Since his mechanic has it this may be a moot point, but the tank strainer can also cause this problem Cut the car off, or it dies, and the crappage floats away from the screen.
Nice car, nice price. Pics please when you re-buy.
And Welcome....

__________________
Jimmy L.
'05 Acura TL 6MT
2001 ML430 My Spare

Gone:
'95 E300 188K "Batmobile" Texas Unfriendly Black
'85 300TD 235K "The Wagon" Texas Friendly White
'80 240D 154K "China" Scar engine installed
'81 300TD 240K "Smash"
'80 240D 230K "The Squash"
'81 240D 293K"Scar" Rear ended harder than Elton John