Fyred Up Posted June 6, 2012 Share Posted June 6, 2012 I'm new to Mack trucks and diesels in general so bear with me. A friend of mine bought an old fire engine earlier this year and I've been watching over the maintenance. Just a couple weeks ago it started leaking fuel really bad. We had to tilt the cab and run it to find the leak. Turns out it was the fuel filter. Whoever put it on must have used a filter wrench and ended up crushing the filter in two spots. It was spraying fuel from a crack in the filter housing right into the fan. The filter has since been replaced and I know I need to bleed the fuel system however I have never done this before and I don't know where the manual pump lever or the air bleed plug is. I think I might have to bleed the injector pump and possibly the injectors as well. I really don't want to mess anything up as it's not my truck. Any help is appreciated. Quote Link to comment https://www.bigmacktrucks.com/topic/25514-fuel-bleed-on-673c-newbie/ Share on other sites More sharing options...
BrianDzimitrowiczJr Posted June 6, 2012 Share Posted June 6, 2012 fill the filter full of fuel then spin it on. if it's an inline injector pump the plunger will be on the rear of the pump (towards the firewall). pump up the plunger until you feal resistance. start it up and let it idle. let it run for a few minutes. if there is any air in the system it'll work it's way out. Quote Brian1959 B61T Link to comment https://www.bigmacktrucks.com/topic/25514-fuel-bleed-on-673c-newbie/#findComment-122778 Share on other sites More sharing options...
theakerstwo Posted June 6, 2012 Share Posted June 6, 2012 The hand primer if its got one is on the side 2/3 way up and mounted on supply pump. It will never get hard to pump but will heard fuel returning to tank. You can crank it and it should start but if not crank maybe 3 injector lines on pump and crank till fuel flows out.Filters need to be full.. Quote glenn akers Link to comment https://www.bigmacktrucks.com/topic/25514-fuel-bleed-on-673c-newbie/#findComment-122784 Share on other sites More sharing options...
BrianDzimitrowiczJr Posted June 7, 2012 Share Posted June 7, 2012 when i changed my filters it did get hard to pump. and yes your right it is about 2/3 of the way back on the pump. Quote Brian1959 B61T Link to comment https://www.bigmacktrucks.com/topic/25514-fuel-bleed-on-673c-newbie/#findComment-122901 Share on other sites More sharing options...
Fyred Up Posted June 9, 2012 Author Share Posted June 9, 2012 Thank you for the advice. We got it running today. There was no manual pump handle so we just filled the filter up and then cranked it. It started on the fourth attempt. I was afraid we would kill both marine batteries but they held out. Now to see about the engine coolant and the shift linkage. Quote Link to comment https://www.bigmacktrucks.com/topic/25514-fuel-bleed-on-673c-newbie/#findComment-123165 Share on other sites More sharing options...
theakerstwo Posted June 9, 2012 Share Posted June 9, 2012 The hand primer if its got one is on the side 2/3 way up and mounted on supply pump. It will never get hard to pump but will heard fuel returning to tank. You can crank it and it should start but if not crank maybe 3 injector lines on pump and crank till fuel flows out.Filters need to be full.. Yes it will get hars to pump bvut i was thinging it will not get hard like a cat fuel primer. Sorry for the mis info. Quote glenn akers Link to comment https://www.bigmacktrucks.com/topic/25514-fuel-bleed-on-673c-newbie/#findComment-123170 Share on other sites More sharing options...
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