High fuel pressure

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Tractorman

Junior Member
Joined
Sep 3, 2023
Posts
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Location
New Jersey
First Name
David
Truck Year
1985
Truck Model
C30 Crewcab
Engine Size
7.4l
Hi, hoping someone can help have 1985 chev c30 with 7.4l. Runs fine all day at idle or stationary at high rpm.
As soon as I take it out on the road it will start to starve for fuel and almost die unless I feather the accelerator.
When going to remove the fuel line I noticed there was high pressure and although I didn't time I would guess it was under pressure for at least 30 seconds. Can someone explain this as I have never seen this before. This was also after the vehicle had been sitting for at least 15 minutes. Any ideas on the fuel starvation problem. Does on flat surface as well as hills.
Also have replaced distributor as I have seen issues with the wiring to pickup coil.
Thanks for any ideas.
 

fast 99

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Dec 31, 2021
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Location
Spokane, Washington
First Name
Brian
Truck Year
81,85
Truck Model
K20
Engine Size
350
Assume pressure was at carb or that line?
If so it isn't unusual for some pressure to be there. Sounds like a fuel volume issue. Check fuel pump pressure and volume. Likely a bad pump or fuel filter.
 

nvrenuf

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Joined
Jul 30, 2010
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Location
Mobile, Al.
First Name
John
Truck Year
1991
Truck Model
K5
Engine Size
454
Put a pressure gauge between the pump and carb to KNOW that’s the problem. Parts places have fuel pressure test kits in their loaner tool stuff.
 

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