Driftinrican Posted September 14, 2014 Share Posted September 14, 2014 Ok I have a 1977 Datsun 280z. So far bone stock. I just checked the fuel pressure today and found 80psi of pressure. Way too much. So my big question is what after market fuel rails and regulators will fit with little to no mods on the stock injectors? My current goal is to get the car running reliable first with performance mods made later. I have tried to search here and I have not found any thing that I'm looking for. If someone can post some links of what setups and systems work best with NA L28E engines. Quote Link to comment Share on other sites More sharing options...
NewZed Posted September 14, 2014 Share Posted September 14, 2014 Sounds like you have the lines reversed on the fuel rail. This pumps in to the outlet of the FPR, leading to maximum fuel pump pressure on that line. Bet if you checked you'd find that no fuel is flowing in the return line. It's deadheaded at the FPR. The typical aftermarket fuel pump will hit 80-90 psi. Quote Link to comment Share on other sites More sharing options...
Tony D Posted September 15, 2014 Share Posted September 15, 2014 Fix your problem first, then worry about the fuel rail and other moneywasters. Quote Link to comment Share on other sites More sharing options...
Driftinrican Posted September 15, 2014 Author Share Posted September 15, 2014 Ok so I just rechecked how my fuel lines went into the fuel rail. From the filter it goes into the top line that feeds the injectors first then the regulator out to the return. I believe this to be correct. So just to verify I want to make sure. Quote Link to comment Share on other sites More sharing options...
NewZed Posted September 15, 2014 Share Posted September 15, 2014 There's a diagram in the FSM if you really want to be sure. Your description sounds right though. If it is, then you have a blockage of some kind, either before the FPR, at the FPR, or after the FPR. The FPR is just a valve that builds up pressure to a certain point then lets fuel by when that pressure is reached. Measure pressure on the return line. If there's high pressure there, then you have a blockage between the tank and the gauge. If there's no pressure, and no fuel flow, then you have a blockage between the return line and filter. Just logic it out. As noted though, replacing parts before understanding the problem won't get you anywhere. Make sure that your gauge is correct also. One last thing - where exactly are you placing the gauge? If it's before the filter you might just have a clogged filter. Quote Link to comment Share on other sites More sharing options...
Driftinrican Posted September 15, 2014 Author Share Posted September 15, 2014 Currently the gauge is between the filter and the fuel rail. I do have a spare stock rail so I think I'll clean it up and make sure I have no blockage there. I'll check the return side after I get a new rubber hose mine just split taking it off. But that will have to wait until tomorrow. Quote Link to comment Share on other sites More sharing options...
NewZed Posted September 15, 2014 Share Posted September 15, 2014 Does fuel come out of the return line? Run it in to a gas can. That's even easier than connecting the gauge there. There are many ways to figure out where the blockage is. Quote Link to comment Share on other sites More sharing options...
Driftinrican Posted September 15, 2014 Author Share Posted September 15, 2014 Started it up real quick and only a few drops came out. Not a steady stream. So I either have a blockage in line or bad regulator. So for now I'm going to clean up my extra rail to make sure it's not the line. If I still have an issue I'll replace the regulator. Quote Link to comment Share on other sites More sharing options...
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