8V92 Low Fuel Pressure - Printable Version +- Wanderlodge Gurus - The Member Funded Wanderlodge Forum (http://www.wanderlodgegurus.com) +-- Forum: Yahoo Groups Archive (/forumdisplay.php?fid=61) +--- Forum: WanderlodgeForum (/forumdisplay.php?fid=63) +--- Thread: 8V92 Low Fuel Pressure (/showthread.php?tid=4478)

8V92 Low Fuel Pressure - Curt Sprenger - 03-11-2007 04:31 I changed seven fuel lines...4 at the heads, Racor to fuel pump, fuel pump to filter inlet, return manifold to hard return line. After priming/starting the 8V92...Fuel Pressure readings were 8 at idle, 45 at 2150 rpms. Ran the engine for a few minutes. Fuel pressure now 2 at idle, 30 at 2150 rpms. The manual says 20 to 30 at idle, 50 to 70 at 2150 rpms. A new fuel pump was installed. Same low pressures as above. Removed the pressure relief plug, gasket, pin, spring, relief valve, from the *old* pump. All looks good, nothing stuck. My error, I did not take fuel pressure readings before the hose change, problem could have been there before. Thoughts? -- Curt Sprenger 1987 PT38 8V92 "MacAttack Racing" Anaheim Hills, Calif. 8V92 Low Fuel Pressure - davidkerryedwards - 03-11-2007 06:43 I know Mercedes diesels can get dirty screens in the fuel tank. Don't know if this could happen in your case. Have you checked the flow out of the tank? Kerry 82 FC 35 Denver --- In WanderlodgeForum@yahoogroups.com, Curt Sprenger wrote: > > I changed seven fuel lines...4 at the heads, Racor to fuel pump, fuel > pump to filter inlet, return manifold to hard return line. > > After priming/starting the 8V92...Fuel Pressure readings were 8 at idle, > 45 at 2150 rpms. Ran the engine for a few minutes. Fuel pressure now 2 > at idle, 30 at 2150 rpms. The manual says 20 to 30 at idle, 50 to 70 at > 2150 rpms. > > A new fuel pump was installed. Same low pressures as above. > > Removed the pressure relief plug, gasket, pin, spring, relief valve, > from the *old* pump. All looks good, nothing stuck. > > My error, I did not take fuel pressure readings before the hose change, > problem could have been there before. > > Thoughts? > > -- > Curt Sprenger > 1987 PT38 8V92 "MacAttack Racing" > Anaheim Hills, Calif. > 8V92 Low Fuel Pressure - tjholtermann - 03-11-2007 07:07 Curt, Reply off line, at tjholtermann@.... I need to ask you some questions, I think I help you with your problem. Tony Holtermann 88wb38 San Marcos, Tx. --- In WanderlodgeForum@yahoogroups.com, Curt Sprenger wrote: > > I changed seven fuel lines...4 at the heads, Racor to fuel pump, fuel > pump to filter inlet, return manifold to hard return line. > > After priming/starting the 8V92...Fuel Pressure readings were 8 at idle, > 45 at 2150 rpms. Ran the engine for a few minutes. Fuel pressure now 2 > at idle, 30 at 2150 rpms. The manual says 20 to 30 at idle, 50 to 70 at > 2150 rpms. > > A new fuel pump was installed. Same low pressures as above. > > Removed the pressure relief plug, gasket, pin, spring, relief valve, > from the *old* pump. All looks good, nothing stuck. > > My error, I did not take fuel pressure readings before the hose change, > problem could have been there before. > > Thoughts? > > -- > Curt Sprenger > 1987 PT38 8V92 "MacAttack Racing" > Anaheim Hills, Calif. > 8V92 Low Fuel Pressure - davidkerryedwards - 03-11-2007 07:59 I should have added that you can test the tank by simply taking a gallon container of diesel and putting your suction and return lines into it and try running the engine off the container. It would exclude any problems upstream of your attachment point to the tank. Kerry 82 FC 35 Denver --- In WanderlodgeForum@yahoogroups.com, "davidkerryedwards" wrote: > > I know Mercedes diesels can get dirty screens in the fuel tank. Don't know if this could > happen in your case. Have you checked the flow out of the tank? > > Kerry > 82 FC 35 > Denver 8V92 Low Fuel Pressure - Troy Tikalsky - 03-12-2007 06:57 Have you verified the gauge is reading correctly? Troy ----- Original Message ----- From: Curt Sprenger To: WanderlodgeForum@yahoogroups.com ; wanderlodge@yahoogroups.com Sent: Sunday, March 11, 2007 10:31 AM Subject: [WanderlodgeForum] 8V92 Low Fuel Pressure I changed seven fuel lines...4 at the heads, Racor to fuel pump, fuel pump to filter inlet, return manifold to hard return line. After priming/starting the 8V92...Fuel Pressure readings were 8 at idle, 45 at 2150 rpms. Ran the engine for a few minutes. Fuel pressure now 2 at idle, 30 at 2150 rpms. The manual says 20 to 30 at idle, 50 to 70 at 2150 rpms. A new fuel pump was installed. Same low pressures as above. Removed the pressure relief plug, gasket, pin, spring, relief valve, from the *old* pump. All looks good, nothing stuck. My error, I did not take fuel pressure readings before the hose change, problem could have been there before. Thoughts? -- Curt Sprenger 1987 PT38 8V92 "MacAttack Racing" Anaheim Hills, Calif. [Non-text portions of this message have been removed] 8V92 Low Fuel Pressure - Curt Sprenger - 03-12-2007 12:19 Yes. Curt Sprenger 1987 PT38 8V92 "MacAttack Racing" Anaheim Hills, Calif. Troy Tikalsky wrote: > Have you verified the gauge is reading correctly? > > Troy > > ----- Original Message ----- > From: Curt Sprenger > To: WanderlodgeForum@yahoogroups.com > ; > wanderlodge@yahoogroups.com > Sent: Sunday, March 11, 2007 10:31 AM > Subject: [WanderlodgeForum] 8V92 Low Fuel Pressure > > I changed seven fuel lines...4 at the heads, Racor to fuel pump, fuel > pump to filter inlet, return manifold to hard return line. > > After priming/starting the 8V92...Fuel Pressure readings were 8 at idle, > 45 at 2150 rpms. Ran the engine for a few minutes. Fuel pressure now 2 > at idle, 30 at 2150 rpms. The manual says 20 to 30 at idle, 50 to 70 at > 2150 rpms. > > A new fuel pump was installed. Same low pressures as above. > > Removed the pressure relief plug, gasket, pin, spring, relief valve, > from the *old* pump. All looks good, nothing stuck. > > My error, I did not take fuel pressure readings before the hose change, > problem could have been there before. > > Thoughts? > > -- > Curt Sprenger > 1987 PT38 8V92 "MacAttack Racing" > Anaheim Hills, Calif. > > [Non-text portions of this message have been removed] > > 8V92 Low Fuel Pressure - putneyflash@...> - 03-12-2007 14:22 See if there is a check valvein the line if so it may need to be cleaned re brake 1983 fc-35 > > From: "tjholtermann" > Date: 2007/03/11 Sun PM 01:07:45 EST > To: WanderlodgeForum@yahoogroups.com > Subject: [WanderlodgeForum] Re: 8V92 Low Fuel Pressure > > Curt, > > Reply off line, at tjholtermann@.... I need to ask you some > questions, I think I help you with your problem. > > Tony Holtermann > 88wb38 San Marcos, Tx. > > --- In WanderlodgeForum@yahoogroups.com, Curt Sprenger > wrote: > > > > I changed seven fuel lines...4 at the heads, Racor to fuel pump, > fuel > > pump to filter inlet, return manifold to hard return line. > > > > After priming/starting the 8V92...Fuel Pressure readings were 8 at > idle, > > 45 at 2150 rpms. Ran the engine for a few minutes. Fuel pressure > now 2 > > at idle, 30 at 2150 rpms. The manual says 20 to 30 at idle, 50 to > 70 at > > 2150 rpms. > > > > A new fuel pump was installed. Same low pressures as above. > > > > Removed the pressure relief plug, gasket, pin, spring, relief > valve, > > from the *old* pump. All looks good, nothing stuck. > > > > My error, I did not take fuel pressure readings before the hose > change, > > problem could have been there before. > > > > Thoughts? > > > > -- > > Curt Sprenger > > 1987 PT38 8V92 "MacAttack Racing" > > Anaheim Hills, Calif. > > > > > >