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Originally Posted by azitizz
I attached the mityvac hose to the line that exits the primer pump assembly (transparent brown line) and pumped (sucked) with the mityvac. It has various attachments to stick into varying hoses. at present the transparent line (the one on the left of the assembly in picture above) is actually spliced with a section of rubber fuel line for whatever reason. I think the mechanics who installed our greasecar veg oil system did that. It loops up then down again to another banjo bolt on the IP. So what I did is simply undo one side of the rubber fuel line and sucked with the mityvac. so the fuel is coming directly from the primer pump assembly. Not through the IP
or anything else.
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I cannot answer the question regarding pressure differences. The info is there if you search and infer. Search "pressure relief valve"
also, I am not aware of a fuel line that goes to the IP after the primer.. the lift pump / primer pump leads to the filter, the filter leads to the IP.
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I dont think we have fastlanes here up in Canada. Napa perhaps? And do you mean 'perhaps but unlikely' that its a stuck valve? or that the resistance is normal? Is it a complicated part to take apart and reassemble? (i.e little springs firing out everywhere or something)
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Fastlane is the retailer for this website only, not a chain of stores.
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Great, so do I need to remove all the lines and the primer pump to access the 3 bolts? and do you think the problem would be anymore diagnisoble by a visual inspection by removing it?
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it might be a little easier, but is by no means necessary to remove the lines. There is one nut on top, and two below the hand primer. A bit of oil will drip from the IP once you remove this pump from the IP housing.
a visual inspection will not tell you much with this pump. Buy the rebuild kit if you eliminate other variables first. There is no reason to pull this pump unless to bench test or rebuild.
I would suggest inspecting all your lines and connections before testing this pump.
As a general rule, it seems to me that these systems add an incredible amount of chaos to a very simple system. Hunting them down requires a very systematic approach.
In a perfect world, you would replace the soft metallic crush washers on each side of a banjo bolt after each disassembly.