Quote:
Originally Posted by schumicat
when I disconnected that outlet line from the WUR and ran the pump (with the FD connected to the WUR inlet) a bunch of gas flowed out of that disconnected return line. So it can't be clogged. I guess that gas was coming from the fuel tank?
Another thing weird is the system pressure is way high, like 90 psi. I took off the pressure valve on the FD and it only had one shim and I removed it, but the pressure is still about 90 psi.
The thing that makes no sense to me is how 90 psi can be going into the WUR inlet and nothing comes out the outlet (with no line connected to it). How can that little metal diaphragm in the WUR seal it so nothing comes out? The only thing I can think of is that my (brand new but cheap) fuel pressure gauge kit has a valve which is not opening (stuck in closed position) so very little fuel is flowing to WUR even in the open position, even though gauge (teed on a line so it is not affected by the valve) shows 90 psi.
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schumicat,
It might not be obvious to you but I have made several tests before replicating your problem (high fuel pressure). For a
CIS to produce a fuel pressure much greater than the system fuel pressure is to restrict or block the return fuel line. So the question now is where is the blockage happening? It could be anywhere along the return line or even stuck relief valve could do it too.
The way I did it is to segregate or isolate section by section of the fuel return line from
FD and
WUR all the way to the gas tank.
You will not be able to even start the engine momentarily for a second or two with this kind of back pressure (control fuel pressure). This problem has been discussed in previous posts (old).
Of course fuel would be coming out from the disconnect return line when you ran the FP. The disconnected fuel return line is upstream (near engine) and the restriction/blockage could be somewhere downstream. I have another scenario where this buildup (fuel pressure) could happen but will reserve it for meantime.
Tony