I need to lower my gas tank on a 95 bonneville.I have a rusty leaking line by the top of the gas tank which i cant reach
Ooh man, good luck, I had that happen on my 95 lesabre (same frame and gas tank) and my 97 bonneville...
Memories are really fuzzy, but I'll try...
Warning:!! You are probably going to need a new tank (they usually rust uniformly so one hole usually becomes many), the sending unit will probably be rusted to nothing, the bolts holding the straps up will probably have to come out in pieces, and the speed nuts for the strap bolts are probably rusted away.
Back up the car onto a pair of wheel ramps, you'll need lots of space underneath the rear of the car.
Syphon out as much gas as you can, because when you do finally get it down that ****** is heavy with lots of gas in it.
The two filler hoses which attach to the side of the tank are usually a bi+ch to get off, but can be done, try not to cut the hoses too bad, I honesly can not remember if you take off the hoses before or after dropping the tank... (sorry) It is helpful to syphon more gas out once you get the filler hoses off.
*try* to get the two bolts holding the straps up, if anything like my experiences, the cheap speed-nut hinges rusted away to nothing years ago and turning the bolt means turing the back of the speed nut (which means you aren't going to be able to get the bolt out that way). What I did was drill out the center of the of the bolt, starting small and working my way up until the center of the bolt was hollow enough for me to snap the head off, breaking those off will free the tank, make sure you have a hydraulic jack with a piece of wood centered under the tank in case it is still really heavy. The straps slide in a pocket on one side of the tank and bolt on the other, you may want to consider moving the straps so the weight of the tank doesn't bend then because if they get bent it is a pain to get them to reach the hole when reinstalling.
the tubes and wires connecting to the sending unit are usually pretty flexible, so you should be able to lay the tank on the ground while removing the sending unit, be forewarned that the sending unit is probably in rough shape and if you are going to replace that too you probably arent going to be able to get the hoses out without breaking the sending unit tubes in the hoses, some penetrating oil will lessen the impact (that was my case anyways, my sending unit was leaking worse than the tank on my lesabre! if your sending unit is still in good condition, you're lucky). There are little retaining clips that keep the tubes in the hoses by latching over a lip on the tubes, you may end up breaking those, so be prepared to look for some new ones at the store.
You get the sending unit out by taking a flat head screw driver, and gently banging on the tabs of the seal retaining ring around the base of the sending unit, there is a gasget under there, make sure you start at one corner while trying to tap it off and move around the metal ring to get it off. When pulling the sending unit out, watch out to not knock the sock off (there are plastic posts on the bottom of the sending unit which can get cracked off and won't hold on the sock anymore, and also the float guage for the fuel level has a weird shape to it, don't bend it or catch it on the way out of the tank.
Once you get it out the tank you can see your fuel pump, and all the **** at the bottom of the tank the sock on the fuel pump (hopefully still present) has been blocking from getting in the $100 fuel pump!
To re-install, reverse steps, but with new bolts and speed nuts and you may want to put some penetrating oil on the filler holes before you reattach the filler tubes, makes reinstallation much easier. Make sure to reattach all hoses and wires to the sending unit!
Use the jack and board to GENTLY lift the tank back into the vehicle so you'll have an easier time reinstalling the straps. obviously dont crush the tank, sending unit, wires, etc...
This is probably missing steps, but should get you most of the way there, hey, if I could do it in the dead of winter over xmas vacation with litt help or preparation, and only a little frostbite on my feet, you can too!
Enjoy-- I hope you still attempt the repair because bonnevilles are nice cars, I miss mine, the repair is a pain but the motors last forever if taken care of, and if you don't already have transmission problems, that tranny is a beast too!
Apr 10, 2009 |
1995 Pontiac Bonneville