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931 fuel system question on bringing it back from the grave

 
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Wdog  



Joined: 06 Jan 2020
Posts: 1
Location: Denver CO

PostPosted: Tue Jan 07, 2020 4:46 am    Post subject: 931 fuel system question on bringing it back from the grave Reply with quote

First off, thank you for having this board. I've read through many of the posts regarding the fuel systems and resurrection thread. Very good posts. Very informative and everyone seems to be very helpful. Not all car boards are this helpful, so thank you guys.

I recently purchased a 1980 924 Turbo that was described as an "easy project", "ran when parked", should start with a little work type of thing. I've always liked the 924. This wasn't expensive and I had plans in mind for this and wanted to learn more about the 924 anyway. Before I get too far on this, let me say... the car is not in great shape. In fact...

Every panel of the body has dents, dings
Drivers door window had been shot out
Its a badly faded, poor paint job
The hood was replaced and just scratched primer
The interior is epic, but sadly worn, torn, faded and cracked.
All four tires were badly dry rotted to a point where I've only seen old farm equipment with worse tires. Two of them were cracked open on the side walls.
Sunroof didn't seal and moisture had collected in the passengers floor pan
The list goes on...

Before deciding to part this out or do something else with it, I wanted to see if this will run and if it would be a candidate for something else.

That said... I started with the fuel tank. Cleaning the tank, removing the in tank filter, flushing it for days with kerosene which seemed to really work well. The filter had been removed for quite some time so I started flushing the fuel lines backwards from the fuel distributor and cleaning everything as I went.

As this car is on the bubble and is probably not even a good candidate for restoration, I wanted to see if this will run before I get too much money in it. The oil looked good and the engine bay looks surprisingly good, other than the red overspray from when it was last painted. I fogged the cylinders to ensure everything had some lubricant in there.

I was able to get past the first milestone and get the engine to fire. Please forgive me if this was a no-no on these engines, but I've done this on lots of old resurrections I've done. I was able to get it to fire and run on ether. Not long, but enough to ensure it sounds correctly with no knocks or and the engine isn't trashed.

All that said (sorry for the long post), the next milestone is getting it to fire on its own fuel system. From what I've read and correct me if I'm wrong, but the high pressure fuel pump needs 65psi to fire the injectors. I am waiting on a new fuel pump as I clean the original one on the car. Now that the fuel system is flushed and clean, should this car start on its own or is there another step I should do first? It would be great to get it to start on its own fuel. If it doesn't start, what's the tipping point of saying... discontinue the project and go another direction. Again, this was inexpensive and a gamble. I don't see this car as a candidate for a street car in the future, but possibly limited budget autocross, rallycross, but still street legal.

Thoughts? Again thank you for having a great board here.
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Fifty50Plus  



Joined: 28 Feb 2008
Posts: 1063
Location: Washington DC area

PostPosted: Tue Jan 07, 2020 9:38 am    Post subject: Reply with quote

Congrats so far. Next step is to get fuel through the fuel distributor up front and out the injectors. All can be tested by removing the injectors and placing them in bottles, powering the fuel pump, lifting the AFM by hand and seeing if you get fuel into the bottles. Check for even quantities. If that works, hook it all back up and run it.
_________________
1979 924 NA race car
1982 924 NA race car - Sold
1982 924 Turbo almost a PoS
1981 924 Turbo a real PoS, new engine
1982 924 Turbo nice body, blown engine
1972 911 E race car - going to Vintage
Various 944s to become IT-S race car
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!tom  



Joined: 28 Aug 2006
Posts: 1887
Location: Victoria, BC Canada

PostPosted: Tue Jan 07, 2020 9:52 am    Post subject: Reply with quote

Timing belt?
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78 924 NA
5-lug
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