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Are you sure it is vaccume you are hearing? The tanks in our trucks are pressurized to prevent vapors from excaping into the atmosphere. Could the noise you hear be pressure excaping when you open the cap?
If pressure is building up then replace the cap. If you leave it off or loose then you will get a code from the eprom.
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Black 1997 F-150 4x2 Supercab Flairside with HD tow package, Sunroof.
2002 Lightning headlights.
Steel Horse billet grill with Blade Runner (I just love chrome).
Prestiege air dam.
4.6L with Superchip, K&N Generation II modified to use with Supercharger, Accel Coil Pacs, Troyer fans, Troyer trans cooler, Cat back Exhaust with Flowmaster Super 40 2 1/2" in and Duel 2 1/2" out with 3 1/2 Stainless tips out the back.
S.E.C. Polished alloy wheels, Style 27 (17X8) with 265/70-17 Bridgestone Dueler A/T Revo’s tires. Hellwig 1 7/16 front and 1 1/8 rear bar. Eaton Limited slip, 4.10 Ford Racing gears, TrickFlow rear diff support girdle.
Pioneer head unit with Cerwin-Vega 5x7's all around and Rockford Fosgate Sub in custom box with 300 watt RMS amp "THUMP-THUMP".
http://www.f150online.com/galleries/....cfm?gnum=1496
Powerdyne Supercharger at 9lbs, 42LB injecters, 90MM MAF, Superchips 4 program chip.
JBA Jet coated headers
How fast am I you ask;
"Slower then John Force... Fast enough for me and exactly as fast as I can afford"
NOW 9 YEARS OLD AND STILL TURNING HEADS!!
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