I'm burning WVO in my 1984 Burb. Everything was running fine until yesterday. I drove aboue 2 miles to my shop and in the parking lot, it stalled. I opened the hood and saw fuel leaking from the fuel pump, so I figure the fuel pump might be bad letting air into the system. So I replace the fuel pump drive around the parking lot, and all is fine. Drive the truck to my new shop (about 2 or 3 miles) and just as I pull into the parking lot, she stalls. I figure at this point, maybe the fuel filter is clogged, so I replaced it (and bled the air the proper way) and she started up, and stalled. Now I'm thinking that possibly there is a screen inside the IP, like my F250 6.9 diesel had. Could be that the crud deposited over the years was cleaned by the WVO and that the screen is clogged up. I don't think it is the tank strainer simply because when the vice grips unclamped, the WVO flowed through the fuel line without restriction. I managed to drive the truck back to the old shop, mostly in L2 or L1 where as long as throttle was applied, and RPM up and fuel consumption low, the truck would run. As soon as I removed throttle she would stall. Where's the screen?