Yukon wont start

Asked by Oneguytyoriginal Dec 02, 2018 at 09:18 PM about the 2002 GMC Yukon XL 2500 4WD

Question type: Maintenance & Repair

I can keep it running of starting fluid if i spray
continuously into intake....was running. Died and
wont start again.

2 Answers
42,950

Hornet_2497 answered 5 years ago

Running on starter fluid confirms you have spark. The problem has to be fuel. So listen for your fuel pump to hum/buzz when turning key to on, but do not crank engine while you listen. If no sound, check your pump fuse and pump relay. However, if the pump does run, then check the fuel filter and/or fuel pressure at the fuel rail at the engine/injectors. That should find the problem.

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42,950

Hornet_2497 answered 5 years ago

I should mention: your truck has three fuse boxes. Go to the one under the hood, located near the brake fluid reservoir. Your fuel pump fuse is labeled "IGN/C". Your fuel pump relay is labeled "F/PMP". Check/replace. If all the electrical tests okay, the pump must be bad.

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