{"id":41513,"date":"2021-07-13T01:11:10","date_gmt":"2021-07-13T08:11:10","guid":{"rendered":"https:\/\/blogv2prod.wpenginepowered.com\/blog\/?p=41513"},"modified":"2023-07-28T03:35:45","modified_gmt":"2023-07-28T10:35:45","slug":"vapor-lock-symptoms-causes-and-solutions","status":"publish","type":"post","link":"https:\/\/www.carparts.com\/blog\/vapor-lock-symptoms-causes-and-solutions\/","title":{"rendered":"Vapor Lock: Symptoms, Causes, and Solutions"},"content":{"rendered":"<!DOCTYPE html PUBLIC \"-\/\/W3C\/\/DTD HTML 4.0 Transitional\/\/EN\" \"http:\/\/www.w3.org\/TR\/REC-html40\/loose.dtd\">\n<html><body><span class=\"span-reading-time rt-reading-time\" style=\"display: block;\"><span class=\"rt-label rt-prefix\">Reading Time: <\/span> <span class=\"rt-time\"> 4<\/span> <span class=\"rt-label rt-postfix\">minutes<\/span><\/span><style>.kadence-column_3e79a5-d5 > .kt-inside-inner-col{border-top-width:0px;border-right-width:0px;border-bottom-width:0px;border-left-width:0px;}.kadence-column_3e79a5-d5 > .kt-inside-inner-col,.kadence-column_3e79a5-d5 > .kt-inside-inner-col:before{border-top-left-radius:0px;border-top-right-radius:0px;border-bottom-right-radius:0px;border-bottom-left-radius:0px;}.kadence-column_3e79a5-d5 > .kt-inside-inner-col{column-gap:var(--global-kb-gap-sm, 1rem);}.kadence-column_3e79a5-d5 > .kt-inside-inner-col{flex-direction:column;}.kadence-column_3e79a5-d5 > .kt-inside-inner-col > .aligncenter{width:100%;}.kadence-column_3e79a5-d5 > .kt-inside-inner-col:before{opacity:0.3;}.kadence-column_3e79a5-d5{position:relative;}@media all and (max-width: 1024px){.kadence-column_3e79a5-d5 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}@media all and (max-width: 767px){.kadence-column_3e79a5-d5 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}<\/style>\n<div class=\"wp-block-kadence-column inner-column-1 kadence-column_3e79a5-d5 qk-look-widget\"><div class=\"kt-inside-inner-col\">\n<div class=\"wp-block-ultimate-post-row ultp-block-d28f2a  qk-main-wrap\"><div class=\"ultp-row-wrapper\"><div class=\"ultp-row-content\">\n<div class=\"wp-block-ultimate-post-column ultp-block-cc99e2\"><div class=\"ultp-column-wrapper\"><style>.wp-block-kadence-advancedheading.kt-adv-heading_2d34ae-e4, .wp-block-kadence-advancedheading.kt-adv-heading_2d34ae-e4[data-kb-block=\"kb-adv-heading_2d34ae-e4\"]{text-align:center;font-size:20px;font-style:normal;}.wp-block-kadence-advancedheading.kt-adv-heading_2d34ae-e4 mark.kt-highlight, .wp-block-kadence-advancedheading.kt-adv-heading_2d34ae-e4[data-kb-block=\"kb-adv-heading_2d34ae-e4\"] mark.kt-highlight{font-family:Inter;font-weight:500;font-style:normal;color:#f76a0c;-webkit-box-decoration-break:clone;box-decoration-break:clone;padding-top:0px;padding-right:0px;padding-bottom:0px;padding-left:0px;}.wp-block-kadence-advancedheading.kt-adv-heading_2d34ae-e4 img.kb-inline-image, .wp-block-kadence-advancedheading.kt-adv-heading_2d34ae-e4[data-kb-block=\"kb-adv-heading_2d34ae-e4\"] img.kb-inline-image{width:150px;vertical-align:baseline;}<\/style>\n<div class=\"kt-adv-heading_2d34ae-e4 summary-title wp-block-kadence-advancedheading\" data-kb-block=\"kb-adv-heading_2d34ae-e4\"><span>Summary<\/span><\/div>\n\n\n\n<ul class=\"wp-block-list\"><li>Vapor lock is a problem more often found in older vehicles. It happens when vaporized fuel prevents the fuel system from delivering the proper amount of gasoline to the engine.<\/li><li>Common causes of vapor lock include high outside ambient temperatures, extreme engine operating temperatures, fuel lines routed too close to hot vehicle components, using a winter fuel blend in warm weather, and driving at a high altitudes.<\/li><li>Vapor lock will often result in stalling, hard starting, misfiring, rough running, and the engine accelerating poorly or hesitating.<\/li><li>To solve vapor lock issues, you might need to address other problems in the vehicle such as overheating or misrouted fuel lines.<\/li><\/ul>\n<\/div><\/div>\n<\/div><\/div><\/div>\n<\/div><\/div>\n\n\n\n\n\n<p>Automotive technology has improved a great deal over the years. In the past, vintage vehicles equipped with <a href=\"https:\/\/www.carparts.com\/carburetor\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"carburetors\">carburetors<\/a> often suffered from vapor lock&mdash;a phenomenon that&rsquo;s rarely a concern with today&rsquo;s fuel-injected engines.<\/p>\n\n\n\n<p>Vapor lock can cause a variety of problems that make a vehicle difficult to start and drive. If you&rsquo;ve got a classic car, it&rsquo;s helpful to understand vapor lock and the associated symptoms<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">What is Vapor Lock?<\/h2>\n\n\n\n<p>Vapor lock is a phenomenon that occurs when liquid fuel becomes hot enough to vaporize. The vaporized fuel creates a lean condition (not enough liquid fuel) that prevents the <a href=\"https:\/\/www.carparts.com\/blog\/fuel-system\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"fuel system\">fuel system<\/a> from delivering the proper amount of gasoline to the engine.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/07\/automotive-carburetor-1024x679.jpg\" alt=\"automotive carburetor\" class=\"wp-image-41515\" width=\"1024\" height=\"679\" srcset=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/07\/automotive-carburetor-1024x679.jpg 1024w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/07\/automotive-carburetor-300x199.jpg 300w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/07\/automotive-carburetor-768x509.jpg 768w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/07\/automotive-carburetor-150x99.jpg 150w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/07\/automotive-carburetor.jpg 1500w\" sizes=\"(max-width: 1024px) 100vw, 1024px\"><figcaption>Problems with vapor lock are most common on older vehicles that have a carburetor and a mechanical, engine-driven fuel pump.<\/figcaption><\/figure>\n\n\n\n<p>Problems with vapor lock are most common on older vehicles that have a carburetor and a mechanical, engine-driven <a href=\"https:\/\/www.carparts.com\/fuel-pump\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"fuel pump\">fuel pump<\/a>. This type of setup, which operates at relatively low pressure and locates the fuel pump a long way from the gas tank, increases the likelihood of a vapor lock between the tank and pump.<\/p>\n\n\n\n<p>What&rsquo;s more, vapor lock can have a significant impact on a carbureted fuel system, as the issue can lead to the float chamber inside the carburetor being depleted of gasoline. The engine is starved of fuel as a result.<\/p>\n\n\n\n<p>Meanwhile, modern fuel-injected engines have the fuel pump located in the gas tank. The location keeps the pump running cool and the entire fuel system under higher pressure, thereby reducing the risk of vapor lock.<\/p>\n\n\n\n<div id=\"article-search-widget\">\n<div class=\"cp-search\">\n<div align=\"center\">\n<img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/cld.partsimg.com\/image\/upload\/w_auto,dpr_auto\/carparts\/logos\/badge_wordmark\/full_color\/CP_LOGO_COLOUR_RGB\" alt=\"CarParts.com\" width=\"300\" height=\"56\">\n<\/div>\n<form id=\"cpsearchform\" name=\"cpsearchform\" action=\"https:\/\/www.carparts.com\/search\" method=\"get\" target=\"_blank\" accept-charset=\"character_set\" aria-label=\"search CarParts.com\">\n    <input type=\"text\" class=\"keyword\" name=\"q\" placeholder=\"Search for parts on CarParts.com\" value=\"\" aria-label=\"Search CarParts.com\"><input type=\"submit\" class=\"btn-search\" value=\"Search\" aria-label=\"Search\">\n<\/form>\n<\/div>\n<\/div>\n\n\n\n<h2 class=\"wp-block-heading\">Common causes of vapor lock include:<\/h2>\n\n\n\n<ul class=\"wp-block-list\"><li>High outside ambient temperatures<\/li><li>Extreme engine operating temperatures<\/li><li>Fuel lines routed too close to the exhaust system and other hot components<\/li><li>Running a winter fuel blend during warm weather<\/li><li>Driving at a high altitude<\/li><\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">What are the Symptoms of Vapor Lock?<\/h2>\n\n\n\n<p>Vapor lock prevents the engine from getting the correct amount of liquid fuel. The problem can lead to a variety of noticeable symptoms, such as:<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Stalling and Hard Starting<\/h3>\n\n\n\n<p>A gasoline engine needs three primary ingredients to run: a <a href=\"https:\/\/www.carparts.com\/blog\/what-is-a-good-air-fuel-ratio-chart-included\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"precise air-fuel mixture\">precise air-fuel mixture<\/a>, good compression, and proper spark. Vapor lock can disrupt the delivery of liquid fuel to the engine, causing the vehicle to stall. The engine may also be difficult to restart once it&rsquo;s warmed up.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Misfiring and Rough Running<\/h3>\n\n\n\n<p>Similarly, vapor lock can cause fuel delivery problems that lead to incomplete combustion inside of the engine. As a result, you may notice that the vehicle misfires and runs rough.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Poor Acceleration and Hesitation<\/h3>\n\n\n\n<p>An engine that is starved of liquid fuel (due to vapor lock) may exhibit <a href=\"https:\/\/www.carparts.com\/blog\/my-car-wont-accelerate-properly-when-i-push-the-gas-causes\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"poor acceleration\">poor acceleration<\/a> and hesitation.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">How Do You Fix a Vapor Lock?<\/h2>\n\n\n\n<p>Exactly how you address a vapor lock problem will depend on what caused the condition in the first place. For example, if the vapor lock is occurring due to engine overheating or misrouted fuel lines, you&rsquo;ll need to make some repairs to fix the problem permanently.<\/p>\n\n\n\n<p>You can, however, take some steps to relieve the fuel system from vapor lock temporarily. First, you must let the fuel cool so that it returns to a liquid state. You can get the fuel system to cool more quickly by taking steps, such as parking in the shade and opening the hood.<\/p>\n\n\n\n<p>Once the fuel system has cooled, you can help eliminate any vapor left in the fuel system by first pressing the accelerator pedal slightly (do not press it to the floor) while cranking the engine. Once the engine starts, hold the accelerator pedal down until the vehicle runs smoothly, indicating the vapor lock is gone.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/07\/repairing-car-with-carburetor-1024x683.jpg\" alt=\"repairing car with carburetor\" class=\"wp-image-41517\" width=\"1024\" height=\"683\" srcset=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/07\/repairing-car-with-carburetor-1024x683.jpg 1024w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/07\/repairing-car-with-carburetor-300x200.jpg 300w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/07\/repairing-car-with-carburetor-768x512.jpg 768w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/07\/repairing-car-with-carburetor-600x400.jpg 600w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/07\/repairing-car-with-carburetor-150x100.jpg 150w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/07\/repairing-car-with-carburetor.jpg 1500w\" sizes=\"(max-width: 1024px) 100vw, 1024px\"><figcaption>Make sure the fuel lines are routed away from the exhaust system and other hot components to prevent vapor lock.<\/figcaption><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">Vapor Lock Solutions<\/h2>\n\n\n\n<p>If you have an older, carbureted vehicle, there are some steps you can take to prevent vapor lock. For one, you&rsquo;ll want to make sure the fuel lines are routed away from the exhaust system and other hot components. You might also consider covering the fuel lines and the carburetor in heat shields. Another option is to retrofit the vehicle with an in-tank <a href=\"https:\/\/www.carparts.com\/fuel-pump\/electric\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"electric fuel pump\">electric fuel pump<\/a>.<\/p>\n<\/body><\/html>\n","protected":false},"excerpt":{"rendered":"<p><span class=\"span-reading-time rt-reading-time\" style=\"display: block;\"><span class=\"rt-label rt-prefix\">Reading Time: <\/span> <span class=\"rt-time\"> 4<\/span> <span class=\"rt-label rt-postfix\">minutes<\/span><\/span>Automotive technology has improved a great deal over the years. In the past, vintage vehicles equipped with carburetors often suffered&#8230; <a href=\"https:\/\/www.carparts.com\/blog\/vapor-lock-symptoms-causes-and-solutions\/\" rel=\"nofollow\">Read More<\/a><\/p>\n","protected":false},"author":29,"featured_media":41518,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_genesis_hide_title":false,"_genesis_hide_breadcrumbs":false,"_genesis_hide_singular_image":false,"_genesis_hide_footer_widgets":false,"_genesis_custom_body_class":"","_genesis_custom_post_class":"","_genesis_layout":"","footnotes":""},"categories":[52,3747],"tags":[],"ppma_author":[2622],"class_list":{"0":"post-41513","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-diy","8":"category-engine","9":"entry"},"acf":{"adrotate_specific_mobile_ad":"","adrotate_specific_desktop_ad":""},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Vapor Lock: Symptoms, Causes, and Solutions - In The Garage with CarParts.com<\/title>\n<meta name=\"description\" content=\"Vapor lock often happens to old vehicles with carburetors. 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