[v8volvo]

Where are you located?

Running with a plugged fuel filter, or using WVO, or both, can lead to injection pump failure. However, in every case of IP mechanical failure that I have ever known, the car has quit on the road. If it was running fine when you parked it then would not start when you went to crank it the next morning, then it is almost guaranteed that the pump is OK and there is some more minor issue going on.

First thing -- what is the current fuel mix in the pump? If you did not flush adequately and the pump is full of gelled WVO, you will not be going anywhere until there is liquid fuel suitable for running a cold engine (ie regular diesel or biodiesel) in the injection pump and injectors.

Second -- when you turn the key to "on", does the glow plug light illuminate? If not, then the fuse that runs the glow relay and powers the IP is blown. For early 700 cars this is fuse #8 and on later cars it is #13. If the relevant fuse is blown, you need to find the short is that caused the fuse to blow and then replace the fuse. Once you have ensured power to the IP shutoff solenoid, check its operation by removing the wire from its terminal and touching it on and off of the terminal so that you can hear the solenoid "click" repeatedly. If applying and removing power does not result in clicking sounds, then you have a dead or stuck solenoid, but that is an unusual unusual problem and I doubt it is the cause of your issue.

Third -- does the engine crank normally, or does its rhythm sound different? Pop the front timing belt cover loose and check that the belt is intact and not excessively loose. (When was it last changed???) Check that the rear timing belt, near the firewall, is also in place and not missing any teeth. If either of these belts is broken, then the IP will not turn.

Fourth -- maybe the most likely -- has the fuel system lost prime? Look in the translucent fuel line running from the filter head up to the IP. Is it full of fuel? Is the fuel filter tight? Assuming all of the above checks out OK, connect a hand primer bulb in-line *before* the fuel filter (connect to the filter head inlet) and pump it. Watch the clear fuel line. Fuel flowing through? Keep the injector unions loose and have a helper crank the engine while you keep (gently) pumping the primer bulb. Getting fuel to the injectors now?? Close the unions and get the engine running, then find the reason why you lost prime.

These steps should lead you to the problem and hopefully get you going again. Keep us posted on what you find out.

George