Nice140Y Posted April 11, 2011 Report Share Posted April 11, 2011 Hi All, Can anyone tell me if I can run a Weber 32/36DGV with the stock mechanical pump on my very stock L16 motor. What do I do with the return line that was attached to my stock Hitachi carb? Do I need to get an electric pump? Thank you. Quote Link to comment
Logical1 Posted April 11, 2011 Report Share Posted April 11, 2011 Mechanical pump on your L16 will work great, Just plug the return line unless you want to get y-adapter and with some small gauge line and use it just because. Did you decide not to run your SU's ? Quote Link to comment
ggzilla Posted April 12, 2011 Report Share Posted April 12, 2011 Stock fuel pump has the right pressure, so will work better than many electic pumps. If you get an electric pump be sure to get a low-pressure pump (3-5 lbs). 1970 510 does not have a fuel return line like the newer Datsun does it? The B310 (Datsun 210/140Y) has a return line, but it is not necessary and you can simply plug it. Quote Link to comment
Sealik Posted April 12, 2011 Report Share Posted April 12, 2011 There are benefits to run the fuel return line if so already equipped. What ever pump is used...PSI should be between 2.5 to 3lb Quote Link to comment
datzenmike Posted April 12, 2011 Report Share Posted April 12, 2011 If it has a true return line, use it. I don't think the 510s had them. Maybe you have a fuel tank vent to the PCV system? L20B motors do. There are advantages. Gas is always circulating so it is constantly being filtered over and over. This keeps the tank clean. Also cool gas is circulated past the carb which reduces or eliminates hot weather 'heat soak' of stagnant fuel in the lines under the hood causing vapor lock. Not much of a problem on a stock L16 but it is on the L20Bs. Quote Link to comment
ggzilla Posted April 12, 2011 Report Share Posted April 12, 2011 Yes, this is the same problem B210s had. So they added the fuel return line. With the emission controls they want to keep the fuel cool so it doesn't evaporate so much, and with increased underhood temperatures (larger engines) they started getting more vapor lock. The fuel return line solves both problems. Earlier Datsuns may have a fuel tank vent line, looks like the same thing, but is just a vent coming from the tank to the engine compartment to the "Flow Guide Valve" or a charcoal cannister. Quote Link to comment
Nice140Y Posted April 25, 2011 Author Report Share Posted April 25, 2011 Well guys, I put this Weber 32/36 in my 69 510 and it runs nicely, except for a small bog when you floor it. I will have to get it tuned right and see what happens. Is this normal ofr these carbs to do that? Quote Link to comment
ggzilla Posted May 2, 2011 Report Share Posted May 2, 2011 No that is not normal, and a tune-up normally won't fix it. What is usually required is to change the jetting of the Weber. But you might just only need to adjust the accelerator pump setting. Go to the library and check out the Weber book, it will have some information on how to fix it. Quote Link to comment
banzai510(hainz) Posted May 2, 2011 Report Share Posted May 2, 2011 small bog when you floor it. this is common if you floor it too fast as your mechanicall opening the second barrel before you get full air vol up. Stock carbs dont have this as the 2nd barrel open on vaccuum. So it seems smoother. personally dont fuck with it. ease in to the throttle more that just slamming it Quote Link to comment
Nice140Y Posted May 3, 2011 Author Report Share Posted May 3, 2011 Hainz, nice way to put it man.... I just think it needs some fine tuning because my car has a bit of a shake when idling. I adjusted it to idle at around 900rpm and it improved, but it is not gone. Oh and it is sucking gas like a pig... I only got 40 miles to a quarter tank. Quote Link to comment
metalmonkey47 Posted May 5, 2011 Report Share Posted May 5, 2011 You'll want to get it jetted, but I'm sure it will be just fine. Quote Link to comment
Nice140Y Posted May 6, 2011 Author Report Share Posted May 6, 2011 Pardon my ignorance, but exactly what does jetting it mean? Do I have to change the jets? What are the correct jets sizes? Thank you Quote Link to comment
Guest kamakazi620 Posted May 6, 2011 Report Share Posted May 6, 2011 Pardon my ignorance, but exactly what does jetting it mean? Do I have to change the jets? What are the correct jets sizes? Thank you put in smaller jets,i;d go 1-2 sizes down from what its jetted Quote Link to comment
frink84 Posted May 6, 2011 Report Share Posted May 6, 2011 Pardon my ignorance, but exactly what does jetting it mean? Do I have to change the jets? What are the correct jets sizes? Thank you jets are basically fuel injectors of the carb world (yes, mechanical wizards, i know it isnt anywhere near the same, but the concept is there) on the 32/36, they are located on the left and right sides of the carb, under brass flathead screws. the correct jet size depends on the mods, engine size, etc. a lot of time you just got to play with different sizes to dial it in. browsing around the engine section there are a few sizing threads. Quote Link to comment
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