紫外线荧光染料对燃油系统染色和检漏

紫外线荧光染料对燃油系统染色和检漏

检测和查明燃油系统泄漏可能很困难并且很耗时。燃料是低粘度的流体，意味着它可以快速迁移并与其他流体混合。对于具有位于发动机内部且隐藏在机盖下的组件的燃油系统，尤其如此。这意味着发现这些泄漏并验证维修对防止重复维修和严重的发动机损坏非常重要。对于任何燃油喷射系统，安全性也是另一个考虑因素，对于高压共轨燃油系统而言，安全性甚至更高。即使通过许多类型的手套，在高压下喷洒的燃油也很容易渗透到人体皮肤，必须避免暴露于危险中。注入皮肤的燃料可能使血液中毒，导致肉体受损和感染，从而导致手指和四肢脱落，甚至导致死亡。

在燃料中添加紫外线示踪剂染料将有助于识别和查明燃料泄漏，并有助于提高安全性。旧时可能会想起曾经在燃油泵，管路和喷油器上运行一块纸板或纸的时间，这是定位泄漏的一种常用方法。使用染料和紫外线灯可使您的身体在检查期间保持安全距离。

从诊断上来说，示踪染料的使用远胜于任何其他视觉方法，因为即使存在少量泄漏，该染料也非常明显。以下两张照片显示了示踪剂染料的两个示例，这些示踪剂染料用于诊断具有高压共轨燃油系统的6.4升Power Stroke柴油发动机的燃油泄漏。在个示例中，在燃油入口配件处出现了较小的缓慢泄漏，否则可能很难发现。第二个例子是另一个喷油器在上半部螺母处泄漏，并且是一个相当大的泄漏，用肉眼可以很明显地看到，但是很难绝对确保它不仅是发动机油从相邻的阀部件上溅出。

要使用，请将一瓶紫外线示踪剂染料添加到燃油滤清器外壳中-多个滤清器系统上的辅助或引擎安装滤清器。通常，瓶子的装瓶量约为3盎司，您需要确保使用配制用于油溶性荧光检漏剂的染料。请勿使用水基荧光示踪剂染料（冷却剂）或空调制冷剂染料。然后启动系统并运转发动机约十五分钟，使染料与燃料混合并在系统内循环。关闭发动机，然后开始使用紫外线荧光检漏灯查找外部泄漏。对于发动机内部泄漏，请检查要检查的组件，然后使用紫外线荧光检漏灯检查。在某些带有电动燃油泵的发动机上，您可能会排放机油并放掉排放塞。使用具有双向控制功能的扫描工具打开燃油泵，然后等待燃油从曲轴箱滴落。染料的存在将仅确认燃油泄漏的事实……这证明需要检修阀盖或泵并继续检查。在某些情况下，可能有必要在检查泄漏的同时运行发动机。

上海路阳提供多种荧光检漏剂和荧光检漏灯，如欲进一步了解详细信息，请电话联系我们销售工程师，189-1703-9682

Fuel System UV Dye-agnosis

Detecting and pinpointing fuel system leaks can be difficult and time consuming. Fuel being a fluid of light viscosity means that it can migrate quickly and mix with other fluids. This is especially true for fuel systems with components that are located inside an engine and hidden under covers. This means that finding these leaks and verifying repairs is very important to prevent repeat repairs and severe engine damage. Safety is also another consideration with regard to any fuel injection system and even more so with high pressure common rail fuel systems. Fuel spray under high pressure will easily penetrate human skin, even through many types of gloves and risking exposure must be avoided. Fuel injected into the skin can poison blood, cause flesh damage and infections resulting in removal of fingers and limbs or even cause death.

Adding ultra-violet tracer dye to fuel will help identify and pinpoint fuel leaks and help promote safety. Old-timers might recall a time when running a piece of cardboard or paper along fuel pumps, lines and injectors was a common method of locating leaks. Using dye and an ultra-violet lamp keeps your body at a safe distance during inspections.

Diagnostically speaking the use of tracer dye is by far superior than any other visual method because the dye is extremely visible even when a small leak is present. The following two photographs show two examples of tracer dye being used to diagnose fuel leaks on 6.4L Power Stroke diesel engines that have a high pressure common rail fuel system. In the first example a smaller, slow leak at the fuel inlet fitting that otherwise might not have been easy to find. The second example another injector is leaking at the upper body nut and is a fairly large leak that was fairly obvious to see with the naked eye yet difficult to be absolutely sure that it also was not just engine oil splashing off of the adjacent valve components.

To use, add one bottle of UV Tracer Dye to the fuel filter housing - secondary or engine mounted filter on multiple filter systems. Typically the bottles contain about 3-ounces and you need to be sure to use dye formulated for use with oil based fluids. NOT water based dyes (coolant) or refrigerant dye (air conditioning). Then prime the system and run the engine for about fie minutes to get the dye mixed with the fuel and circulating within the system. Shut the engine down and begin searching for external leaks with a UV lamp. For internal engine leaks access the components to be inspected then inspect with a UV lamp. On some engines with electric fuel pumps you may drain the engine oil and leave the drain plug out. Turn the fuel pump on with a scan tool capable of bi-directional control and wait to see fuel dripping from the crankcase. The presence of dye will simply confirm the fact that fuel is leaking... validating the need to access valve covers or pumps and continue inspecting. In some instances it may be necessary to run the engine while inspecting for leaks.