[urq] That Pesky Vacuum - Was Helicoil

[Stephen Redford]

---For sure it could have (probably did) caused the lean condition.  Vacuum  against the pump.   It could do it,   I think you might want to get another tank , but you could try to pressurize the old one.  Would be an interesting experiment.   It it did not  collapse  too far, you might just use it, but check for leaks.  I would check the pump for the correct  pressure.  It might have been damaged.  Martin might know what tanks would fit other than just Urq tanks.    There has to be some used ones for sure,  Try the Quattro World.       Hope things get better..        ...Stephen Redford '85Urq



On May 8, 2011, at 7:43 PM, AF wrote:

> So, thanks to all who offered thoughts on the spark plug helicoil. I had a
> track mechanic tap the head and install a steel insert. Worked like a charm
> and I was back to driving after installing a new plug and new coil over plug
> (which got burned up by the exhaust gasses). 1 session later I was back in
> with a misfire, this time in another cylinder in the ABZ. Well, another plug
> was finger tight and had lost an electrode or two. I replaced all 8 plugs
> just to be sure. I found another 2 that were finger tight. So someone noted
> tht lean conditions can result in this kind of damage. Righty-O. Seems that
> the sillisest things cause problems.
> 
> My gas cap has always leaked gas since doing the engine swap. 2 new caps
> later and still no solution. Martin kindly sends me a known good one, and
> boy was it a good one.  I started the car, drove 2 miles and head a loud
> pop. Thought nothing of it. Drove on the highway and found the car was
> occasionally surging and cutting out, but not totally stalling. Seemed like
> a fueling issue. Pulled over, pulled the gas cap and I could barely get it
> off, the vacuum was so strong. Fast forward 24 hours and I find that the gas
> tank has collapsed, at least the top has caved in under vacuum. Seems when 2
> bennett did the swap, they did not correctly hook up the tank vacuum line.
> It was not vented at all.
> 
> So, this might have caused the lean condition...
> 
> Questions: Can I pressurize the tank to push it out or is that too
> dangerous?
> 
> Anyone have a spare tank they'd be willing to sell?
> 
> Can someone tell me where the stock tank vent line goes on the UrQ (to the
> instake, or a carbon canister?)
> 
> Thanks so much.
> 
> Andrew Finney
> 1985 UrQ V8
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> 

Stephen R.
shr42 at msn.com