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#1 |
![]() Join Date: Sep 2016
Location: Ocala, FL
Posts: 889
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Gentlemen, read my analysis carefully please.
When I got my project running 5 weeks ago the fuel pressure was 50-53 as it should be. Car sat for 5 weeks with fresh fuel and fuel pressures were as following 42 psi one pump 80 psi two pumps. 8.2 amps I replaced the fuel filter which brought it up to 45 psi one pump 85 psi two pumps Upon applying vacuum to the OEM Fuel Pressure Regulator there was no change so I purchased a FPR from Jerry. Nice piece BTW. Pressures are now 51 psi one pump. Perfect. 70 psi two pumps. 80 psi spike for 2 seconds when ignition turned on. FSM says restriction in fuel return. I disconnect the fuel return line at its union parallel to fuel filter. Slip on a rubber hose into a gas can. Retest 51 psi two pumps. Perfect. I have a restriction between union and tank. I carefully inspect the SS fuel line from union to tank looking for damage from a careless jack or rear end collision. All is fine. I remove rubber fuel line line at tank and blow air from each direction. Seems fine. Reconnect union. 70 psi two pumps. I splice a piece of rubber fuel line to rubber return line at tank and put it in a gas can. 70 psi two pumps It flows into the gas can but does not shoot with force as I expected. So problem is between union and end of rubber fuel line at tank. Has the 18 inch piece of 32 year old rubber fuel return line internally collapsed from the fresh fuel? Shall I drop the tank and cut off that hose at its crimp and splice on a new rubber fuel line? Baffled.
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Steve Young 1991 ZR-1 Quasar Blue Metallic/Black #729 Second Owner 1991 ZR-1 Dark Red Metallic/Black #2040 SOLD 1990 ZR-1 Dark Red Metallic/Saddle #1670 SOLD Double your happiness.....complain half as much. |
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#2 |
![]() Join Date: Sep 2016
Location: Ocala, FL
Posts: 889
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SOLVED! I found this in the tank return hose. I hack sawed the hard line at the crimp union. This plastic plug was jammed down the hose. Pressure is normal now. Spliced in 11 inches of 3/8 hose.
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Steve Young 1991 ZR-1 Quasar Blue Metallic/Black #729 Second Owner 1991 ZR-1 Dark Red Metallic/Black #2040 SOLD 1990 ZR-1 Dark Red Metallic/Saddle #1670 SOLD Double your happiness.....complain half as much. |
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#3 |
![]() Join Date: Sep 2016
Location: Ocala, FL
Posts: 889
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__________________
Steve Young 1991 ZR-1 Quasar Blue Metallic/Black #729 Second Owner 1991 ZR-1 Dark Red Metallic/Black #2040 SOLD 1990 ZR-1 Dark Red Metallic/Saddle #1670 SOLD Double your happiness.....complain half as much. |
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#4 | |
![]() Join Date: May 2010
Location: Japan
Posts: 3,572
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Wow! Great troubleshooting! Where the hell is that thing from? Sent from my iPhone using ZR-1 Net Registry
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Craig "ZR-1 NO KA 'OI" "ZR-1 ICHIBAN" 1995 #228 Black/Black with Dunn Heads ZR-1 owner since September 2003 ZR-1 Net Registry Founding Member #0074 NCM Lifetime Member #2048 ![]() |
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#5 |
![]() Join Date: Sep 2016
Location: Ocala, FL
Posts: 889
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I have no idea what the cone shaped thing is. I had to push it out with a rod. It did not not fall out. The pressure must have swollen the hose to allow gas to pass by the plug. Crazy huh.
__________________
Steve Young 1991 ZR-1 Quasar Blue Metallic/Black #729 Second Owner 1991 ZR-1 Dark Red Metallic/Black #2040 SOLD 1990 ZR-1 Dark Red Metallic/Saddle #1670 SOLD Double your happiness.....complain half as much. |
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#6 | |
![]() Join Date: May 2010
Location: Japan
Posts: 3,572
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__________________
Craig "ZR-1 NO KA 'OI" "ZR-1 ICHIBAN" 1995 #228 Black/Black with Dunn Heads ZR-1 owner since September 2003 ZR-1 Net Registry Founding Member #0074 NCM Lifetime Member #2048 ![]() |
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#7 |
![]() Join Date: Feb 2010
Location: Jacksonville,FL
Posts: 240
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Looks like a tip from a caulk tube. Wonder what the PO thought he was doing by plugging the return line. WOW.
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Gary 90-1572 ![]() |
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#8 |
![]() Join Date: Sep 2016
Location: Ocala, FL
Posts: 889
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Maybe PO plugged the line while servicing the pumps. The originals were no longer installed. Forgot to take it out when slipping the hose on the pump assembly.
__________________
Steve Young 1991 ZR-1 Quasar Blue Metallic/Black #729 Second Owner 1991 ZR-1 Dark Red Metallic/Black #2040 SOLD 1990 ZR-1 Dark Red Metallic/Saddle #1670 SOLD Double your happiness.....complain half as much. |
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#9 |
Join Date: Jun 2012
Location: fort worth
Posts: 183
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That's weird! I'm surprised that you discovered it!
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#10 |
![]() Join Date: Sep 2016
Location: Ocala, FL
Posts: 889
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I pushed a wire up the hose and it stopped at the hose crimp. So I cut that sucker off!
__________________
Steve Young 1991 ZR-1 Quasar Blue Metallic/Black #729 Second Owner 1991 ZR-1 Dark Red Metallic/Black #2040 SOLD 1990 ZR-1 Dark Red Metallic/Saddle #1670 SOLD Double your happiness.....complain half as much. |
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