h67st Posted February 28, 2011 Share Posted February 28, 2011 Howdy! I just started working on my H67; hasn't been run for years so lots of work to do. I steamed out the fuel tank, put in fresh fuel, replaced all the fuel lines, and replaced the fuel filter can with a spin-on head. I've had it running several times and it doesn't matter if it sits overnight or for 5 minutes, when I start it it starves for fuel and I have to rev it to keep it from stalling. Once it gets past that point, it will stay running. I checked the standpipe and all the fittings; I don't see where it would be sucking air. What about the hand primer base or check valves...can someone tell me if they've had a problem there? This photo is from the previous owner, it looks pretty much like that now. Thank you for any help you can give! Quote Link to comment https://www.bigmacktrucks.com/topic/18169-fuel-starving-673/ Share on other sites More sharing options...
fifth wheel Posted March 1, 2011 Share Posted March 1, 2011 The check valves in the transfer pump.FW Quote Link to comment https://www.bigmacktrucks.com/topic/18169-fuel-starving-673/#findComment-73760 Share on other sites More sharing options...
steve s. Posted March 1, 2011 Share Posted March 1, 2011 I have a 673 that leaked air just about everywhere it could when I first got it, including the hand primer pump. It took a while to find and repair all the leaks. Stick with it , you'll find them. Steve Quote Link to comment https://www.bigmacktrucks.com/topic/18169-fuel-starving-673/#findComment-73764 Share on other sites More sharing options...
MACKS Posted March 1, 2011 Share Posted March 1, 2011 If you think it's an air leak pressurise the fuel tank and then look for fuel leaks,you can use a short piece of bike tube,tie off one end and clamp the other end over the fuel fill. Quote Link to comment https://www.bigmacktrucks.com/topic/18169-fuel-starving-673/#findComment-73769 Share on other sites More sharing options...
theakerstwo Posted March 1, 2011 Share Posted March 1, 2011 Check yor fuel mpressure then you can start on a ideal. Needs around maybe 25 or better.and if that it bthen the supply pump valves or the over flow valve or sometimes called regulator check valve. A clear hose or sight glass would sure help. Quote glenn akers Link to comment https://www.bigmacktrucks.com/topic/18169-fuel-starving-673/#findComment-73776 Share on other sites More sharing options...
h67st Posted March 4, 2011 Author Share Posted March 4, 2011 (edited) Thanks to a tip from 16390, I tried bleeding the injector lines. #4 cylinder is dead and it's shooting air back through, so I thought I'd pull an injector from a spare engine and swap it out. I was reading the post by oldmacktrucks from January that talked about using a slide hammer, air hammer, Shel's Supplies custom puller, or ladies foot bars. Would one of these ideas be best for my old 673? I'll soak it overnight with PB and have at it; wish me luck. One other question: If I have an old 711, would the injectors be the same? Are there model numbers on the injectors? Thank you! Edited March 4, 2011 by h67st Quote Link to comment https://www.bigmacktrucks.com/topic/18169-fuel-starving-673/#findComment-73962 Share on other sites More sharing options...
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