What Causes No Fuel Supply When Cold but Normal When Hot?

1 Answers
VanessaFitz
07/29/25 1:44pm
There may be several reasons for no fuel supply when the engine is cold but normal when hot: 1. The diesel fuel filter might be dirty. Note that there are three diesel fuel filters: one on the fuel line coming from the fuel tank (located near the tank), and two on the engine, specifically on the fuel inlet line. 2. Another possibility is that the high-pressure fuel pump is too dirty and must be inspected. Below are the relevant troubleshooting steps: 1. First, check the fuel system to see if the fuel lines are clogged. It's best to test whether the fuel pressure is within the standard range. 2. Next, observe the spray pattern of the fuel injectors to check for any dripping or leakage. 3. Also, inspect the throttle body for carbon buildup, as excessive dirt can cause poor acceleration. 4. Finally, test the ignition system for any electrical leakage.
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