QSC8.3 FUEL ISSUES

[Douglas Craigie]

My QSC8.3 wont go past 1500rpm and gives me low fuel pressure alarm and starts belching alot of black smoke out wet exhaust. I’ve switched from racor to double double filters, all main fuel lines are clear, replaced injectors pressure sensor relief valve actuator and priming pump. Only other option I feel is fuel pump. Has anyone experienced anything like this?

Topic

[Tony Athens]

1) Past history of running well ??

2) Alarm codes?

3) A failed BOOST sensor will cause that exact symptom.

Tony

[Philip]

Interesting that you get low fuel pressure AND black smoke. As we know black smoke is unburied fuel. With low fuel pressure I’d expect the absence of fuel and no black smoke.

AIR issues: Not getting enough air can be caused by a dirty/collapsed air cleaner, a leaking turbo hose, a filthy aftercooler or air restriction inside the aftercooler, a worn out or partially stuck turbo, or a poorly ventilated engine room. Any combo of these can restrict air to the engine causing dark smoke and further, low power.

Got any pictures of the engine and especially turbo/exhaust area? I’m wondering if you really have a turbo issue. If your turbo is sticking for whatever reason you will have an air restriction and excess fuel = black smoke.

Post some pictures, let’s see if we can help you out…

Phil

[Author]

Replies