None_zero Posted February 24, 2023 Author Report Share Posted February 24, 2023 16 minutes ago, datzenmike said: I think time for another pump. Get something that produces 3-4 PSI. Ok so I have this holley mighty mite Part number 12-427. It's specs are 4-7 psi 32 gph I know it's not ideal but until I can get one shipped it's gotta be better than a leaking one Quote Link to comment
None_zero Posted February 24, 2023 Author Report Share Posted February 24, 2023 (edited) I also have some fuel line so i'm going to replace the section between the hard line and the port feeding the carb through the needle valve I'll go on rockauto and order the right pump I still need to get that accelerator cable anyways.. I'm trying to think if I need anything else. Although I guess they don't have free shipping on larger orders since they ship everything from different locations and charge separate shipping on everything. Edited February 24, 2023 by None_zero Quote Link to comment
None_zero Posted February 24, 2023 Author Report Share Posted February 24, 2023 (edited) Just so I know what it was. I'm trying to figure out what this part number is But I can't make it out. Best I can tell there are 3 lines of numbers Line one CH-1185 Line two ??-?235 Line three ?3716 or 46.... I've tried searching the number but got nothing. There are several options on rockauto listed for the z20 not all of them give a psi rating but they range from 4 psi to 8.7 psi and one doesn't give a psi just a gph of 76. Why do they have such a wide range for just 2 liter engine --- ok some of that I misread, I'm not even really ashamed that I didn't know what a pferdstark was. Edited February 24, 2023 by None_zero Additional info Quote Link to comment
datzenmike Posted February 24, 2023 Report Share Posted February 24, 2023 Just make sure this wire is unplugged.... Quote Link to comment
None_zero Posted February 24, 2023 Author Report Share Posted February 24, 2023 Just now, datzenmike said: Just make sure this wire is unplugged.... I see perhaps where the confusion came from. I see the plug I disconnected there but there is more going on than that. So you just meant disconnect it at the carb?not the plastic connector? Quote Link to comment
None_zero Posted February 24, 2023 Author Report Share Posted February 24, 2023 This seems like the closest thing I can find to what you said Quote Link to comment
datzenmike Posted February 24, 2023 Report Share Posted February 24, 2023 5 minutes ago, datzenmike said: Just make sure this wire is unplugged.... It's the only single wire with a plastic plug. Unplug. Quote Link to comment
None_zero Posted February 24, 2023 Author Report Share Posted February 24, 2023 Ok that's my bad The line coming out of this where the blue red and white wires are is disconnected. And has been since yesterday when I looked earlier I was pulled off in a church parking lot with people sweating me thinking I was up to something and I saw the ground wire connected to the tab by vac advance valve and thought "the wire to the distributor" was connected. Quote Link to comment
None_zero Posted February 24, 2023 Author Report Share Posted February 24, 2023 Is that USEP-8318 fuel pump the one I need you think? Quote Link to comment
datzenmike Posted February 24, 2023 Report Share Posted February 24, 2023 Try for something with low pressure like under 5 PSI. Quote Link to comment
NC85ST Posted February 24, 2023 Report Share Posted February 24, 2023 That Holley will work just fine, although I don’t care for the length of it. The other pump you show is not the factory pump, it’s a no-name aftermarket. Quote Link to comment
datzenmike Posted February 24, 2023 Report Share Posted February 24, 2023 What are the specs on the Holly pump? Quote Link to comment
Thomas Perkins Posted February 24, 2023 Report Share Posted February 24, 2023 15 hours ago, None_zero said: Ok so I have this holley mighty mite Part number 12-427. It's specs are 4-7 psi 32 gph I know it's not ideal but until I can get one shipped it's gotta be better than a leaking one,The holley is loud on start up. 1 Quote Link to comment
datzenmike Posted February 24, 2023 Report Share Posted February 24, 2023 A Holly 12-426 is 1.5 to 4 PSI.. Summit: https://www.summitracing.com/parts/hly-12-426 Quote Link to comment
Thomas Perkins Posted February 24, 2023 Report Share Posted February 24, 2023 I just read that that Holley will work,says it's noisy on start up.I have been using the stock one's 17020-10W00 in mine,nothing else.I have a brand new spare.It is now showing that Nissan is out of them. Mike just showed one Holley. Quote Link to comment
None_zero Posted February 24, 2023 Author Report Share Posted February 24, 2023 3 hours ago, datzenmike said: A Holly 12-426 is 1.5 to 4 PSI.. Summit: https://www.summitracing.com/parts/hly-12-426 If I had that one that'd be great but I got the one up from that Quote Link to comment
None_zero Posted February 24, 2023 Author Report Share Posted February 24, 2023 3 hours ago, Thomas Perkins said: I just read that that Holley will work,says it's noisy on start up.I have been using the stock one's 17020-10W00 in mine,nothing else.I have a brand new spare.It is now showing that Nissan is out of them. Mike just showed one Holley. This is accurate. It is much louder than the other one and if I had the lower psi version it probably would be a great replacement but I got the mighty might or whatever it's called and it is effecting the way the truck is running a little bit Quote Link to comment
None_zero Posted February 24, 2023 Author Report Share Posted February 24, 2023 (edited) Noticeably more engine vibration and fuel consumption not really improved from the leaky one I may pull over and try option 3 in a sec Edited February 24, 2023 by None_zero Quote Link to comment
None_zero Posted February 24, 2023 Author Report Share Posted February 24, 2023 I also removed the fuel filter that was between the tank and pump since that pump has its own filter going into it. Maybe I should put that back and just run it through both of them? Quote Link to comment
None_zero Posted February 24, 2023 Author Report Share Posted February 24, 2023 (edited) Advanced didn't have anything im at O'Reilly they have an edelbrock 2-3.5 psi I guess that's not gonna work either..... after talking to the guy at orielly he got one from the back it's a precision E16010 rates 2.3- 9 psi he says it's self regulating what does that mean? Edited February 25, 2023 by None_zero Quote Link to comment
datzenmike Posted February 25, 2023 Report Share Posted February 25, 2023 Edelbrock 3.5 is fine!!! the stock pump is 3-4 PSI. If it puts out 9 PSI that's 3 times what you need!!! The problem of too much pressure is it will force it's way into the float chamber and flood. This is what we are trying to avoid. Take it back. Self regulating means the pump sets it's own pressure and maintains it, or tries to. You won't need an external regulator. Quote Link to comment
None_zero Posted February 25, 2023 Author Report Share Posted February 25, 2023 9 minutes ago, datzenmike said: Edelbrock 3.5 is fine!!! the stock pump is 3-4 PSI. If it puts out 9 PSI that's 3 times what you need!!! The problem of too much pressure is it will force it's way into the float chamber and flood. This is what we are trying to avoid. Take it back. Self regulating means the pump sets it's own pressure and maintains it, or tries to. You won't need an external regulator. Crap. I guess I'm not understanding something here. If 2-3.5 is ok but 4- 7 not ok. Why does it have a range anyway. I am trying to educate myself according to this the regulator should stop it flooding.. help me understand what this means please Quote Link to comment
None_zero Posted February 25, 2023 Author Report Share Posted February 25, 2023 And while you lecture I'll go return this pump 1 Quote Link to comment
datzenmike Posted February 25, 2023 Report Share Posted February 25, 2023 The stock electric fuel pump pushes the gas with 2.7 to 3.4 pounds of pressure. This is what the float in the carburetor expects to get. Running anything higher risks the fuel being forced into the float chamber past the needle valve filling it and flooding. Quote Link to comment
None_zero Posted February 25, 2023 Author Report Share Posted February 25, 2023 (edited) So the needle valve is the regulator and the increased pressure pushes the float down and allows the fuel in? Or rather I guess since it's spring loaded it would only have to push the spring Edited February 25, 2023 by None_zero Quote Link to comment
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