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Re: [GMCnet] FITECH Mystery solved [message #328539 is a reply to message #328512] Tue, 23 January 2018 10:40 Go to previous message
Larry is currently offline  Larry   United States
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Registered: January 2004
Location: Menomonie, WI
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SONICJK wrote on Mon, 22 January 2018 18:41
Good to know Jerry thanks for the update.

Larry, why would the pressure build past the regulator? The fitech already has a built in regulator, and you've added another. Curious where the spike in pressure is coming from. Boiling fuel from heat soak?



I have not added another regulator YET. Just considering putting another in because it worked so good with the MPI system I had. Yes, the Fitech has a built in regulator. It works with the Fuel Command Center, regulating and returning fuel to that FCC. My Fitech is dead headed. The regulator is located back at the tank and regulates and returns fuel before it goes to the TB. Boiling fuel from a heat soak builds pressure and since the TB is dead headed, (no return line from the TB) and the engine is not running to relieve the head soak pressure, the pressure has no where to go, so builds to a point that it holds the injector pintles closed, and no start for lack of fuel. Cracking open the plug on the TB relieves the pressure and allows the pintles to open and engine to start. By putting another FPR on the output side of the TB set to 15 or 20lbs higher than the running pressure, it allow s the engine to run normally. When heat soak occurs and the pressure gets to 70lbs or so, the return regulator bleeds off excess pressure allowing the pintles to open and engine to start. It worked on my old system, should work on this. I've talked to tech support at FiTech and they concur. Just my theory on what's happening here.


Larry Smile
78 Royale w/500 Caddy
Menomonie, WI.
 
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