davidherbert0007@gmail.co 1 #1 Posted June 12 I have a 416-8 with the onan. The fuel pump is not working. I have bought a new one with no success. It is just not drawing the gas. Share this post Link to post Share on other sites
cleat 6,100 #2 Posted June 12 4 minutes ago, davidherbert0007@gmail.co said: I have a 416-8 with the onan. The fuel pump is not working. I have bought a new one with no success. It is just not drawing the gas. Is the fuel line fairly new and on good shape. Ethanol gas is hard on them. Also vacuum line needs to be good behind the pump. 2 Share this post Link to post Share on other sites
davidherbert0007@gmail.co 1 #3 Posted June 12 Brand new fuel line. I only use non ethanol gas. Where does the vacuum line originate 1 Share this post Link to post Share on other sites
cleat 6,100 #4 Posted June 12 It just goes to a nipple in the block behind the fuel pump. Can you blow air through the fuel line back into the tank ? Share this post Link to post Share on other sites
cleat 6,100 #5 Posted June 12 It just goes to a nipple in the block behind the fuel pump. Can you blow air through the fuel line back into the tank ? Sometimes I find it helps to blow into the fuel tank while cranking the engine to prime the pump. You need to be a contortionist but it Sometimes helps. Share this post Link to post Share on other sites
davidherbert0007@gmail.co 1 #6 Posted June 12 I'll check the line from the nipple to the pump Share this post Link to post Share on other sites
squonk 41,171 #7 Posted June 12 You may have a clogged screen in the tank. 2 Share this post Link to post Share on other sites
953 nut 55,394 #8 Posted June 12 You may want to remove the fuel hose from the pump and place it in a container lower than the fuel tank. You should have good gravity flow. Once the line is full of gas then connect it to the pump. Fuel pumps are good pushers but they suck at sucking. Share this post Link to post Share on other sites
lynnmor 7,322 #9 Posted June 12 Yes, the place to start is at the petcock in the bottom of the gas tank. The fuel pump is more correctly called a pulse pump since it uses the pulsing pressure changes in the engine crankcase to operate the diaphragm. That pulse line should be changed when the gas lines are changed. Share this post Link to post Share on other sites
WHX?? 48,853 #10 Posted June 13 (edited) If the fuel pump is one of those cheapies off fleabag be wary. Possible dead in box. Ihad one with foreign material hanging up a check valve. Edited June 13 by WHX?? 1 Share this post Link to post Share on other sites
