Auto Service Professional

OCT 2017

Magazine for the auto service professional

Issue link: https://asp.epubxp.com/i/885903

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43 | ASP October 2017 Circle 115 on Reader Service Card Includes: TP-8695 cordless, high-intensity UV LED flashlight and 1 oz (30 ml) bottles of each of these dyes: TP-8692 UV MULTI-COLORED FLUID DYE KIT For Petroleum- or Synthetic-Based Fluid Systems: TP-3320 TP-3340 TP-3380 WHITE BLUE YELLOW For Conventional Coolants and/ or Truck/Trailer Body Leaks: TP-3900 GREEN PINPOINT THE EXACT SOURCE OF MULTIPLE LEAKS IN ALL FLUID SYSTEMS COLOR-CODED DYES TO L E A R N M O R E , S C A N Q R C O D E O R V I S I T : W W W. T R AC E R L I N E . C O M Technical pump increases fuel pressure for delivery to the fuel injectors. A fuel cooler system cools fuel that returns from the injectors and the high pressure pump. In the low pressure system, fuel is pumped from the fuel tank to the primary fuel filter by the electric pump at about 5 psi to 10 psi during engine idle. Fuel is pumped to the secondary fuel filter which is located on the left front of the engine. e filtered fuel flows to the high pressure pump. A pressure regula- tor located in the secondary filter sends some of the fuel back to the tank. As noted, after the secondary filter, fuel is sent to the high pressure fuel injection pump. e high pressure pump is gear-driven by a gear on the camshaft and is located at the rear of the engine, in the engine's upper valley, requiring removal of the turbos and intake manifold. It's important to note that while the inlet pressure to the high pressure pump may be as little as 3 psi to 6 psi, the high pressure pump is capable of increasing fuel pressure to in excess of 24,000 psi. Normal operating high pressure to drive the injectors is about 5,500 psi, with pressure increasing depending on load.

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