hoofchaz Posted October 30, 2008 Report Share Posted October 30, 2008 I have a '53 Plymouth with a bone stock 218 flathead. When the car sits for a week or so the gas drains out of the fuel line from the pump to the carb, and the only way I can get it going again is pulling the line off the carb and "priming" it. It did it again today, it will fire up and run until the carb bowl is empty, but it won't pull any fuel from the line. The float bowl on the fuel pump is full of fuel, and it is a new pump. If I pour fuel in the carb it will run, but it still won't prime that hard line from the pump to the carb. Is this just something I am stuck dealing with? Thanks, CHAZ Quote Link to comment Share on other sites More sharing options...
Normspeed Posted October 30, 2008 Report Share Posted October 30, 2008 Chaz, if the new pump is not pumping fuel it could be a bad flex hose between the steel line on the frame and the inlet side of the fuel pump. Quote Link to comment Share on other sites More sharing options...
hoofchaz Posted October 30, 2008 Author Report Share Posted October 30, 2008 If I prime the hard line from the pump to the carb it works fine. It just won't pump fuel up through the line when it drains empty? CHAZ Quote Link to comment Share on other sites More sharing options...
Merle Coggins Posted October 30, 2008 Report Share Posted October 30, 2008 It sounds like you may have a bad check valve in your fuel pump. If your pump is fairly new, maybe there is a piece of debris that is keeping the check valve from seating properly. If it's an old pump, maybe it's time to replace it. Merle Quote Link to comment Share on other sites More sharing options...
Frank Elder Posted October 30, 2008 Report Share Posted October 30, 2008 You are probably only priming the hard line and NOT the flex between the pump and the hardline. Check for kinks or seepage, tie a clean dry strip of cloth at bottam of line see if it collects gas. If you are impatient just remove line and do a visual. Hook line up to air very, very low psi plug other end and submerge. AIR bubbles mean leak. Sorry, Should have mentioned blow out flex first as it may be rotting on the inside or plugged with other debris. Do you have gas in pump bowl, and have you cleaned it and other lines back to the tank? Check for fuel filter in line some times people hide them in front of tank. Good luck! Quote Link to comment Share on other sites More sharing options...
Jim Saraceno Posted October 31, 2008 Report Share Posted October 31, 2008 When you say "new" pump do you mean new or NOS? NOS pumps can go bad real fast from brittle rubber and new gas. The voice of experience. Quote Link to comment Share on other sites More sharing options...
oldmopar Posted October 31, 2008 Report Share Posted October 31, 2008 I have a NAPA fuel filter screwed in on the pump input side. Sounds like a good idea it protects the pump and I guess you do away with the threaded type gas hose and just short piece of rubber gas hose and 2 clamps ? Quote Link to comment Share on other sites More sharing options...
Frank Elder Posted October 31, 2008 Report Share Posted October 31, 2008 Input side comes from gas tank, output side to carb, thus the flex line would still be in position. Quote Link to comment Share on other sites More sharing options...
oldmopar Posted October 31, 2008 Report Share Posted October 31, 2008 Input side comes from gas tank, output side to carb, thus the flex line would still be in position. He said it is on the input side which is where the threaded gas flex hose goes from the fuel line to the pump so if its on the input side how or why would it still be used Quote Link to comment Share on other sites More sharing options...
Frank Elder Posted October 31, 2008 Report Share Posted October 31, 2008 I always thought the output side meant where the pump put out gas, sorry not trying to confuse. Thought it was like a inline fuel filter the in is hooked towards the tank and the out goes toward the carb am I wrong? Quote Link to comment Share on other sites More sharing options...
oldmopar Posted October 31, 2008 Report Share Posted October 31, 2008 I always thought the output side meant where the pump put out gas, sorry not trying to confuse. Thought it was like a inline fuel filter the in is hooked towards the tank and the out goes toward the carb am I wrong? look back at the photo shel just posted Quote Link to comment Share on other sites More sharing options...
Frank Elder Posted October 31, 2008 Report Share Posted October 31, 2008 Thanks, here is where I got fried, had the input side confused, this my first car like this. I know, no excuse, just so used to 70's mopars. Forgot that the line snakes around to the front of the pump and the output is on the aft side!Thank you again for walking me through it. Quote Link to comment Share on other sites More sharing options...
hoofchaz Posted October 31, 2008 Author Report Share Posted October 31, 2008 I have an inline filter along the frame, and it is a new (not NOS) pump, but it is the old style with a float bowl. I loosened up the float bowl and it was full of gas, so it is just between the pump and the carb. I will have to check the check valve in the pump, how should I go about that? Thanks, CHAZ Quote Link to comment Share on other sites More sharing options...
Merle Coggins Posted October 31, 2008 Report Share Posted October 31, 2008 I will have to check the check valve in the pump, how should I go about that?Thanks, CHAZ You'll have to remove the pump and take it apart. Take the top cover off and you'll find the check valves up inside the cover section. There will probably be a keeper plate holding them in. They'll be facing oposite directions (one in, one out) Be sure to note how they are so that they go back the same way. If they get reversed the pump won't pump. Merle Quote Link to comment Share on other sites More sharing options...
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