Been troubleshooting a P0087 code. Changed the 2 kinked fuel lines up towards the motor. No change. Just tried the vacuum gauge on the test port. Start the truck and it starts at 5inHG and steadily climbs to about 10 or 15. Once put under load it climbs all the way to 25 and stays there, even when back at idle. I reckon the fuel lines by the cooler and tank are next, although under physical inspection, there doesnt appear to be kinks. Does the tank pickup have a screen?