Be grateful of any help please.
Discussion
Hi Everyone, I’m new to this group and forum, reason for my joining is that, I’d be very great full of some help and support for a lorry that I’m working on for a friend. It’s a Daf Leyland 45/150 Cummins 6bt (I believe it is) it’s a 6 cylinder Cummins, I know that for 100% but I am sure it’s a 6bt when googling it. Basically you start the lorry up and the idle is rough, then put your foot on the accelerator and it picks up the revs slightly and foot to the floor all you get is a fast idle. When you take your foot off the accelerator the engine stalls and you have to prime it on the lift pump in order to get it started again. Between me and a friend we got her started and I loosened the bleed nut on the side of the fuel filter housing, some air bubbles emerged and the revs started picking up again but then the revs went down and it died. I have checked up and down on this lorry for cracked hoses, etc, replaced the filter and the seals. I also have some new fuel lines coming in the post. Currently there are nylon fuel lines on the lorry and I am replacing them like for like. I mean can nylon lines go old and horrible inside? But after the fuel lines have been replaced if it still carries on what’s next? The whole system is old school. You have a tank and fuels lines, lift pump, injector pump. It’s a simple old set up. I don’t think there is a fuel pump in the tank? However we got the lorry running really nice one day but there was a leak on the injector pump and when the lorry was running it was spraying out of a nozzle on the injector pump. Tightened it up but that leak almost seemed like an escape path for the air? But now I’ve tightened it up and we’re back to square one? Any help please would be really great. I like and enjoy playing with engines but I’m no pro, I am still learning and would like to keep learning. Thank you all for your time and sorry for the long post. Thank you x
Edited by Deereman on Monday 9th March 14:02
Edited by Deereman on Monday 9th March 14:03
The first place I would start to look for your problems is the fuel pickup stand pipe in the Tank, it maybe cracked or the filter on the bottom of it could be blocked. The easiest way to eliminate that is to run a pipe direct from the lift pump into a can of fuel, that'll let you know if it's the pipe work that's at fault. If that's okay I would then remove the fuel pipe after the filter before the main injection pump, get someone to crank the engine over to see there's a good flow of fuel from the lift pump via the filters.
I am no expert on the Cummins B engine but I worked a lot on the E Series in 70's and 80's. From images I have seen the engine appears to have either a rotary or inline pump depending on engine model, Which is yours? The only other thing that it could be is a worn seal on a shaft on the Injection pump drawing in air or a faulty pump itself. Where ever copper washers are used make sure you fit new ones as they could very easiley pull in air.
If you have no luck I know of someone at Stoke that specialises in the Cummins B engine.
I am not sure what type of fuel tank your vehicle has but the filter is a the end of the pickup pipe in the tank, it's usually incorperated with the fuel gauge sendor unit and it's often refered to as the stand pipe. It's no use fitting new pipes if the fuel pick up filter is blocked.
An inline Diesel pump will have six injector pipes in that, a staight line and a Rotary pump the injector pipes will be position in something like a circle. There's usually an air bleed nipple somewhere on the pump. I hope that's of some help.
An inline Diesel pump will have six injector pipes in that, a staight line and a Rotary pump the injector pipes will be position in something like a circle. There's usually an air bleed nipple somewhere on the pump. I hope that's of some help.
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