Early Ford V-8 Club Forum

EFV-8 Club Forum / General Ford Discussion / 1949 fuel pump rod problem flathead 8

Reply to Discussion | New Discussion << previous || next >>

Posted By Discussion Topic: 1949 fuel pump rod problem flathead 8 -- page: 1 2     TomO 03-20-2019 @ 8:48 AM reply profile send p.m. Senior Posts: 7250 Joined: Oct 2009 It sounds like you may have a vacuum leak in the supply side to the fuel pump and it most likely is the sediment bowl gasket. Your pump can suck enough gas from the tank to almost fill the bowl, but not enough to bring it into the pump. Check the sediment bowl gasket on the fuel pump for cracks or signs that it was over-tightened, the bowl thumbscrew should be finger tight, over-tightening can warp the bowl seat and ruin the gasket. If a new gasket doesn't solve the problem, try some of the following stuff. Replace the flex line from the tank line to the fuel pump (it may have a small vacuum leak) Use the correct flex line for your vehicle, do not use fuel line with hose clamps, they usually leak vacuum or can collapse when vacuum is applied. Check that the screws that hold the diaphragm are tight, , check the line from the tank for blockage, check the fitting at the tank for tightness. Use a vacuum gauge to check out the fuel pump and the lines to the tank: 1) Disconnect the fuel line at the pump and install a short piece of fuel line so the vacuum gauge can be connected to the input of the fuel pump. Connect the gauge to the pump input. 2) Fill the carburetor bowl with gas (I use the bowl vent tube in the top of the carburetor to do this) 3) Start the engine and read the vacuum gauge, it should read at least 6 inches of mercury. If it does not, check for the following conditions, leaking sediment bowl, stretched or loose diaphragm or a worn push rod. The push rod should put pressure on the pump arm when you try to install it and the rod should move about 1/4" from the bottom to the top of the stroke. 4) If the pump passed the vacuum test, reconnect the fuel lines to the pump. 5) Disconnect the fuel line at the tank and connect the vacuum gauge to the line. 6) Run the engine and read the vacuum gauge, it should read the same as the reading at the fuel pump. If it does not, there is a vacuum leak in the line to the pump, most likely in the flex line. Tom 37RAGTOPMAN 03-20-2019 @ 7:43 AM reply profile send p.m. Senior Posts: 1958 Joined: Oct 2009 hi What I am reading here, is you get fuel from the tank to the fuel pump,right engine runs when you use a separate fuel supply ...right is this pouring gas down the carb ? with air cleaner removed ? or using a fuel line connected to the carb, ? you might have a float problem in stuck up position it might be the line from pump to carb is clogged ? any kinks, blow it out, to be sure !! I have seen bees, built nests, out of clay, in fuel line inlets, in the pump and carb inlets, is the air cleaner clean, no obstructions,? get back to us with more, hope this helps 37RAGTOPMAN Greg58 03-20-2019 @ 3:15 AM reply profile send p.m. Member Posts: 24 Joined: Jul 2016 Have you tried pumping either pump by hand? I tested mine by connecting it back to the line from the tank and moving the arm by hand, don't push the arm very far on each stroke or you might damage the pump. If you remove the pump take a screw driver and push down on the pump rod with engine running on your bottle and see how much the rod moves up and down. I've heard of two different type pumps, my 50 uses the one with the cup on the arm. Greg TonyF 03-19-2019 @ 6:31 PM reply profile send p.m. Member Posts: 5 Joined: Mar 2019 I’ve preformed this test last week. , test results are zero gas coming from both pumps that I have had on truck. Both pumps are getting gas from tank but not to carb. Notta, nothing. I’ll feed carb with bottle to keep engine running with line disconnected to carb and nothing comes out but is getting fuel to pump from tank . TomO 03-19-2019 @ 7:14 AM reply profile send p.m. Senior Posts: 7250 Joined: Oct 2009 Tony, A more detailed description of your problem would help. I suggest that you do the fuel delivery test in the post that this link takes you to and then post the results. https://www.earlyfordv8.org/forum/viewmessages.cfm?Forum=16&Topic=7440&keywords=fuel%20delivery The test results will help us understand your problem better. We will need the actual amount of fuel that the pump delivered in the test, to give you help. Tom TonyF 03-19-2019 @ 5:20 AM reply profile send p.m. Member Posts: 5 Joined: Mar 2019 Pump is from Speedway, metal line to rubber line from tank TonyF 03-19-2019 @ 5:11 AM reply profile send p.m. Member Posts: 5 Joined: Mar 2019 I have line off at carb and it pulls gas from tank and fills bowl with gas but doesn’t pump fuel out yo carb. It is the 49-50 pump pauls39coupe 03-18-2019 @ 5:56 PM reply profile send p.m. Member Posts: 205 Joined: Jul 2014 Try taking the line off at the carb, then crank the engine with the starter to see if you are getting fuel out of the pump. Use caution and have someone with catch can to hold the fuel. You may have a stuck or plugged inlet valve or a carburator float that is hung up. We have had good luck with Bob Drake's fuel pumps, and they seem to hold up to E-10 fuel. If you are not getting fuel out of the pump, be sure the line to the tank is not plugged or broken. The flex line going to the pump is another source of trouble as they harden and will draw air around the brass fittings rather than pulling fuel. ken ct. 03-18-2019 @ 12:43 PM reply profile send p.m. Senior Posts: 1513 Joined: Jan 2010 Is it rubber from tank to FP all the way ??? ken ct. New pumps for the past couple of yrs all made in China. Have poor rubber diaphrams and vaves. Sounds like you have NOT a 34 FP on there. 34,35,anearly 36 pumps measure 2" across bowl with the top cover off.It is a unique pump to those yrs. 37 up pumps measure 2 1/4" across with out cover. Sounds like you have a glass bowl later one on there going by your description of the valves. they are pressed in and cannot be replaced. ken ct. TonyF 03-18-2019 @ 9:51 AM reply profile send p.m. Member Posts: 5 Joined: Mar 2019 It ran for the first day I bought it then only was getting gas to pump, replaced with new pump this weekend and same results. And it does have rubber line to tank . Thx

<< previous || next >>

PAGE: 1 2

NOTE: YOU MUST BE A REGISTERED USER AND BE LOGGED IN TO POST (and reply to) messages in this forum. If you are a first time user, please click the CREATE A NEW ACCOUNT in the masthead above to register and Log In. After that, all you do is LOG IN to enjoy using this site.

DISCLAIMER: The V-8 Club does no independent testing of any of the opinions, thoughts or suggestions presented in the website on the Forum, in the Tech Tips section, or any section. A reader should consider the website to be a forum wherein differing solutions to a particular set of circumstances may be discussed. Ultimately, the selection of an item for an individual's vehicle must be based upon the independent study of the vehicle owner in consultation with people in the hobby and restoration experts.

EFV-8 Club Forum Home | Back to Home Page | Contact the Webmaster

Copyright © 2009 - EFV-8.org
Powered by < CF FORUM > v.2.1