I need some fuel system help!!!
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Freshman User
Joined: Jun 2008
Posts: 31
Likes: 1
From: Florida
I need some fuel system help!!!
Well, here's the deal...
Im running the stock fuel tank, with a welded in sump that the feed line comes from. Im using a Holley Blue for a fuel pump, and Its slightly lower than the tank (mounted on the frame rail, dont know how to go any lower than that...) I get a very erratic fuel pressure. I have a return line running from the regulator back to the original feed in the stock location.
I dont know whats causing my erratic fuel pressure, basically. One minute it will be running at 6psi, and the next it will be down at 2psi or up to 12psi. The regulator makes a very funny noise when the pressure starts jumping around, almost like air is getting in the lines, but everything is tight and I just dont see how air could be getting in the lines. And its wierd, because sometimes the pressure will sit on 6psi just as steady as a rock... and at random it will start acting up.
For an engine, im running a 306 with a speed demon carb...
If anyone has any ideas or suggestions, please offer them. Im pulling my hair out, and starting to regret buying this truck.
Im running the stock fuel tank, with a welded in sump that the feed line comes from. Im using a Holley Blue for a fuel pump, and Its slightly lower than the tank (mounted on the frame rail, dont know how to go any lower than that...) I get a very erratic fuel pressure. I have a return line running from the regulator back to the original feed in the stock location.
I dont know whats causing my erratic fuel pressure, basically. One minute it will be running at 6psi, and the next it will be down at 2psi or up to 12psi. The regulator makes a very funny noise when the pressure starts jumping around, almost like air is getting in the lines, but everything is tight and I just dont see how air could be getting in the lines. And its wierd, because sometimes the pressure will sit on 6psi just as steady as a rock... and at random it will start acting up.
For an engine, im running a 306 with a speed demon carb...
If anyone has any ideas or suggestions, please offer them. Im pulling my hair out, and starting to regret buying this truck.
Senior User
Joined: Apr 2008
Posts: 210
Likes: 0
From: South west Wisconsin
First I would check your fuel lines for any obstructions, or collapse. Next, check your regulator and make sure it is not malfunctioning. A bad spring in a regulator can drive you nuts! The next thing I would do is to put a pressure guage directly on the fuel pump, and return the fuel directly to the tank, instead of the carb. to get an accurate read on the pump output. In other words, single out the pump, and the regulator, and check the pressure with a constant flow, as well as a restricted flow and see if the pump may be having an issue. If you have no restrictions between the tank and the carb, the problem almost has to be in the pump, regulator, or both. I have had electric pumps right out of the box that have failed with in the first 10 mins of use, or have given erratic supply pressures.
Dont pull your hair out just yet, you will find it! LOL
Dont pull your hair out just yet, you will find it! LOL
