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## Re: [TR] What is the correct way to measure fuel pressure

 To: "'Sujit Roy'" , "'Triumphs'" Re: [TR] What is the correct way to measure fuel pressure "Randall" Mon, 21 Oct 2019 14:12:04 -0700 mharc@autox.team.net triumphs@autox.team.net AdWIP0bVY8npJjjjTeiM+y25bwJZPQAEgieQ DGBHn8gFDmXx4VbvM8VagaPtneiGuLbFuM9sso7JOj3QBB+sxZAcubCnfST2T7AHoJPDYI4NYWzbU33w5D8duMlkoKR3v44aLzw=
 ```Don't forget to account for the difference in height between the pump and carbs. The spec in my book is 2.7 psi measured at the pump; and if I've done my math right, each 3.75" rise will reduce that by 0.1 psi. So assuming the carbs are about 2' above the fuel pump, you should see closer to 2 psi at the carb inlets. But I don't trust measuring tools from HF, especially used ones. Check it with another gauge; or if you don't have one, build a simple manometer. A 6' length of pipe or tubing could make a simple "go/no-go" gauge; hold it vertically and if the pump can push fuel out the top, you've got enough fuel pressure. Or for temporary use, some cheap vinyl tubing from Home Depot tied to a piece of wood will let you read the height. Vinyl isn't rated for fuel of course, but should do for a quick test. (Don't use it for anything else afterwards, though.) 37.4" should equal 1 psi of gasoline (using numbers I got from Google). Not at all relevant, but the book also calls the pump "high pressure", which I find amusing. -- Randall 56 TR3 TS13571L once and future daily driver 71 Stag LE1473 - awaiting engine rebuild 71-2-3 Stag - awaiting gearbox rebuild > I borrowed a Harbor Freight fuel pressure gauge from a fellow > Triumph owner. I disconnected the supply to the ZS carbs and > connected the pressure gauge directly to the feed. > The gauge read less than 1 PSIG. I have a Stag and it is > using an SU electric fuel pump.The stag pump should be around 3 psi. > Am I measuring the pump correctly? Should I Tee in the gauge > inline with the carbs instead? ** triumphs@autox.team.net ** Archive: http://www.team.net/pipermail/triumphs http://www.team.net/archive ```
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