V518 Versahandler with a bizarre fuel problem

Sniffy · Dec 29, 2019

I have a Bobcat V518 Versahandler with a bizarre fuel problem.
Starts fine
Idles fine
It won't respond to the throttle at either the pedal or at the lever attached to the fuel injection pump. It just continues to idle at 750-1000 as you twist away at the pump lever. The lever travel action seems normal.This is a mechanical injection pump (Delphi 210? - its tagged as Perkins 2644HO13 and 9320A212G).
At first I thought that it was your typical fuel starvation issue so I put in a new filter, cleaned the fuel tank, checked the lines, and tested the electric transfer pump for flow/pressure. All good. I even checked the Schematics for some hidden relay/PCM/controller/bobcatism that would throttle it at idle regardless of operator input. nada...
Has anyone had one of these pumps apart and are there any 'breakables' under the top cover that would prevent the twisting action of the lever from = more RPM ?

ruffdog · Dec 30, 2019

Sniffy said:
I have a Bobcat V518 Versahandler with a bizarre fuel problem.
Starts fine
Idles fine
It won't respond to the throttle at either the pedal or at the lever attached to the fuel injection pump. It just continues to idle at 750-1000 as you twist away at the pump lever. The lever travel action seems normal.This is a mechanical injection pump (Delphi 210? - its tagged as Perkins 2644HO13 and 9320A212G).
At first I thought that it was your typical fuel starvation issue so I put in a new filter, cleaned the fuel tank, checked the lines, and tested the electric transfer pump for flow/pressure. All good. I even checked the Schematics for some hidden relay/PCM/controller/bobcatism that would throttle it at idle regardless of operator input. nada...
Has anyone had one of these pumps apart and are there any 'breakables' under the top cover that would prevent the twisting action of the lever from = more RPM ?

How many hours does it have? Check the air filter housing and supply tube for blockage, like a mouse nest.

Sniffy · Dec 30, 2019

Air intake looks good and at 1800 hours it was running fine until parked overnight. In the morning it was non-responsive. I would expect that if it were a fuel/air starvation from a blockage that I would have a slight rpm increase before falling flat on its face but the rpm stays unflinching at 750.
I double checked the input shaft retaining nut and that was tight.

ruffdog · Dec 31, 2019

I have heard others talk about a frozen, stuck, worn injection pump racks. I know you don't force those things.

A frozen Injection pump Fuel Rack, what to do? - UtterPower.comUtterPower.com