Medium and Heavy Trucks
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Where did you attach your test hose with the bucket? Need to attach at the fuel pump inlet port. suspect a vacuum leak, before the fuel pump.
And it would not suck fuel? Is the fuel pump drive intact? It may not be turning!
Drive not slipping? Same with the old pump?
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Hi my name is***** will be glad to help. If you can not get suction from the pump from a bucket with a hose to the pump suction it indicates a failed pump. It is a gear type pump and once worn out of specs it will no pickup the fuel. Also check for leaks and sucking in air at the lines and filter housings. Let me know the results and if we need to dig deeper.
Have you confirmed the shaft is turning and has not failed?
There is a fuel pressure regulating valve in the back of the cylinder head that can be faulty this will cause fuel starvation problems as well as any hoses sucking in air from age and dry rot.
Thanks for the update. You can always run a test line into the tank fill or a run the supply and return into a bucket of fuel to bypass the existing to verify if this is the problem. Clear hoses or a sight glass is ideal to also watch for air and fuel bleeding back. Let me know.
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