CDJ Posted September 22, 2023 Share Posted September 22, 2023 Does anyone know where to get push to lock assortment used on fuel line connections at ECM and at fuel filter base on 2018 MP7. I would like to make up my own test hoses'. I would like to check fuel pressure and see if there is air in the return line back to tank. Quote Link to comment https://www.bigmacktrucks.com/topic/73338-low-pressure-fuel-system-drops-how-to-check-fuel-pressure/ Share on other sites More sharing options...
steeler Posted September 28, 2023 Share Posted September 28, 2023 Id like to know as well. Ticks me off that mack doesn't use the low pressure sensor on the newer engines, just the aftertreatment fuel pressure. Actually the sensor is there on some, but nothing on the engine harness. Quote Link to comment https://www.bigmacktrucks.com/topic/73338-low-pressure-fuel-system-drops-how-to-check-fuel-pressure/#findComment-539376 Share on other sites More sharing options...
Joey Mack Posted September 28, 2023 Share Posted September 28, 2023 I wonder if there is a port that you can connect too and install a mechanical gauge.. it's been a while since I had one of these in my shop... Quote Link to comment https://www.bigmacktrucks.com/topic/73338-low-pressure-fuel-system-drops-how-to-check-fuel-pressure/#findComment-539384 Share on other sites More sharing options...
Mackpro Posted September 29, 2023 Share Posted September 29, 2023 Amazon has a large variety of the fittings though I’m not 100% sure of the size needed. I save any fitting I can get my hands on when I replace a line on the common rail engines. There is a high failure rate on the return line from the from of the cylinder head to the filter stand on the MP8/D13, there is a new updated line and fitting available now. Sometime in 2022 they started putting the fuel pressure sensor back on the filter stand again. I’ll see if I can find the bulletin on adding it to a early common rail. Quote Link to comment https://www.bigmacktrucks.com/topic/73338-low-pressure-fuel-system-drops-how-to-check-fuel-pressure/#findComment-539429 Share on other sites More sharing options...
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