To all of you who share your knowledge, thanks. I have a question about 1150 fuel pumps. My motor is a '78 with the most basic pulse operated rectangular type pump. I am experiencing low fuel output. I have rebuilt the pump twice with new check valves the last time. Compression test was at 120 psi here in Colorado. All fuel lines inside the motor are new with hose clamps securely fastened. Squeeze the bulb, watch the filter fill up, and within 2 minutes watch all fuel be consumed. I used my automotive fuel pressure tester at the discharge to carbs and I had maybe 3 psi. I have read that should be around 5-7 psi to function correctly. Is there a test for the pulse pressure to pump. I have detached the two lines and felt the pulse while cranking, but it didn't feel very strong to me. Not sure how much is necessary to operate fuel pump, but couldn't figure out a way to duplicate to bench test. I haven't done a suction test at fuel pump intake yet. I took the fuel cap off the tank while running and no difference. I read here that a fuel line could collapse on itself which might affect the pumps ability to pull fuel from the tank, but the low pressure reading while cranking bothers me. Do any of you guru's have a fresh outlook you could provide. Thank you in advance for considering this request.
