{"product_id":"sierra-18-99530-marine-pressure-vacuum-tester-kit","title":"Sierra 18-99530 Pressure \u0026 Vacuum Tester (Replaces S34 \u0026 V34)","description":"\u003cp class=\"nvn-hero\"\u003eThe Sierra 18-99530 is a combined pressure and vacuum tester for diagnosing outboard fuel and cooling systems. It replaces the older S34 pressure tester and V34 vacuum tester in one kit, and ships with a hose assembly, a metric adapter, and a Suzuki adapter so you can connect to a wide range of engine fittings.\u003c\/p\u003e\n\n\u003cdiv class=\"nvn-description\"\u003e\n\u003cp\u003eThe Sierra 18-99530 is a combined pressure and vacuum tester built for diagnosing outboard fuel and cooling systems. It's the tool that replaces two older Sierra units, the S34 pressure tester and the V34 vacuum tester, and rolls both jobs into a single kit. Instead of reaching for one gauge to check pressure and another to pull a vacuum, you grab this one and cover both. For a working marine tech or a serious owner who does their own engine work, that's one less thing cluttering the bench and one less tool to keep calibrated.\u003c\/p\u003e\n\u003cp\u003ePressure and vacuum are two of the first readings you want when an outboard runs rough, stalls, or won't hold fuel. A pressure check tells you whether the fuel pump and vapor separator are delivering what the engine expects. A vacuum check tells you whether the fuel side is pulling air past a fitting, a primer bulb, or a cracked line before it ever reaches the pump. Both readings turn a guessing game into a real diagnosis. You stop throwing parts at the problem and start fixing the actual fault.\u003c\/p\u003e\n\u003cp\u003eThink about the common calls. An engine that starts fine cold but stumbles under load. A motor that loses its prime overnight and needs cranking to refill the fuel system. A repower that ran great on the test tank and then acts starved once it's on the boat. Each of those points back to fuel pressure or a vacuum leak, and each is faster to solve with real numbers in front of you. Hook up, run the engine or work the primer, and watch what the gauge does. The reading either confirms your hunch or sends you somewhere smarter.\u003c\/p\u003e\n\u003cp\u003eWhat makes this kit genuinely useful is what comes with it. You get the tester with its hose assembly, a metric adapter, and a Suzuki adapter. The hose assembly is the working connection between the gauge and the engine's test port, so it needs to seal clean every time. The metric adapter lets you thread into metric fittings, which is where a lot of import outboards land. And the Suzuki adapter is cut to fit Suzuki outboard fittings specifically, so you're not fighting a mismatched thread or improvising with tape. Between the three, you can hook onto a wide range of blocks without hunting for extra parts mid-job.\u003c\/p\u003e\n\u003cp\u003eThis isn't a throwaway consumer gauge. It's the kind of diagnostic tool a rigging shop keeps on the wall and reaches for on every fuel or vacuum complaint. If you run a service department, handle seasonal commissioning, or just refuse to send an engine problem out when you could read it yourself, it earns its spot fast. First-time owners can use it too, as long as you follow the engine's service procedure for where to tap in and what the target reading should be.\u003c\/p\u003e\n\u003cp\u003eA quick word on care, because a tester is only as honest as its weakest connection. The hose assembly lives a hard life around fuel and salt, and it's the part most likely to wear. Store the kit dry, keep it out of standing bilge water, and give the hose and fittings a look before each test. A cracked hose or a tired o-ring throws off a reading and sends you chasing a fault that isn't there. Snug the metric adapter carefully so the threads seal without cross-threading, and you'll get repeatable numbers season after season.\u003c\/p\u003e\n\u003cp\u003eBecause it's a Sierra part, it's built to meet or beat the original equipment it stands in for, backed the way you'd expect from a name that supplies OEM engine builders every day. If you've been running the older S34 and V34 separately, or you're setting up a bench from scratch, the 18-99530 gives you both tests, both adapters, and the hose in one box. Order it, keep it clean, and it'll tell you the truth about your fuel system every time you connect it.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul class=\"nvn-features\"\u003e\n  \u003cli\u003eCombined pressure and vacuum tester: one tool covers both fuel-pressure and vacuum-leak checks on outboards.\u003c\/li\u003e\n  \u003cli\u003eReplaces the Sierra S34 and V34 testers: consolidates two older single-function tools into one kit.\u003c\/li\u003e\n  \u003cli\u003eHose assembly included: sealed working connection between the gauge and the engine test port.\u003c\/li\u003e\n  \u003cli\u003eMetric adapter included: threads into the metric fittings common on import outboards.\u003c\/li\u003e\n  \u003cli\u003eSuzuki adapter included: cut to fit Suzuki outboard fittings without improvising with tape or a mismatched thread.\u003c\/li\u003e\n  \u003cli\u003eSierra Marine engineered to meet or exceed the OE part it replaces: built for the harsh marine environment.\u003c\/li\u003e\n  \u003cli\u003eComplete kit in one box: tester, hose assembly, and both adapters ready to connect.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cdiv class=\"nvn-trust\"\u003e\n  \u003ch2\u003eWhy Buy from NVN Marine\u003c\/h2\u003e\n  \u003cul\u003e\n    \u003cli\u003eAuthorized Sierra Marine reseller, full manufacturer warranty\u003c\/li\u003e\n    \u003cli\u003eNMEA member and ABYC certified, advice from real boat techs\u003c\/li\u003e\n    \u003cli\u003eSame-day shipping before 3 PM ET on in-stock items\u003c\/li\u003e\n    \u003cli\u003eNY headquarters and Fort Lauderdale flagship retail store\u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cdiv class=\"nvn-faq\"\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhat does the Sierra 18-99530 do?\u003c\/summary\u003e\n    \u003cp\u003eIt's a combined pressure and vacuum tester for outboard engines. You use it to read fuel-system pressure and to check for vacuum leaks, so you can diagnose a running or fuel problem instead of guessing at it.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhat comes in the kit?\u003c\/summary\u003e\n    \u003cp\u003eThe tester with its hose assembly, a metric adapter, and a Suzuki adapter. Those adapters let you connect to a range of engine fittings without hunting for extra parts.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eDoes this replace the S34 and V34 testers?\u003c\/summary\u003e\n    \u003cp\u003eYes. It stands in for both the older S34 pressure tester and the V34 vacuum tester, rolling both jobs into one kit.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhat's the metric adapter for?\u003c\/summary\u003e\n    \u003cp\u003eIt threads the tester into metric-sized fittings, which is where a lot of import outboards land. It saves you from improvising with tape or a mismatched fitting.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWill the Suzuki adapter fit my outboard?\u003c\/summary\u003e\n    \u003cp\u003eThe Suzuki adapter is cut for Suzuki outboard fittings. Check your engine's service information for the correct test port and thread before you connect, since fittings vary across model years.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eCan it test both pressure and vacuum?\u003c\/summary\u003e\n    \u003cp\u003eYes, that's the whole point of the combined design. You can read fuel-side pressure and pull a vacuum to find a leak with the same tool.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eHow do I keep the hose assembly in good shape?\u003c\/summary\u003e\n    \u003cp\u003eStore the kit dry and out of bilge water, and inspect the hose and fittings before each test. A cracked hose or worn o-ring throws off the reading, so replace anything that looks tired.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eIs this a genuine Sierra part?\u003c\/summary\u003e\n    \u003cp\u003eYes. We're an authorized Sierra Marine reseller, so it ships with the full manufacturer warranty and is built to meet or exceed the original equipment it replaces.\u003c\/p\u003e\n  \u003c\/details\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\u003ctable class=\"nvn-specs\"\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003cth\u003eTitle\u003c\/th\u003e\n\u003ctd\u003eSierra 18-99530 Pressure \u0026amp; Vacuum Tester\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eBrand\u003c\/th\u003e\n\u003ctd\u003eSierra Marine\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eManufacturer Part Number\u003c\/th\u003e\n\u003ctd\u003e18-99530\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eUPC\u003c\/th\u003e\n\u003ctd\u003e736983856302\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eProduct Type\u003c\/th\u003e\n\u003ctd\u003ePressure \u0026amp; Vacuum Tester\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eTester Function\u003c\/th\u003e\n\u003ctd\u003ePressure and vacuum testing\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eReplaces\u003c\/th\u003e\n\u003ctd\u003eS34 Pressure Tester\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eReplaces\u003c\/th\u003e\n\u003ctd\u003eV34 Vacuum Tester\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eHose Assembly\u003c\/th\u003e\n\u003ctd\u003eIncluded\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eMetric Adapter\u003c\/th\u003e\n\u003ctd\u003eIncluded\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eSuzuki Adapter\u003c\/th\u003e\n\u003ctd\u003eIncluded\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eApplication\u003c\/th\u003e\n\u003ctd\u003eMarine outboard engine diagnostics\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e\n{\n    \"@context\": \"https:\/\/schema.org\",\n    \"@type\": \"FAQPage\",\n    \"mainEntity\": [\n        {\n            \"@type\": \"Question\",\n            \"name\": \"What does the Sierra 18-99530 do?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"It's a combined pressure and vacuum tester for outboard engines. You use it to read fuel-system pressure and to check for vacuum leaks, so you can diagnose a running or fuel problem instead of guessing at it.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"What comes in the kit?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"The tester with its hose assembly, a metric adapter, and a Suzuki adapter. Those adapters let you connect to a range of engine fittings without hunting for extra parts.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"Does this replace the S34 and V34 testers?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"Yes. It stands in for both the older S34 pressure tester and the V34 vacuum tester, rolling both jobs into one kit.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"What's the metric adapter for?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"It threads the tester into metric-sized fittings, which is where a lot of import outboards land. It saves you from improvising with tape or a mismatched fitting.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"Will the Suzuki adapter fit my outboard?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"The Suzuki adapter is cut for Suzuki outboard fittings. Check your engine's service information for the correct test port and thread before you connect, since fittings vary across model years.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"Can it test both pressure and vacuum?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"Yes, that's the whole point of the combined design. You can read fuel-side pressure and pull a vacuum to find a leak with the same tool.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"How do I keep the hose assembly in good shape?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"Store the kit dry and out of bilge water, and inspect the hose and fittings before each test. A cracked hose or worn o-ring throws off the reading, so replace anything that looks tired.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"Is this a genuine Sierra part?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"Yes. We're an authorized Sierra Marine reseller, so it ships with the full manufacturer warranty and is built to meet or exceed the original equipment it replaces.\"\n            }\n        }\n    ]\n}\n\u003c\/script\u003e\n","brand":"Sierra Marine","offers":[{"title":"Default Title","offer_id":44999621050461,"sku":"2007808","price":263.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0299\/7266\/0317\/files\/ImageServerAPI_f30eb5bd-1768-4234-ba8e-3158305a1edf.jpg?v=1788720568","url":"https:\/\/nvnmarine.com\/products\/sierra-18-99530-marine-pressure-vacuum-tester-kit","provider":"NVN Marine","version":"1.0","type":"link"}