MORE fuel system problems!
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MORE fuel system problems!
I bought a 392 Walbro kit, from vulcan performance. At first I had 15psi at idle, and I could suck down to 7-8psi.
This morning I cranked the truck, and it was idleing at 6psi. I changed the inline pre-filter, and the filter in the housing. Same thing.
I cranked up the regulator. Now I have 18-20psi at idle, but I can still suck it down to 8psi.
I pulled the line off from the tank and blew it it (with the filler cap off), and I could BARELY get any air through. I guess my pick up tube's screen is clogged?
Im tempted to go trade it in for a Ford.
This morning I cranked the truck, and it was idleing at 6psi. I changed the inline pre-filter, and the filter in the housing. Same thing.
I cranked up the regulator. Now I have 18-20psi at idle, but I can still suck it down to 8psi.
I pulled the line off from the tank and blew it it (with the filler cap off), and I could BARELY get any air through. I guess my pick up tube's screen is clogged?
Im tempted to go trade it in for a Ford.
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Joined: Nov 2003
Posts: 410
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From: Chattanooga, TN
Could be that your pickup tube sucked up some crud. I blew about 20psi back up my fuel line into the tank (cap off) and it blew bubbles in the tank - I could hear it. Seemed to help a bit. Also replaced the pre-filter like you did, nothing in the filter when I cut it open and it still acted funny. I will be changing my power supply to the Walbro from the existing lift-pump wires to a relay setup activated by the lift-pump wires and hope that helps.
There is another thread going on where a guy called GDP and they suggested replacing the bypass valve on the VP44. I'm watching this one closely myself.
https://www.dieseltruckresource.com/...d.php?t=134255
But my symptoms are not exactly like yours. I have great pressure most of the time. Even under hard acceleration, it only pulls down a lb or two max. What I have is it will sometimes act like a stinkin' old Carter. It will idle at 13 and drop to 3. Be like this a day or two, then be good again for many days. It seems it would act the funniest on longer drives. But not sure of that theory yet.
There is another thread going on where a guy called GDP and they suggested replacing the bypass valve on the VP44. I'm watching this one closely myself.
https://www.dieseltruckresource.com/...d.php?t=134255
But my symptoms are not exactly like yours. I have great pressure most of the time. Even under hard acceleration, it only pulls down a lb or two max. What I have is it will sometimes act like a stinkin' old Carter. It will idle at 13 and drop to 3. Be like this a day or two, then be good again for many days. It seems it would act the funniest on longer drives. But not sure of that theory yet.
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Joined: Oct 2006
Posts: 18
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From: Haddonfield, NJ
I am having a very similar problem as well. I have a thread going about it too.
https://www.dieseltruckresource.com/...d.php?t=132302
My pressure gets so bad after the truck starts that that truck shuts off in like 15sec. I have dropped my tank and cleaned the prefilter too. I flow tested my pump and it only flowed about 60-70% of what it should be. I am currently awaiting a new pump from Glacier Diesel. Hopefully this will solve the problem. It has been 3 weeks since i drove my truck.
I will keep you posted on my findings.
https://www.dieseltruckresource.com/...d.php?t=132302
My pressure gets so bad after the truck starts that that truck shuts off in like 15sec. I have dropped my tank and cleaned the prefilter too. I flow tested my pump and it only flowed about 60-70% of what it should be. I am currently awaiting a new pump from Glacier Diesel. Hopefully this will solve the problem. It has been 3 weeks since i drove my truck.
I will keep you posted on my findings.
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