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To drain tank using fuel pump...
Posted by RayF (more from RayF) on Thu, 23 Oct 2008 12:01:10
In Reply to: someone posted a method, whitesaab, Thu, 23 Oct 2008 09:52:36
...undo tiny Torx screw holding air cleaner into car, pop spring clips, unclip AMM, and lift air cleaner and I think AMM too on some models, up and out of engine bay.

No sparks wanted next, so temporarily disconnect ground cable at battery.

Then crack banjo bolt at front end of fuel rail- - big wrench (19mm? 17mm?) on fuel rail, another on banjo bolt - - don't do without the wrench on the fuel rail, it's kind of fragile.

Remove banjo (it'll spill a little gas) and pull the hollow bolt, set it and two washers aside. WITHOUT KINKING THE PLASTIC LINE, pull the fuel line back under the intake manifold legs till it clears the starter, then let it go out the front lower down below starter, into the space where the air cleaner was.

This lets you set a big can, even 5 gals., in that space, and stick the banjo end of the hose right inside it. No splashing or spills.

Reattach the battery neg. cable.

Then you have to trigger the fuel pump.

One way is jumpering two fuse terminals, I've read which only recently including I think yesterday, specifying inner of one to outer of the other I believe. Do a search.

Or, my way, pull metal trim strip, then pull carpet down on passenger footwell side panel, unplug fat plug to ECU, or at least pull its wire loom back some and look for a very skinny VIOLET (light purple) wire. I put a hardware-store crimp terminal on that, doesn't cut it but lets a 1/4" spade lug plug right into it. (Plug ECU back in if you removed it.) Then run other end of spade lug to ground. That triggers the fuel pump relay to close and fuel pump will run when ignition is turned to ON. Pumpis kind of slow. Do it over a long period of time and you will fill your 5 gallon can. Shut off, drain can, repeat till tank is at bottom. Fuel pump will pump less and start spitting air as you get there. DON'T LET IT RUN DRY, can ruin fuel pump.

I reattach the banjo bolt re-using the seal washers. Have done this with both copper and the steel-and-neoprene washers and no leaks on multiple disconnects.

I installed this tap into the violet wire on my '89 to use with a push button switch to help with long crank starts, which it did a little but not enough to eliminate them. It's on there permanently and has helped on a few ran-out-of-gas episodes, to reprime injectors without long cranking time and battery drain, to clean out tank after a disaster using gas with water in it, and to get me gas to mow the lawn without a long drive one weekend.

Works for all LH 900s.

posted by 64.222.22...
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