DB 996 Not revving as high as it should
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DB 996 Not revving as high as it should
Hi all,
I have a DB 996 and it only revs to 1600 rpm. It used to rev more.
I was wondering what could I check on this to make it run better?
thanks
Martin
I have a DB 996 and it only revs to 1600 rpm. It used to rev more.
I was wondering what could I check on this to make it run better?
thanks
Martin
RE: DB 996 Not revving as high as it should
When were the fuel filters last changed ? Also what is the bottom of the fuel tank like ?
RE: DB 996 Not revving as high as it should
Fuel filters last year, probably time to do again.
not sure about the fuel tank, don't know how to check.
thanks
not sure about the fuel tank, don't know how to check.
thanks
RE: DB 996 Not revving as high as it should
Have you ever cleaned the plastic/nylon gauze filter in the injector pump? It's under the larger union fuel pipe from the front fuel filter so perhaps you can check it when changing the filters.
The rate that the fuel comes into the lift pump sediment bowl will give a good indication of any restriction in the fuel tank but I would also be inclined to clean out the lift pump as well, glass bowl, metal gauze, if there is one, and the recesses in the body of the pump, they also fill with sediment.
The rate that the fuel comes into the lift pump sediment bowl will give a good indication of any restriction in the fuel tank but I would also be inclined to clean out the lift pump as well, glass bowl, metal gauze, if there is one, and the recesses in the body of the pump, they also fill with sediment.
RE: DB 996 Not revving as high as it should
Check the security of the throttle linkages and connections. Check the movement and security of the throttle lever on the pump
Disconnect the throttle rod to the injector pump and rev it up directly on the lever on the pump. If it runs at full revs then it's a problem with the throttle linkage. There's various pins and clevises etc that can wear in the linkage causing play resulting in excess travel within the throttle linkage system.
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Check all the filters - sediment bowls, lift pump gauze, injector pump gauze, check the linkage is giving full movement at the pump, then check you have a good flow of fuel from the tank to the lift pump.
If everything seems good then suspect the lift pump, it may not be delivering enough fuel. There is a strong possibility that the plunger which operates it has worn meaning there is nothing wrong with the lift pump but it can't operate fully. You could try with the throttle wide open and pumping it by hand as fast as you can, see if it improves the revs.
Also remove the air filter hose at the manifold to check there isn't a restriction, such as a collapsed hose. You should see loads of black smoke if this is the case, but it pays to check.
If everything seems good then suspect the lift pump, it may not be delivering enough fuel. There is a strong possibility that the plunger which operates it has worn meaning there is nothing wrong with the lift pump but it can't operate fully. You could try with the throttle wide open and pumping it by hand as fast as you can, see if it improves the revs.
Also remove the air filter hose at the manifold to check there isn't a restriction, such as a collapsed hose. You should see loads of black smoke if this is the case, but it pays to check.
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