Dave Boyer Sarcastic Member Are you being sarcastic. Thanks. I appreciate it. You comment made me laugh for some reason.
Not you the color!! Or as we type in Canada "Colour" either way I think someone forgot about 3 colors somewhere here in Canada "Gold, Silver, or Bronze"......
ive done a few fuel injection conversions on old cars and the best and easyest way i have found to put a return into a tank is by punching a hole in the wall of the tank up high. what i do is take a nail and punch a hole with it, then i use a center punch to enlarge the hole to the point where i can use the pipe tap thats they right size for the fiting im puting in. the pushed in metal gives alot of surface for the threads. Use some pipe thread sealant, not tape to seal the fiting and you should be good. the vent line should work just fine as a return with a 140 gph or smaller pump. i had a return style system on my mav for a while. first was with the mallory 140 pump. Its one of the quietest pumps ive ever used and ive used it in many vehicals. It was noisyer when used in the return style system. that pump died on me (it was a used pump out of another car i had). I replaced it with a holey blue pump, those are just noisy no mater what. Now i use the edelbrock pump. I put it on return style at first and it was pretty noisy. Edelbrock says it should be nearly silent. I called them and they didnt know anything usefull. The pump has a internal regulator that i had just set all the way to its max press so the return regulator would be the governing regulator. so next i caped off the return side and set the fuel press on the pump and it ran quieter. So thats my fuel pump knowlage that should be of some use.
Are you saying this because if you don't have a vent in the tank gas will spill out the filler neck while fueling? My car does this, it is a 69.5 and doesn't have a vent in the tank. Would adding a vent stop that from happening?
I dont think so. When I had the original tank (with venting) I still had an issue with spilling gas when fueling up. On another note, It has been mentioned before that the best place to put the fuel regulator is in front of and level to/above the carb. This is because while doing hard accelerations, the fuel will naturally flow towards the carb. How big of a deal is this. I dont do much drag racing (1/8 mile occasionally). Can I place the reg behind the carb just to keep it out of the way. I've already placed the fuel pump in front of the fuel tank which is another no-no for the same reason. Im trying to keep the busy stuff to the rear of the engine bay. Thanks
My fuel tank has a drain plug in the bottom corner. If I get a barb fitting that fits it, Is there any reason I cant run my return line to it?
I would be more inclined to go to the top of the tank. Here is my thought, you don't want to have the pressure of the weight of the fuel pushing back on the return. At 5 lbs per gallon, that could be an issue if it were to act as a restriction. Also an important function of having a return is to cool the fuel. Spraying it into the air gap above the fuel will help cool it a small amount, but more importantly it will keep the warm fuel above the pickup versus sending it right back into the pump.
factory fuel injection returns the fuel to the botom of the tank. now it does enter at the top of the the tank and then goes down a tube to the botom. it also is close to the fuel pick up. in factory fuel injected car there is a baffel around the fuel pick up and the return is located right next to the pick up. so as for you using the drain for the return i think that it would work just fine. my only concern is how it might hang down pretty far.
