003ctd\u003e803529T06\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCompatible with Mercury \/ Mariner\u003c\/td\u003e\n\u003ctd\u003e5 HP Carb\u003c\/td\u003e\n\u003ctd\u003e—\u003c\/td\u003e\n\u003ctd\u003e0R067090 THRU 0R411837\u003c\/td\u003e\n\u003ctd\u003e5 HP\u003c\/td\u003e\n\u003ctd\u003e803529T06\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCompatible with Mercury \/ Mariner\u003c\/td\u003e\n\u003ctd\u003e5 HP Carb\u003c\/td\u003e\n\u003ctd\u003e—\u003c\/td\u003e\n\u003ctd\u003e0R411838 \u0026amp; Up\u003c\/td\u003e\n\u003ctd\u003e5 HP\u003c\/td\u003e\n\u003ctd\u003e803529T06\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCompatible with Mercury \/ Mariner\u003c\/td\u003e\n\u003ctd\u003e5 HP Carb JCI\u003c\/td\u003e\n\u003ctd\u003e—\u003c\/td\u003e\n\u003ctd\u003e0R560794 \u0026amp; Up\u003c\/td\u003e\n\u003ctd\u003e5 HP\u003c\/td\u003e\n\u003ctd\u003e803529T06\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCompatible with Mercury \/ Mariner\u003c\/td\u003e\n\u003ctd\u003e6 HP Carb\u003c\/td\u003e\n\u003ctd\u003e—\u003c\/td\u003e\n\u003ctd\u003e0P401000 THRU 0R411837\u003c\/td\u003e\n\u003ctd\u003e6 HP\u003c\/td\u003e\n\u003ctd\u003e803529T06\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCompatible with Mercury \/ Mariner\u003c\/td\u003e\n\u003ctd\u003e6 HP Carb\u003c\/td\u003e\n\u003ctd\u003e—\u003c\/td\u003e\n\u003ctd\u003e0R067090 THRU 0R411837\u003c\/td\u003e\n\u003ctd\u003e6 HP\u003c\/td\u003e\n\u003ctd\u003e803529T06\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCompatible with Mercury \/ Mariner\u003c\/td\u003e\n\u003ctd\u003e6 HP Carb\u003c\/td\u003e\n\u003ctd\u003e—\u003c\/td\u003e\n\u003ctd\u003e0R411838 \u0026amp; Up\u003c\/td\u003e\n\u003ctd\u003e6 HP\u003c\/td\u003e\n\u003ctd\u003e803529T06\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCompatible with Mercury \/ Mariner\u003c\/td\u003e\n\u003ctd\u003e4 HP Carb\u003c\/td\u003e\n\u003ctd\u003e—\u003c\/td\u003e\n\u003ctd\u003e0P401000 THRU 0R411837\u003c\/td\u003e\n\u003ctd\u003e4 HP\u003c\/td\u003e\n\u003ctd\u003e803529T03\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCompatible with Mercury \/ Mariner\u003c\/td\u003e\n\u003ctd\u003e4 HP Carb\u003c\/td\u003e\n\u003ctd\u003e—\u003c\/td\u003e\n\u003ctd\u003e0R067090 THRU 0R411837\u003c\/td\u003e\n\u003ctd\u003e4 HP\u003c\/td\u003e\n\u003ctd\u003e803529T03\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCompatible with Mercury \/ Mariner\u003c\/td\u003e\n\u003ctd\u003e5 HP Carb\u003c\/td\u003e\n\u003ctd\u003e—\u003c\/td\u003e\n\u003ctd\u003e0P401000 THRU 0R411837\u003c\/td\u003e\n\u003ctd\u003e5 HP\u003c\/td\u003e\n\u003ctd\u003e803529T03\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCompatible with Mercury \/ Mariner\u003c\/td\u003e\n\u003ctd\u003e5 HP Carb\u003c\/td\u003e\n\u003ctd\u003e—\u003c\/td\u003e\n\u003ctd\u003e0R067090 THRU 0R411837\u003c\/td\u003e\n\u003ctd\u003e5 HP\u003c\/td\u003e\n\u003ctd\u003e803529T03\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCompatible with Mercury \/ Mariner\u003c\/td\u003e\n\u003ctd\u003e6 HP Carb\u003c\/td\u003e\n\u003ctd\u003e—\u003c\/td\u003e\n\u003ctd\u003e0P401000 THRU 0R411837\u003c\/td\u003e\n\u003ctd\u003e6 HP\u003c\/td\u003e\n\u003ctd\u003e803529T03\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCompatible with Mercury \/ Mariner\u003c\/td\u003e\n\u003ctd\u003e6 HP Carb\u003c\/td\u003e\n\u003ctd\u003e—\u003c\/td\u003e\n\u003ctd\u003e0R067090 THRU 0R411837\u003c\/td\u003e\n\u003ctd\u003e6 HP\u003c\/td\u003e\n\u003ctd\u003e803529T03\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003cp\u003eEvery row is from this SKU fitment workbook (21 rows after empty-line filter). Same horsepower name shipped different pumps.\u003c\/p\u003e\n\u003ch3\u003eOEM and swap numbers\u003c\/h3\u003e\n\u003cp\u003eOEM \/ predecessor numbers keep the engine-brand column. Aftermarket cross-refs are numbers only.\u003c\/p\u003e\n\u003ctable border=\"1\" cellpadding=\"6\" cellspacing=\"0\"\u003e\n\u003ctr\u003e\n\u003cth\u003eClass\u003c\/th\u003e\n\u003cth\u003ePart no.\u003c\/th\u003e\n\u003cth\u003eBrand\u003c\/th\u003e\n\u003cth\u003eName\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOEM\u003c\/td\u003e\n\u003ctd\u003e3H6-04000-4\u003c\/td\u003e\n\u003ctd\u003eCompatible with Tohatsu \/ Nissan\u003c\/td\u003e\n\u003ctd\u003eFuel Pump Assembly\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOEM\u003c\/td\u003e\n\u003ctd\u003e3H6-04000-7\u003c\/td\u003e\n\u003ctd\u003eCompatible with Tohatsu \/ Nissan\u003c\/td\u003e\n\u003ctd\u003eFuel Pump Assembly\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOEM\u003c\/td\u003e\n\u003ctd\u003e3H6-04000-3\u003c\/td\u003e\n\u003ctd\u003eCompatible with Tohatsu \/ Nissan\u003c\/td\u003e\n\u003ctd\u003eFuel Pump Assembly\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOEM\u003c\/td\u003e\n\u003ctd\u003e803529T06\u003c\/td\u003e\n\u003ctd\u003eCompatible with Mercury \/ Mariner\u003c\/td\u003e\n\u003ctd\u003ePUMP Fuel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003epredecessor\u003c\/td\u003e\n\u003ctd\u003e803529T03\u003c\/td\u003e\n\u003ctd\u003eCompatible with Mercury \/ Mariner\u003c\/td\u003e\n\u003ctd\u003ePUMP ASSEMBLY Fuel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ecross-ref\u003c\/td\u003e\n\u003ctd\u003e9-35500\u003c\/td\u003e\n\u003ctd\u003e—\u003c\/td\u003e\n\u003ctd\u003e3H6-04000-3\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ecross-ref\u003c\/td\u003e\n\u003ctd\u003e1399-39545\u003c\/td\u003e\n\u003ctd\u003e—\u003c\/td\u003e\n\u003ctd\u003e3H6-04000-7; 803529T06\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003ch3\u003eWrong part\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eNOT 803529T07 — that is the 8 \/ 9.9 HP 209cc Mercury \/ Mariner family, a different pump.\u003c\/li\u003e\n\u003cli\u003eNOT 3H8-04000-1 \/ 803529T04 — larger four-stroke family (neighbor SKU 24FP095), not this small carb pump.\u003c\/li\u003e\n\u003cli\u003eNOT a 2-stroke fuel pump (356-04000-1 \/ 6E5-24410 and similar) and NOT a water-pump impeller.\u003c\/li\u003e\n\u003cli\u003eNOT kit 26FFK028 — that SKU adds a filter. This page is the pump assembly only.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eWhat ships\u003c\/h3\u003e\n\u003cp\u003eOne complete mechanical fuel-pump assembly. No hose, no fuel filter, no carburetor, no rebuild kit, no bolts unless they are staked on the pump you see in the photos.\u003c\/p\u003e\n\u003ch3\u003eOften replaced together\u003c\/h3\u003e\n\u003cp\u003eWhile the cowl is off, inspect the fuel-filter element and the primer bulb. Those are sold separately. If you need the pump plus filter as a set, that is a different GHMarine SKU (26FFK family), not this page.\u003c\/p\u003e\n\u003ch3\u003eInstall\u003c\/h3\u003e\n\u003cp\u003eShut the tank, relieve pressure, and catch fuel. Photograph the pulse hose and fuel-line routing before you pull the old pump. Remove the two (typical) flange screws, lift the pump, and scrape the old gasket off the crankcase pad. Fit a new gasket dry unless your shop manual calls for a thin sealant. Seat the pulse port on the crankcase passage — a pinched gasket here mimics a dead pump. Snug the screws evenly; do not crush the cover. Prime the bulb, check for leaks, then run on muffs. If it still will not pick up fuel, check the tank vent and the bulb before you blame the new pump.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWill this fit my 8 \/ 9.8 HP Tohatsu four-stroke?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eMFS8A3 \/ MFS9.8A3 four-stroke rows are in the table with 3H6-04000-4 or 3H6-04000-7. Compatible with those catalog platforms only — not Mercury 8 \/ 9.9 HP 803529T07. Match the stamp on the pump you remove.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill this fit my Mercury 4 \/ 5 \/ 6 HP four-stroke?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eCompatible with carb 4 \/ 5 \/ 6 HP four-stroke engines in the serial bands in the table (803529T06 current, 803529T03 prior). Horsepower on the cowl is not enough. Read the serial on the midsection or swivel bracket.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs this an electric pump?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eNo. Mechanical diaphragm, crankcase pulse. If your engine uses a VST \/ electric high-pressure pump, this is the wrong part.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is in the box?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eOne complete mechanical fuel-pump assembly. No extra hose, filter, or carburetor kit.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow do I know the old pump is bad?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eHard hot restart, dry carb bowl, fuel weep at the body, or a cracked cover. Overheat \/ no tell-tale is the water pump, not this part.\u003c\/p\u003e\n\u003ch3\u003ePlease note\u003c\/h3\u003e\n\u003cp\u003eAftermarket fuel pump by GHMarine. Not affiliated with the engine brands named above. «Compatible with», «Replaces», and cross-ref numbers mean this part is built to work like the originals listed — always confirm the stamp on the removed pump, the engine model, and the serial range before you order. This page is the pump only, not a multi-part kit.\u003c\/p\u003e","brand":"GHMarine","offers":[{"title":"Default Title","offer_id":51797481652470,"sku":"17FP001","price":34.49,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0741\/5781\/8102\/files\/ghm_17FP001_04.jpg?v=1791336534","url":"https:\/\/gh-marine.com\/products\/3h6-04000-7-mechanical-fuel-pump-17fp001","provider":"GH Marine","version":"1.0","type":"link"}