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Hi all, over the last few months my 6.5 chevy diesel has been struggling to start when hot. 1st thing in the morning it fires up straight away or even after standing for around 20 to 30 mins, but if I stop to put fuel or try to start within 15 to 20 min it won't start. like no fuel going through to the injector pump. does any one think it could be starter related, or maybe cut off solenoid.
Thanks in advance.
Colin.
Any chance its vapourising in the fuel line. Heat from the engine when you stop rising and turning the fuel in the line to vapour. Once it cools down its ok again. Try wrapping or insulating your fuel line in the engine bay. We used to get this a lot when we were racing cars. Usually because we had fuel line above or too close to extractors. Wrap, insulate or move used to fix it.Quote:
Originally Posted by brooks
Just reread that, probably not in a diesel. Possible I suppose but not likely. I just read the symptoms and jumped in. Sorry.
The chev should have a lift pump between the fuel tank and injector pump, probably mounted on the inside of the chassis rail. Is this running - you should be able to hear a 'tap tap tap' sound. This might get hot and stop. Is your a turbo or N/A? I have the n/a and the pump is on the drivers side away from the exhaust - unsure what the turbo exhaust route is? The lift pump would also struggle if the tank breather was blocked and it was pulling a vacuum on the tank. I had a problem with a partially blocked fuel line also that killed the motor under power, have you checked the inline filters? There should be one before the lift pump, then you have the main fuel filter. Does it just crank and not fire or try to start and stop straight away?
G'day Brooks, the yanky forum sites for 6.5s seem to talk a lot about their PMD's overheating. They all seem to buy an aftermarket Pump Mounted Driver relocation kit. Just google up words like above and see if their symptoms match what you're experiencing maybe?
Could be the pmd but sounds very much like the ip is worn out. The pmd if your has one is cheap enough to replace and relocation kits are easy to source. If its a brunswick conversion it is unlikely it will have a pmd as they seemed to be scared of electronics.Quote:
Originally Posted by brooks
Either way buy the parts out of the states last time I quoted to get a 6.5 chev pump done over here was in the range of 3500 supply only.
Mine is N/A, it is fine when running, just cranks & won't fire when hot, as soon as it cools cranks a few times & starts. i might try to change the filters & will check the lift pump.
Please expand PMD, do you mean injector pump is mechanical. yes it is a brunswick conv.
As the blokes above suggest no doubt your lift pump/fuel line area so please disregard my yanky suggestion. Mine's an NA tractor with no PMD too done by GTS Bunbury, so probably same as Brunswick like Nissannewby suggests. The pumps are up so high on these things that fuel lift is critical I believe, not sure of the psi required but I think I read somewhere in the vicinity of 8psi and flow rate unsure of but could be wrong there too. The electric drivers PMD were apparently poorly design placed directly on top of the pump in the hope of incoming fuel to cool them which going by the wave of yanky youtube vids and forum discussions must have been terrible.
This blokes symptoms and quick fix for an example:
https://youtu.be/dC469cTqGg8
Yeah I'd say the ip has had it mate. See when you stop and due to the location of the pump on these they heat soak like no tomorrow and with it being worn already the extra heat throws all the clearances out and you dont get any fuel out to the injectors.Quote:
Originally Posted by brooks
What I can suggest until you get a replacement is carry a good amount of water with you. So when you stop to refuel etc pour a heap of cool water over the ip and it will start easier. This is only a very temporary thing though.
Why not give Scotty a call at BD and outline the issue - regardless of whether you elect to go with them or not, they will likely have come across this already.Quote:
Originally Posted by brooks
Pmd- pump mounted driver.Quote:
Originally Posted by brooks
They were fitted on the later chev engines with stanadyne ds-4 pump. Basically they have some basic electronics for control of fuel. It has a small loom with 4-6 wires from memory. It is fairly common for these to be remote mounted as they are factory fitted to the pump and the heat just kills them.
But I am unaware of brunswick using these as last time I spoke to them they removed them and just put them to the side and used the earlier ds-2 pump as they are mechanical and easier as such for them to use with their conversions.
That could be handy Mat, wonder if they'd maybe sell them cheap if they're just laying around. I guess they might also flog them back to the yanks to recoup some costs. Just thinking if ever our pumps were to crap themselves could be an option if they're any good when installed and setup correctly?
this has a mechanical lift pump on RH front of block. appears to be working ok.
the link is quite interesting, thanks. mine runs good when started but will that cause no start when hot.
thanks will definitely carry a water bottle, how will water go on the heads though, hope they won't crack.
Ok, I am out on this one. Mine is electrical lift pump on chassis rail, pumps at 14psi.Quote:
Originally Posted by brooks
I think he means to just pour water on the injector pump housing.Quote:
Originally Posted by brooks
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Will be fine mate. Just use room temperature water. And pour it on slowly.Quote:
Originally Posted by brooks
I do but brooks concern is warranted at the ip is in the valley of a 6.5 chev. So pouring water on it means water in the valley.Quote:
Originally Posted by Turtle_au
The later electronic ones would require the associated sensors etc to work correctly. Its certainly not out of thr realm of possibility but would be a lot easier of they just wired them in when doing the conversions instead of swapping them all to the mechanical ones.Quote:
Originally Posted by MB
Ok didn't realise location. No wonder it gets so hot.Quote:
Originally Posted by nissannewby
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good. i might give them a ring next week.