 FI Challenged Individual Checking Fuel Pressure, and a question re: fuel pressure regulator |
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| 76-914 |
 Mar 23 2009, 10:56 PM
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#1
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Repeat Offender & Resident Subaru Antagonist  Group: Members Posts: 13,876 Joined: 23-January 09 From: Temecula, CA Member No.: 9,964 Region Association: Southern California 
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Trying to teach myself about FI. Bear with me! Does it matter where you check the fuel pump pressure i.e. before or after the pressure regulator? Secondly tell me if I got this right: 76 2.0 GC series engine; Fuel leaves the tank, flows thru fuel filter to pump where it is pumped to the passenger side fuel rail the over to the drivers side fuel rail. One branch on this fuel rail feeds the cold start valve while the other branch goes to the pressure regulator. If pressure exceeds appx 35psi then excess is bled off and routed back to the tank outlet/pump inlet junction??? Is this how it works???? Thirdly, does Pelican rent a gage? I took a water pressure gage (0-60lb) and checked pressure on outlet side of PRV. It pegged the gage so I'm thinking wrong gage/wrong side of PRV or pump is on steriods. Can ya hep me?
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| SLITS |
Mar 24 2009, 06:56 AM
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"This Utah shit is HARSH!" Group: Benefactors Posts: 13,602 Joined: 22-February 04 From: SoCal Mountains ... Member No.: 1,696 Region Association: None  |
Tank .... fuel filter ..... pump .... passenger side rail ... across engine ... driver side rail (cold start valve tees off here) .... pressure regulator .... back across engine to tank return line.
Pressure should be measured at tap for cold start valve (after pump before pressure regulator). Pressure should be 29.4 lbs. At 35 lbs you might be over-riding the closure spring in the injector and causing it to leak fuel. |
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| type47 |
Mar 24 2009, 07:21 AM
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#3
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Viermeister Group: Members Posts: 4,254 Joined: 7-August 03 From: Vienna, VA Member No.: 994 Region Association: MidAtlantic Region |
QUOTE(SLITS @ Mar 24 2009, 05:56 AM)  Pressure should be measured at tap for cold start valve (after pump before pressure regulator). The fuel pump should supply more than the desired pressure for the system so I would guess you measured at the wrong place; the regulator adjusts for the right pressure. Look for the tap mentioned above. |
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Posts in this topic
76-914 FI Challenged Individual Checking Fuel Pressure Mar 23 2009, 10:56 PM
Bleyseng or if its pegged it could be a pinched return hose... Mar 24 2009, 08:08 AM SLITS Sorry I didn't fully read the post .... You sa... Mar 24 2009, 10:53 AM underthetire If you are new to FI, i suggest you read all of th... Mar 24 2009, 11:19 AM McMark :agree: Check fuel pressure at the CSV port.
If f... Mar 24 2009, 01:03 PM
76-914
:agree: Check fuel pressure at the CSV port.
If ... Mar 24 2009, 10:43 PM 76-914 Hot Damn this is some good information. Dead head ... Mar 24 2009, 10:21 PM McMark
That's a good way to get it right. But getti... Mar 25 2009, 11:22 AM 76-914
That's a good way to get it right. But gett... Mar 25 2009, 03:29 PM 76-914 :headbang: OK. Retested at "test port" a... Mar 25 2009, 03:25 PM |
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