If you pinch the return line and the pressure doesn't rise it is a pump problem. How would a regulator be able to keep the pressure low if it doesn't have a place to relieve the pressure (unless fuel is spilling out everywhere)?
If you pinch the return line and the pressure doesn't rise it is a pump problem. How would a regulator be able to keep the pressure low if it doesn't have a place to relieve the pressure (unless fuel is spilling out everywhere)?
1973 K-5 Blazer, TBI 350, TH400, 1 ton axles & 38" SSRs'
1975 280Z, TBI 350, 700R4
1953 M-38A1, TBI Buick 231
1951 Ford Panel, 5.3 with 4L80E
Normally it'll be easy because fuel is spilling everywhere. These regulators are very simple, it's just a spring and a diaphragm which works as a bypass valve and there really isn't anything to fail. If it was working properly, it should stay that way until the diaphragm fails and a leak happens or the spring rusts enough to lose it's tension. The only problems I've ever seen are leaks, anything else is a pump or line problem.
1973 K-5 Blazer, TBI 350, TH400, 1 ton axles & 38" SSRs'
1975 280Z, TBI 350, 700R4
1953 M-38A1, TBI Buick 231
1951 Ford Panel, 5.3 with 4L80E
Not all that common but I have heard a regulator spring can break or just get weak and not hold pressure. What was your pressure before?
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