Mickey Posted September 27, 2015 Report Posted September 27, 2015 Hey all,I had to replace the fuel return line....is this thing supposed to go to the MAP sensor? If not where should it go? Thanks in advance...it has always been there,so I guess that that is where it's supposed to go.. The service manual has nothing on this. Quote
Schurkey Posted September 28, 2015 Report Posted September 28, 2015 Hey all,I had to replace the fuel return line....is this thing supposed to go to the MAP sensor? If not where should it go? Thanks in advance...it has always been there,so I guess that that is where it's supposed to go.. The service manual has nothing on this. NO! The MAP sensor doesn't have fuel or fuel vapor plumbed to it. What service manual do you have? Chiltons or Haynes? Might as well dump it in the recycle bin. You need a REAL, GM service manual for your year and model vehicle. http://www.ebay.com/itm/Chevrolet-1992-Lumina-Original-Shop-Service-Manual-Book-1-and-2-/262050210566?hash=item3d0368e306&vxp=mtr http://www.ebay.com/itm/1992-CHEVROLET-LUMINA-GM-FACTORY-REPAIR-SERVICE-MANUAL-/331650757645?hash=item4d37ecf40d&vxp=mtr Quote
Mickey Posted September 28, 2015 Author Report Posted September 28, 2015 I guess basically is this,should the vacuume line coming off of the pressure regulator be squrting gas?,if it is,I guess that it's bad? Quote
Imp558 Posted September 28, 2015 Report Posted September 28, 2015 The diaphragm inside that regulator is brokedened, replace it. Quote
RobertISaar Posted September 28, 2015 Report Posted September 28, 2015 yeah, your regulator is trashed. GM says 2.0 hours of labor to replace on a 92 LQ1, but I think it can be easily done in half of that if you don't encounter any frozen fasteners. Quote
Schurkey Posted September 28, 2015 Report Posted September 28, 2015 I guess basically is this,should the vacuume line coming off of the pressure regulator be squrting gas?,if it is,I guess that it's bad? The diaphragm inside that regulator is brokedened, replace it. Yes. But that isn't the "fuel return line" It's just a vacuum hose that provides load-compensation for the injector pressure. When the injectors spray into a vacuum (light load) they need less pressure than when they spray into no vacuum (heavy load). yeah, your regulator is trashed. GM says 2.0 hours of labor to replace on a 92 LQ1, but I think it can be easily done in half of that if you don't encounter any frozen fasteners. Good info. I've never replaced one, but I did have one off the injectors. I have no idea how long it took me--but then I need two months to change a valve cover gasket. Quote
Imp558 Posted September 28, 2015 Report Posted September 28, 2015 Yes. But that isn't the "fuel return line" It's just a vacuum hose that provides load-compensation for the injector pressure. When the injectors spray into a vacuum (light load) they need less pressure than when they spray into no vacuum (heavy load). Good info. I've never replaced one, but I did have one off the injectors. I have no idea how long it took me--but then I need two months to change a valve cover gasket. Correct, the vacuum sucks on the diaphram, overcoming the spring inside some more at idle allowing more fuel to pass to the return side. If there's gas coming from the vacuum line the diaphram has degraded and cracked.... no good Quote
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