Myopicmusician
Junior Member
- Joined
- Jul 9, 2016
- Posts
- 2
- Reaction score
- 0
- Location
- Little Rock AR
- First Name
- Michael
- Truck Year
- 1986
- Truck Model
- Sierra
- Engine Size
- 350
After much searching and googling I couldn't find the answer so I'm asking for help.
Just bought a 1986 with dual tanks. Previous owner had an electric fuel pump (Holley type with bypass) installed after tanks and pressure regulator under the hood (1 in and 2 outs). There is an inline pressure gauge by the edelbrock 600.
The gauge reads 11 lbs which I know is way too high but adjusting the pressure reg had no effect on raising or lowering. The truck was hard to start as you would imagine but didn't smoke and ran like an ape when warm.
Tracing the fuel lines back from the regulator, I realized that the PO had the fuel line from pump running to one of the out ports on the regulator and the other out port to the carb. I'm not sure what line was running to the in of the reg, tracing back it just goes to the tank.
After moving the fuel line from pump to the in of reg and plugging one out and the other to the carb, the reg works and I can dial in 5.5 lbs. the unknown line I capped.
Engine fired right off but is smoking horribly from the exhaust. I noticed that it was quickly overheating. I tried adjusting the air fuel at the carb but did not help. Tried uncapping the unknown line running back to the tank and did not help. No fuel comes out of this line either.
What gives? Any thoughts as to what this line is? Vent? Return?
I thought it would run better this way but I'm thinking of going back to the POs setup. Overflowing the carb and horrible gas mileage but it was driveable.
Help!
Just bought a 1986 with dual tanks. Previous owner had an electric fuel pump (Holley type with bypass) installed after tanks and pressure regulator under the hood (1 in and 2 outs). There is an inline pressure gauge by the edelbrock 600.
The gauge reads 11 lbs which I know is way too high but adjusting the pressure reg had no effect on raising or lowering. The truck was hard to start as you would imagine but didn't smoke and ran like an ape when warm.
Tracing the fuel lines back from the regulator, I realized that the PO had the fuel line from pump running to one of the out ports on the regulator and the other out port to the carb. I'm not sure what line was running to the in of the reg, tracing back it just goes to the tank.
After moving the fuel line from pump to the in of reg and plugging one out and the other to the carb, the reg works and I can dial in 5.5 lbs. the unknown line I capped.
Engine fired right off but is smoking horribly from the exhaust. I noticed that it was quickly overheating. I tried adjusting the air fuel at the carb but did not help. Tried uncapping the unknown line running back to the tank and did not help. No fuel comes out of this line either.
What gives? Any thoughts as to what this line is? Vent? Return?
I thought it would run better this way but I'm thinking of going back to the POs setup. Overflowing the carb and horrible gas mileage but it was driveable.
Help!
