Fuel Pressure Problem - ZR-1 Net Registry Forums

sgentilella · 03-20-2024

I am not getting enough fuel pressure for the car to drive. It will idle, but any throttle results in the engine breaking up. In checking the various possibilities, I found that I have no power to the fuse for the second fuel pump. Does any one know a source for a complete wiring diagram for the relays, the fuses and fuse blocks and the pumps?

Thank you,

Jagdpanzer · 03-20-2024

Book 2 of the Factory Service Manual set has the diagram you at looking for. If you don't have them for your particular year look on eBay.

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Jagdpanzer · 03-20-2024

Second fuel only come on during startup and when the ECM calls for it during hard acceleration. Otherwise the main fuel pump supplies all the fuel engine requires.
How much fuel pressure do you have?

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sgentilella · 03-22-2024

Phil

Thanks for the help. Found the wiring diagram and traced the problem to the fuel pumps.
Do you know any source for the internal hoses and the fuel block? Mine are not bad but would like to replace them while everything is apart.

Again, thanks for the help

aafc · 3 Weeks Ago

Check with local auto parts stores. Gates hose 5/16 x 1 ft. # 27093. And
Gates hose 3/8 x 1 ft # 27037.
Also check with Carter for a billet fuel block.

John
1990 White/ Black # 2546
one of a few 4l8OE eq ZR-1's

Starman · 3 Weeks Ago

Be sure you get high pressure, submersible fuel line. The wrong stuff will melt in your tank. Might soak a piece in a jar to be sure.

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aafc · 3 Weeks Ago

Sorry,
If you check with Gates it shows submersible fuel line. I should have said
that on my last post.
John

Young1 · 3 Weeks Ago

And one ft of hose can set you back 30 bucks. It is available on Amazon. Get high pressure clamps too. Not the low pressure screw on the side type.

03-20-2024	#1
sgentilella Join Date: Jul 2018 Location: New Jersey Posts: 10	Fuel Pressure Problem I am not getting enough fuel pressure for the car to drive. It will idle, but any throttle results in the engine breaking up. In checking the various possibilities, I found that I have no power to the fuse for the second fuel pump. Does any one know a source for a complete wiring diagram for the relays, the fuses and fuse blocks and the pumps? Thank you,

03-20-2024	#2
Jagdpanzer Join Date: Apr 2007 Location: Northern VA Posts: 2,644	Re: Fuel Pressure Problem Book 2 of the Factory Service Manual set has the diagram you at looking for. If you don't have them for your particular year look on eBay. Sent from my iPhone using ZR-1 Net Registry __________________ Phil Wasinger 1994 Torch Red ZR-1 WAZOO Member George Braml Intake

03-20-2024	#3
Jagdpanzer Join Date: Apr 2007 Location: Northern VA Posts: 2,644	Re: Fuel Pressure Problem Second fuel only come on during startup and when the ECM calls for it during hard acceleration. Otherwise the main fuel pump supplies all the fuel engine requires. How much fuel pressure do you have? Sent from my iPhone using ZR-1 Net Registry __________________ Phil Wasinger 1994 Torch Red ZR-1 WAZOO Member George Braml Intake

03-22-2024	#4
sgentilella Join Date: Jul 2018 Location: New Jersey Posts: 10	Re: Fuel Pressure Problem Phil Thanks for the help. Found the wiring diagram and traced the problem to the fuel pumps. Do you know any source for the internal hoses and the fuel block? Mine are not bad but would like to replace them while everything is apart. Again, thanks for the help

3 Weeks Ago	#5
aafc Join Date: Feb 2010 Location: Ochlocknee, GA Posts: 424	Re: Fuel Pressure Problem Check with local auto parts stores. Gates hose 5/16 x 1 ft. # 27093. And Gates hose 3/8 x 1 ft # 27037. Also check with Carter for a billet fuel block. John 1990 White/ Black # 2546 one of a few 4l8OE eq ZR-1's Last edited by aafc; 3 Weeks Ago at 11:50 AM.

3 Weeks Ago	#6
Starman Join Date: Sep 2008 Location: Speedway, IN Posts: 118	Re: Fuel Pressure Problem Be sure you get high pressure, submersible fuel line. The wrong stuff will melt in your tank. Might soak a piece in a jar to be sure. Sent from my iPhone using ZR-1 Net Registry

3 Weeks Ago	#7
aafc Join Date: Feb 2010 Location: Ochlocknee, GA Posts: 424	Re: Fuel Pressure Problem Sorry, If you check with Gates it shows submersible fuel line. I should have said that on my last post. John

3 Weeks Ago	#8
Young1 Join Date: Sep 2016 Location: Ocala, FL Posts: 869	Re: Fuel Pressure Problem And one ft of hose can set you back 30 bucks. It is available on Amazon. Get high pressure clamps too. Not the low pressure screw on the side type. __________________ 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.