Supahonky Posted August 11 Share Posted August 11 I know the regulator is on the primer but what is this and why would someone intentionally kink the air to it? It’s an e6 motor 1 Quote Link to comment https://www.bigmacktrucks.com/topic/74450-fuel-system-help/ Share on other sites More sharing options...
Joey Mack Posted August 11 Share Posted August 11 I wonder if it is a form of reversing relay. they may have kinked it to get more ''go'' out of the injection pump... Quote Link to comment https://www.bigmacktrucks.com/topic/74450-fuel-system-help/#findComment-556879 Share on other sites More sharing options...
Mark T Posted August 11 Share Posted August 11 that is a reversing relay Quote Link to comment https://www.bigmacktrucks.com/topic/74450-fuel-system-help/#findComment-556881 Share on other sites More sharing options...
Supahonky Posted August 11 Author Share Posted August 11 So what does a reversing relay do I’m new to big diesels but been working in cars for a while. How would cutting air supply affect its function? Vac is still hooked up Quote Link to comment https://www.bigmacktrucks.com/topic/74450-fuel-system-help/#findComment-556882 Share on other sites More sharing options...
Joey Mack Posted August 11 Share Posted August 11 im am not super smart about his, but if im right, when boost gets too high, the pressure is sent to the Bimber valve on the front of the injection pump, and the valve pushes the rack in the injection pump back a bit so as to not over fuel the engine, Iguess like a governor, but using boost to regulate.. thats all I got.. Quote Link to comment https://www.bigmacktrucks.com/topic/74450-fuel-system-help/#findComment-556883 Share on other sites More sharing options...
Mark T Posted August 11 Share Posted August 11 Turbocharged Diesels have no vacuum. Or at least the certain times they do, it's not enough to matter. The reversing relay is part of the aneroid ( smoke control during turbo lag ) The reversing relay senses the manifold presure and meters the truck's air to the air cylinder on the injection pump that limits rack travel compared to manifold pressure. Some trucks will run better (and smoke a lot) with this system disabled. It's not a good idea though, as excessive fuel will wash cylinders down after a while. If the aneroid is working as it's intended to , it should run good and not bellow smoke out like crazy when lugging up from lower RPMs . Over the years there's been a couple different versions of this system, but they basically function the same way. Air goes from the parking brake valve to the reversing relay and enables the "puff limiting" With no air (parking brakes on) the rack is allowed to travel to full fuel position. This is a big help during cold starts as a cold engine requires a rich mixture to get started. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/74450-fuel-system-help/#findComment-556884 Share on other sites More sharing options...
Supahonky Posted August 11 Author Share Posted August 11 So essentially without air supply it’s dumping more fuel, are the gains worth it? How would I test for proper function if I wanted to enable the valve again. The guy I just bought it from said it blows black smoke so I’m guessing this would be a big contributor to that. Quote Link to comment https://www.bigmacktrucks.com/topic/74450-fuel-system-help/#findComment-556888 Share on other sites More sharing options...
Mark T Posted August 11 Share Posted August 11 Yes. Often when they were misadjusted or not working right in general. Disconnecting the air would make the truck run better. All the time it's smoking like that, it's basically over fueling. (not the greatest idea) They used to take some trial and error to get them shimmed (adjusted) to a point where you had power and minimal smoke. I'd imagine it'll be hard finding parts for one of them now. Never know, might put air to it and it work like a swiss watch. Someone who'd ziptie it off like that likely was doing it from being told by someone it'd make the truck run better ???? 2 Quote Link to comment https://www.bigmacktrucks.com/topic/74450-fuel-system-help/#findComment-556889 Share on other sites More sharing options...
Supahonky Posted August 12 Author Share Posted August 12 Thanks for the help guys! 1 Quote Link to comment https://www.bigmacktrucks.com/topic/74450-fuel-system-help/#findComment-556929 Share on other sites More sharing options...
cruiseliner64 Posted August 13 Share Posted August 13 Hi,i have the same problem with my E6 engine in my Cruiseliner.the Bimbo valve on the the fuel pump was leaking air so badly when the parking brake was released the air pressure would drop below 70psi and the brakes would not release fully.i put a penny washer into the pipe to stop the air from leaking.maybe thats why the your pipe was kinked....if anyone know where to get the Bimbo valve id like to know... Paul Quote Link to comment https://www.bigmacktrucks.com/topic/74450-fuel-system-help/#findComment-556952 Share on other sites More sharing options...
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