The fuel filter is located near the right rear wheel bolted to the chasis.
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Look under the Trooper and count them.
According to rockauto: HONDA PASSPORT EX (1994 - 2002) HONDA PASSPORT LX (1994 - 2002) ISUZU AMIGO (1998 - 2000) ISUZU AXIOM (2002 - 2004) ISUZU RODEO (1993 - 2004) ISUZU RODEO SPORT (2001 - 2003) ISUZU TROOPER (1998 - 2002) ISUZU TROOPER LS (1992 - 1997) ISUZU TROOPER LTD 1997 ISUZU TROOPER RS (1993 - 1995) ISUZU TROOPER S (1992 - 1997) ISUZU TROOPER SE 1996 ISUZU VEHICROSS (1999 - 2001) TOYOTA T100 (1993 - 1998) TOYOTA T100 DLX 1995 TOYOTA T100 DLX EXC 1995 TOYOTA T100 ONE-TON 1993 TOYOTA T100 ONE-TON DLX 1995 TOYOTA T100 SR5 (1993 - 1997)
on the exhaust manifold.
If like my 2000, it is on the left valve cover. it is too cold to go out and double check.
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Under the intake mannifold (you have to remove it to get to it).
There is only a pleated paper filter that is not replaceable. The only reason that I know it is there is because I ripped the dash out of one in the junk yard to get at the instrument panel. However, you can't order a replacement, so I think that is was meant to more or less keep large debris out of the system and not actually filter the air.
1.65 pounds. It's on the sticker on the driver's side of the firewall.
It's in the fuel tank, like on all modern vehicles.
My 1999 Trooper gets about 16 MPG with mixed highway and city driving. I believe that it has the same drive train as the 2001. If I drive at moderate speeds on the highway, I can get 19 MPG.