View Poll Results: Has your walbro been reliable after the bypass mod
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How many have modified their walbro (bypass mod), is it still running?
Apr 8, 2009, 09:59 AM
#1
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How many have modified their walbro (bypass mod), is it still running?
Just trying to gauge the reliability of a walbro who's bypass has been modified:
http://www.driven2modify.com/showthread.php?t=11702
I know it's been posted before HOW to do this, but I'm wondering how many people are running these and how reliable they are a year or two later.
Has your pump been running perfect? Has anyone had a failure they think is directly related to this modification?
http://www.driven2modify.com/showthread.php?t=11702
I know it's been posted before HOW to do this, but I'm wondering how many people are running these and how reliable they are a year or two later.
Has your pump been running perfect? Has anyone had a failure they think is directly related to this modification?
Apr 8, 2009, 11:49 AM
#2
I've modified the twin pumps I have and I installed a set of HO pumps from back when Buschur sold them for a friend and he has had absolutely no issues with thousands of miles of usage and racing on them.
I also modified my walbro when it was a single pump and it had been used for probably 50,000 miles before I modified and and I put probably another 2,000 miles on it before I switched to the twin intake setup. The pump worked great as a backup until I dropped it and broke the nipple off...
I also modified my walbro when it was a single pump and it had been used for probably 50,000 miles before I modified and and I put probably another 2,000 miles on it before I switched to the twin intake setup. The pump worked great as a backup until I dropped it and broke the nipple off...
Apr 8, 2009, 12:22 PM
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You wont have any issues until and unless your fuel line or return is pinched or blocked - then you may have a big issue
Lets face it though the chances of that are minimal
Al
Lets face it though the chances of that are minimal
Al
Apr 8, 2009, 12:57 PM
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I think you are missing the point - the by pass is a sfatey feature designed to protect that pump and car in the event that the line is blocked or damaged - eg you run over a rock and it crushes the line or if your fuel pressure regulator gets stuck closed for example - the by pass allows fuel to by pass and return to the pump and the output is clogged elsehwere in the system - kind of like a saftey valve
When you modify the pump you would have no idea that there was a problem until or unless you have a line blockage - then the pump would be working very hard to build huge pressure in the line and could over heat and fail
The prurpose to modify the pump if to force the pump to operate at higher line psi situations when lets say you are running high boost levels - e.g. 40 psi or what ever is needed to open the check valve
Generally the line pressure is a static amount of say 43 psi or so - give or take - and you have a rising rate fuel pressure regulator which references manifold pressure to overcome the effects of forced induction and maintain a even injection pressure so when you apply say 40 psi of boost then you get a total fuel pressure psi of 83 with an effective pressure of fuel injecting into the manifold of 40 psi. The pump would need to flow a steady 83 psi of pressure given the needs of the particular injectors at a give IDC.
I hope this clarifies the matter
When you modify the pump you would have no idea that there was a problem until or unless you have a line blockage - then the pump would be working very hard to build huge pressure in the line and could over heat and fail
The prurpose to modify the pump if to force the pump to operate at higher line psi situations when lets say you are running high boost levels - e.g. 40 psi or what ever is needed to open the check valve
Generally the line pressure is a static amount of say 43 psi or so - give or take - and you have a rising rate fuel pressure regulator which references manifold pressure to overcome the effects of forced induction and maintain a even injection pressure so when you apply say 40 psi of boost then you get a total fuel pressure psi of 83 with an effective pressure of fuel injecting into the manifold of 40 psi. The pump would need to flow a steady 83 psi of pressure given the needs of the particular injectors at a give IDC.
I hope this clarifies the matter
Last edited by DynoFlash; Apr 8, 2009 at 01:02 PM.
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