Walboro ( SuperDuty ) Pump installed !!!!
#48
"It's part of the banjo bolt where the return line leaves the VP."
It is referring to the relief valve on the VP44.
Could someone pull this from their VP44 and post some pictures of it.
It would be really neat to mod that valve and have all the fuel go through the VP44 at a reasonable pressure and not have any bypass plumbing at all.
I was thinking of doing the same thing with the cascade overflow valve on the CP3, but the internal pump pressures in a CP3 are used to control fuel delivery with the FCA, so I decided not to touch it.
On the VP44 fuel delivery is controlled by plunger stroke, so modding that valve is probably a thing that could be done.
If the pictures look reasonable, maybe I will buy one and have a closer look at modding them.
In the mean time, fuel flows and testing the 1/2" Swagelok seem worthwhile activities, to me anyway.
Does anyone see a problem with pushing 80 GPH through the VP44 at 15ish PSI ?
I think it would be well lubed and well cooled !
It is referring to the relief valve on the VP44.
Could someone pull this from their VP44 and post some pictures of it.
It would be really neat to mod that valve and have all the fuel go through the VP44 at a reasonable pressure and not have any bypass plumbing at all.
I was thinking of doing the same thing with the cascade overflow valve on the CP3, but the internal pump pressures in a CP3 are used to control fuel delivery with the FCA, so I decided not to touch it.
On the VP44 fuel delivery is controlled by plunger stroke, so modding that valve is probably a thing that could be done.
If the pictures look reasonable, maybe I will buy one and have a closer look at modding them.
In the mean time, fuel flows and testing the 1/2" Swagelok seem worthwhile activities, to me anyway.
Does anyone see a problem with pushing 80 GPH through the VP44 at 15ish PSI ?
I think it would be well lubed and well cooled !
#49
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Join Date: Oct 2003
Location: NE Pa.
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Originally Posted by 043500QC
Our valve is in the bypass line right now.
We were under the same assumption you are about the pressure remaining constant, but it seems the high restriction of either the 1/4" Swagelok valve or the return lines is cause our pressure to stay too high.
We were shooting for a constant 15psi at the VP.
We were under the same assumption you are about the pressure remaining constant, but it seems the high restriction of either the 1/4" Swagelok valve or the return lines is cause our pressure to stay too high.
We were shooting for a constant 15psi at the VP.
#50
Originally Posted by turbo51015
Whats the psi. if you remove the Swagelok valve all together? Just run a bypass.
#51
Originally Posted by Geico266
The return line measures .312 OD, that = 5/16 outside diameter, not the diameter of the hole. If the wall thickness is 1/32 then it is 1/4" ID.
Which line is that, the metal, or plastic one ? I`m not arguing, just curious as to which one you`re referring too.
#52
Registered User
Originally Posted by 043500QC
Which line is that, the metal, or plastic one ? I`m not arguing, just curious as to which one you`re referring too.
#53
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Originally Posted by 043500QC
Don`t know, we thought about trying that also, but kinda backed out of doing it in fear of over pressuring the fuel filter lid/canister.
#54
"Don`t know, we thought about trying that also, but kinda backed out of doing it in fear of over pressuring the fuel filter lid/canister."
I think he meant just put a line between the VP44 inlet and the return line and feed the VP44 with a few PSI. With no regulator at all. Like I am doing with the CP3.
Conversely, why not just remove the bypass altogether and disassemble or remove the VP44 relief valve and then run all the Walbro fuel through the VP44 at whatever pressure it generates. It will be well cooled and well lubed. I can't see it starving with 80-85 GPH running right through it.
Would the fuel run through the VP44 if it wasn't turning ?
I suspect the VP44 relief valve is designed to keep fuel in the pump rather than draining out the return line in the case of there not being enough fuel going to it.
You might also be able to get rid of the bypass, remove the VP44 relief valve and just put the 1/2" Swagelok in the return line right after the VP44. Essentially that would replace the stock VP44 relief valve with the 1/2 Swagelok doing the same function. It should have enough flow capacity to keep the pressure in the VP44 right where you set it, plus you'll have 80 GPH going through the VP44.
I really like this idea.
I think he meant just put a line between the VP44 inlet and the return line and feed the VP44 with a few PSI. With no regulator at all. Like I am doing with the CP3.
Conversely, why not just remove the bypass altogether and disassemble or remove the VP44 relief valve and then run all the Walbro fuel through the VP44 at whatever pressure it generates. It will be well cooled and well lubed. I can't see it starving with 80-85 GPH running right through it.
Would the fuel run through the VP44 if it wasn't turning ?
I suspect the VP44 relief valve is designed to keep fuel in the pump rather than draining out the return line in the case of there not being enough fuel going to it.
You might also be able to get rid of the bypass, remove the VP44 relief valve and just put the 1/2" Swagelok in the return line right after the VP44. Essentially that would replace the stock VP44 relief valve with the 1/2 Swagelok doing the same function. It should have enough flow capacity to keep the pressure in the VP44 right where you set it, plus you'll have 80 GPH going through the VP44.
I really like this idea.
#55
"What psi would you see?"
I think he would see 4 PSI at WOT, a bit more at idle. I don't know if I like that because it doesn't force fuel through the VP44. The idea is to get fuel moving through the VP44 so it gets lubed and cooled. On the CP3, its lift pump makes sure that happens. On the VP44 the Walbro has to push fuel through the pump and there needs to be a pressure differential between inlet and return line for that to happen.
I'd be more inclined to remove the bypass, remove the VP44 relief and push all the Walbro fuel through the VP44.
But it is YOUR truck, not mine.
I think he would see 4 PSI at WOT, a bit more at idle. I don't know if I like that because it doesn't force fuel through the VP44. The idea is to get fuel moving through the VP44 so it gets lubed and cooled. On the CP3, its lift pump makes sure that happens. On the VP44 the Walbro has to push fuel through the pump and there needs to be a pressure differential between inlet and return line for that to happen.
I'd be more inclined to remove the bypass, remove the VP44 relief and push all the Walbro fuel through the VP44.
But it is YOUR truck, not mine.
#56
Originally Posted by Superduty
I think he meant just put a line between the VP44 inlet and the return line and feed the VP44 with a few PSI. With no regulator at all. Like I am doing with the CP3.
Originally Posted by Superduty
Conversely, why not just remove the bypass altogether and disassemble or remove the VP44 relief valve and then run all the Walbro fuel through the VP44 at whatever pressure it generates. It will be well cooled and well lubed. I can't see it starving with 80-85 GPH running right through it.
Originally Posted by Superduty
Would the fuel run through the VP44 if it wasn't turning ?
Originally Posted by Superduty
I suspect the VP44 relief valve is designed to keep fuel in the pump rather than draining out the return line in the case of there not being enough fuel going to it.
Originally Posted by Superduty
You might also be able to get rid of the bypass, remove the VP44 relief valve and just put the 1/2" Swagelok in the return line right after the VP44. Essentially that would replace the stock VP44 relief valve with the 1/2 Swagelok doing the same function. It should have enough flow capacity to keep the pressure in the VP44 right where you set it, plus you'll have 80 GPH going through the VP44.
I really like this idea.
I really like this idea.
Hey dad, jump in here anytime.
#57
I totally understand your position about not wanting to experiment on your VP. No pressure from me to anything you don't want to do.
If you think about it, the stock VP flows all the fuel that the stock lift pump gives it. Removing the stock VP relief valve and using the Walbro would be doing the same thing. Except it would be fed by a firehose instead of a straw.
If you think about it, the stock VP flows all the fuel that the stock lift pump gives it. Removing the stock VP relief valve and using the Walbro would be doing the same thing. Except it would be fed by a firehose instead of a straw.
#58
I'll have to say that i am impressed with the cooperation and the imput from people trying to figure this out. I have the exact same issues with the holley regulator that he is having with the swagelock. I think the pump is over powering the regulatoe and dumping all the fuel to return. I am in the middle of home remodel stuff and my truck tinker time is limited. I too have wondered what would happen if you ran the pump with no regulator, i'm a bit scared to try i'll admit. Let's try like hell to get this figured out , there are tons of people who can benefit from the outcome. Thanks to all that are helping.
Stevo
Stevo
#59
Registered User
I'm not trying to start a war, rain on anyone's parade, continue a battle, or give the mods a headacke, but, I think at this point someone has to ask, is the Walbro the right pump for this application? Seems to me there should be a pump that has the ability to regulate the flow / PSI to what the application needs and more importantly what it was designed for.
I have gotten 185K miles on my original VP-44 by CAREFULLY monitoring fuel pressure of the stock set up.
BTW SD good luck with the baby.
I have gotten 185K miles on my original VP-44 by CAREFULLY monitoring fuel pressure of the stock set up.
BTW SD good luck with the baby.
#60
Before I would run the bypass without the regulator, I would remove the VP44 regulator and run all the fuel through it. The idea is to move the fuel THROUGH the VP44. (Capitals were emphasis, not shouting...) I don't think the VP44 will suck fuel like the CP3 will.
It is great to be working with people instead of fighting against them.
Isn't it ironic that we are fighting too much pressure versus not enough of it ?
It is great to be working with people instead of fighting against them.
Isn't it ironic that we are fighting too much pressure versus not enough of it ?