Quote:
Originally Posted by brcidd
Jcat- isn't the fuel pump running hot due to low fuel tank level issue solved now that new style fuel pumps run inside of a canister (big gulp cup) that is constantly filled by the return line dumping into it? I would think the advice to not run below 1/3 tank level no longer applies. As far as I know, the canister idea started around 1999 - I first saw it on a '99 Yukon when I changed a FP- when I spilled it all over myself after removal.....
Your thoughts?
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with NEW vehicles that have NO return line back to the tank this may be true. on these old vehicles , as the fuel level drops the fuel heats up because of the regulator sending back excess fuel. The new vehicles , no return line , may not be causing pumps to run hot. the old vehicles , fuel may be filtered many times before used.also the amount around the pump is little. on the new vehicles that have NO return line the reason to keep the fuel level above 1/3 of a tank is , because ethanol creates dirt/crap with the air/moisture in the low level fuel . the fuel is filtered once then sent to the injectors. the vehicle has no external filter so the in tank pump filter gets clogged , then low pressure , then the miss fires which has been a big problem . the p0300 code is a way many shops guess at the vehicle owners expense. also these ethanol particles clog the injectors causing high long term FUEL trims and loss of power . it has been stated by GM and others not to operate the vehicle , with low fuel levels . lets say you run out of fuel ... the pump is designed to operate at a constant load. when the pump starts to pick up air , it over speeds damaging the armature winding . another way that the pump will die an early death. so no reason to operate with low fuel levels unless you want to loose your vehicle for some time to get fixed and pay lots of cash at the repair shops guessing. MANY INTAKE MANIFOLD GASKETS HAVE BEEN REPLACE FOR NO REASON....I just love it when the repair hacks spray carb cleaner on the plastic intake manifold gaskets GM used .....