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New fuel head - setup help

Installed a used AI fuel head today and it won't hold fuel pressure when pumps are turned off?
I setup the WUR not noticing this, once I had it setup I tried to start the car and it won't turn over. Went to the back of the car and a fuel puddle is coming from the exhaust. Hydro lock!
I pulled the plugs to let it dry out and back out the idle enrichment screw thinking it is holding the fuel open. But no luck? Can't hold the fuel pressure after the pumps tuen off.
Is it a bad fuel head?? Please help
Old 07-09-2014, 03:31 PM
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What is a AI fuel head?
Old 07-09-2014, 04:40 PM
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Sorry, IA fuel distributor
Old 07-09-2014, 06:55 PM
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Oh ok.. Thats a CIS Flowtech modified fuel head that they sold and put their own name on it. Hard to say what's going on with your system from the description if it's a used fuel head. Could be the fuel pressure regulator in it has problems.
A CIS fuel pressure gauge is needed to really diagnose things without replacing or rebuilding parts till it runs right.
Hopefully a connecting rod wasn't hurt when it hydrolocked on the starter motor.
Old 07-09-2014, 07:04 PM
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iA had CIS-FT modify fuel heads for them that were turned up to max which is way too much fuel for most applications. After they went under I worked with Larry to gather as many as I could find and turn them back down to the proper level for the engines.
What you are describing is a major malfunction. Could be a stuck regulator as Jim stated or one of the valves. You would be best served to send it back to Larry for repair and recalibration so when it is fixed it will work properly with your engine.
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RarlyL8 Motorsports / M&K Exhaust - 911/930 Exhaust Systems, Turbos, TiAL, CIS Mods/Rebuilds
'78 911SC Widebody, 930 engine, 915 Tranny, K27, SC Cams, RL8 Headers & GT3 Muffler. 350whp @ 0.75bar
Brian B. (256)536-9977 Service@MKExhaust Brian@RarlyL8
Old 07-09-2014, 07:59 PM
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Thanks guys. I will put my original FD back in.
I think I have had enough of cis now. Thinking of selling my car to more onto a new project.
Old 07-10-2014, 02:45 AM
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Quote:
Originally Posted by flat_6 View Post
Installed a used AI fuel head today and it won't hold fuel pressure when pumps are turned off?
I setup the WUR not noticing this, once I had it setup I tried to start the car and it won't turn over. Went to the back of the car and a fuel puddle is coming from the exhaust. Hydro lock!
I pulled the plugs to let it dry out and back out the idle enrichment screw thinking it is holding the fuel open. But no luck? Can't hold the fuel pressure after the pumps tuen off.
Is it a bad fuel head?? Please help
Had the same issue long time ago. I was making the car ready for new paint, and had almost no fuel in the tank, so I stole some gas from my dad but there was no fuel in the can but water! Had to swap the fuel head and clean the gas tank. I was lucky having another one from a lokal dealer that had a 930 engine with a broken crankshaft. bought it for $400 and all was fine again.
I thought about selling my 930 to because I had a hard time getting all those stuf fixed.
To be honest, it took me almost six year to get the car running like it supposed to do.
Now she runs strong with everything working and still happy to have her.
We all are so lucky that we have this forum where a lot of good people are willing to help the newbies, like I was I'm not a specialist but after years of reading on the forum I can do most of it myself. Those cars are old and fun! but they do need a lot of love and patience and $/€!
Old 07-10-2014, 09:09 AM
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o-ring

i had the same issue with my 91 turbo. bended a rod this way. i disassembled the fuelhead to find out why i lost that much money and found that one o-ring failed. there is the plunger that moves up and down. its case has little rings arround every slit. one of these was gone. so the fuel was pressed through the weakest injector and filled one cylinder with fuel. not enough for water lock in my case so it turned and then hit the rod. in your case it seems there is more than one ring gone.
Old 07-12-2014, 10:40 AM
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I know the oval shaped o-rings around the fuel head control plunger chamber you're talking about and wow that sucks... This is the first time I've heard of a connecting rod getting bent because an o-ring in the fuel head took a s... and flooded a cylinder hydro locking it while cranking the motor over on the starter motor..
Old 07-12-2014, 12:16 PM
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I think I might be lucky in that when I went to start the car it didnt even attempt to turn over. The starter just clicked. Once i pulled the plugs and waited a day, I turned the car over with no fuel, ignition and plugs still out to clean out the remaining fuel. It turned over immediately and sounds completely normal.
Old 07-14-2014, 04:39 AM
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