dmoralesbello Posted October 19, 2016 Share Posted October 19, 2016 (edited) I'm planning on installing an inline fuel pressure gauge in the engine compartment of my stock EFI 1978 280Z. I would appreciate suggestions as to where to locate it (outgoing line from the fuel filter, in the fuel rails prior to the regulator, etc.). Where have other members placed their fuel pressure gauges? Any help (especially pics) would be appreciated as always. Edited October 19, 2016 by dmoralesbello Quote Link to comment Share on other sites More sharing options...
ZHoob2004 Posted October 19, 2016 Share Posted October 19, 2016 I just put one between the filter and the fuel rail, seems accurate enough to tell me the regulator is working and nothing's clogged. Quote Link to comment Share on other sites More sharing options...
dmoralesbello Posted October 19, 2016 Author Share Posted October 19, 2016 Thanks ZHoob, do you have any pics? Quote Link to comment Share on other sites More sharing options...
ZHoob2004 Posted October 20, 2016 Share Posted October 20, 2016 Not at the moment, but it's fairly straightforward. I got a 1/8 npt gauge off amazon, a matching tee fitting from a local hardware store and I already had the 5/16-1/8 npt hose barbs. Add some thread sealant and a couple clamps and there you are. Quote Link to comment Share on other sites More sharing options...
Tony D Posted October 20, 2016 Share Posted October 20, 2016 There is a fuel pressure sending unit for some OEM EFI systems that runs on the same 5V power... pretty accurate and used in the newer systems to trim injector pulsewidth for proper emissions calibration. They also have a temperature sensor, so basically they are now calculating BTU content of the fuel by density and adjusting accordingly.A little circuit board work, and you could have a nice accurate gauge (might be something out there already...)Far better than most analog gauges I've seen/tested in the engine bays on most cars. FWIW Quote Link to comment Share on other sites More sharing options...
dmoralesbello Posted October 20, 2016 Author Share Posted October 20, 2016 There is a fuel pressure sending unit for some OEM EFI systems that runs on the same 5V power... pretty accurate and used in the newer systems to trim injector pulsewidth for proper emissions calibration. They also have a temperature sensor, so basically they are now calculating BTU content of the fuel by density and adjusting accordingly. A little circuit board work, and you could have a nice accurate gauge (might be something out there already...) Far better than most analog gauges I've seen/tested in the engine bays on most cars. FWIW Great suggestion Tony! I will look into that and report. Quote Link to comment Share on other sites More sharing options...
KevvinG Posted October 22, 2016 Share Posted October 22, 2016 The Mr. Gasket fuel pressure gauge kit off amazon worked well for me on my triple weber conversion. My fuel in line runs from my filter to the firewall, along the firewall to the drivers side then to the rearmost carburetor first and I mounted the gauge with a little home made bracket that bolts up to where the throttle linkage bolts to the firewall. Quote Link to comment Share on other sites More sharing options...
ZHoob2004 Posted October 23, 2016 Share Posted October 23, 2016 The Mr. Gasket fuel pressure gauge kit off amazon worked well for me on my triple weber conversion. My fuel in line runs from my filter to the firewall, along the firewall to the drivers side then to the rearmost carburetor first and I mounted the gauge with a little home made bracket that bolts up to where the throttle linkage bolts to the firewall. Keep in mind that efi and carb systems operate in completely different pressure ranges, so a carb gauge won't work for efi and vise versa Quote Link to comment Share on other sites More sharing options...
dmoralesbello Posted October 23, 2016 Author Share Posted October 23, 2016 Keep in mind that efi and carb systems operate in completely different pressure ranges, so a carb gauge won't work for efi and vise versa Yes indeed. EFI fuel pressure should be around 55psi and the appropriate gauge reads o to 100 psi. Thanks for the heads up. Quote Link to comment Share on other sites More sharing options...
NewZed Posted October 23, 2016 Share Posted October 23, 2016 (edited) I'm planning on installing an inline fuel pressure gauge in the engine compartment of my stock EFI 1978 280Z. Yes indeed. EFI fuel pressure should be around 55psi and the appropriate gauge reads o to 100 psi. Thanks for the heads up. The two red things don't go together. Edited October 23, 2016 by NewZed Quote Link to comment Share on other sites More sharing options...
dmoralesbello Posted October 23, 2016 Author Share Posted October 23, 2016 The two red things don't go together. Absolutely right. Fuel pressure for a stock EFI system in a 280Z should be 36psi at idle. Thank you for the correction. Quote Link to comment Share on other sites More sharing options...
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