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308 fuel valve
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Posts: 12From: Roslyn HeightsRegistered: Apr 2004
moskojo
Junior Member


Sunday, March 15, 2009 8:44 PM

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I have a 1978 308GTS. Recently the car came to a dead stop due to fuel starvation. I have 30,000 miles on it and am the original owner.
Since it was due anyway, I replaced the fuel filters( including the in-tank one-expensive) and took the opportunity to replace all the fuel hoses. I also did a full tune-up. After I was done, it still would not start. Checked the carburetors and they were dry. Still not getting fuel to them. So I checked the fuel pump, but it was running. So I disconnected the output hose and turned it on, only to get a trickle of fuel. Then I disconnected the input, and only a trickle was coming from the hose. I then disconnected the output from the new fuel filter, and fuel poured out. Between the output of the filter and the fuel pump is a valve, so I bypassed the valve, and not only did the car start, but it started immediately, whereas in the past it would be hard starting. The valve must be blocked, and must have been defective for a long time.
Examining this valve makes it look like a pressure diaphragm connected to the output of the fuel pump (via a 3 way hose bib on the outlet). I assume that it functions by decreasing flow to the pump if the pressure rises too high.
In attempting to find a replacement, I check Ricambi America and their parts diagram does not show this vale, neither the European nor US versions. My owners manual clearly has a picture of it.
So since it is not shown in these diagrams, how safe is it to operate the car without it?
Another interesting thing is that the valve does not have a flare on the tube for the pump output hose. I would think that this is a safety issue as the hose could come off even with a hose clamp on it, spewing fuel directly from the fuel pump, causing a fire.
I am attaching photos of the valve, the owners manual picture and the 2 parts diagrams.( In different messages, I can only attach 1 to each message)




valve.jpgvalve.jpg  (139 Kbytes)
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Posts: 12From: Roslyn HeightsRegistered: Apr 2004
moskojo
Junior Member


Sunday, March 15, 2009 8:45 PM

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This is the owners manual picture




owners.jpgowners.jpg  (267 Kbytes)
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Posts: 12From: Roslyn HeightsRegistered: Apr 2004
moskojo
Junior Member


Sunday, March 15, 2009 8:46 PM

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This is the European parts diagram




europe.jpgeurope.jpg  (308 Kbytes)
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Posts: 12From: Roslyn HeightsRegistered: Apr 2004
moskojo
Junior Member


Sunday, March 15, 2009 8:47 PM

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This is the US parts diagram




usa.jpgusa.jpg  (225 Kbytes)
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