engine not starting?

2003 ISUZU
120,000 MILES
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Isuzu 4HL1 diesel, what is the course of trouble? the engine is normally running in good condition then I park the truck, stitch off then after a few hours I start the engine and it will not, until now it is my problem. why?
Nov 16, 2012 at 12:02 PM
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KASEKENNY
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This could be a number of things but the most likely is a fuel issue. However, let's start with this guide that will walk us through getting started:

https://youtu.be/dCjmRL3p4Cs

Then we need to check the fuel pressure when this happens to confirm this.

Here is a guide that will help with this:

https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator

If the pressure is low we need to check the filter before you replace the pump. So I attached this below for your review.

Let us know what you find with this and we can go from there but if it turns out to be the pump, here is a guide that will help with replacing that as well:

https://www.2carpros.com/articles/how-to-replace-an-electric-fuel-pump

thanks
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Jan 18, 2021 at 3:57 PM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.