Fernando Mendes Posted May 13, 2017 Report Share Posted May 13, 2017 I ask if you have any experience about to put fuel filter between carburetor and fuel pump.Is this procedure possible to cause a bad functioning of the engine when in 2nd and 3rd shifting?Thanks. Quote Link to comment Share on other sites More sharing options...
NiftyFifty Posted May 14, 2017 Report Share Posted May 14, 2017 I have one just before my electric pump and one just before the carb, never had any issues, but I also don't run a manual fuel pump. As long as you have a good flowing 5/16 filter you should be fine Quote Link to comment Share on other sites More sharing options...
Radarsonwheels Posted May 14, 2017 Report Share Posted May 14, 2017 Claro que no. Se puede poner un filter de bastante talle antes o dispues del bomba. De vez en cuando a mi me gusta poner uno antes y despues! La unica manera que puede functionar mal es si hay un restriction en la linea o si su filter no es bastante grande Quote Link to comment Share on other sites More sharing options...
Fernando Mendes Posted May 14, 2017 Author Report Share Posted May 14, 2017 Thanks guys.But my friend(mechanic) thinks that my only fuel filter between pump and carb is causing air leak.I am suspecting too that my problem is my distributor vacuum chamber copper lining.I re-did the ends of the copper lining.My problem is when I begin to climb a simple road in 3rd shifting it begin to faults.Do you understood me?My pump and carb is ok. Quote Link to comment Share on other sites More sharing options...
NiftyFifty Posted May 14, 2017 Report Share Posted May 14, 2017 If it's clamped properly I see no reason it can suck air, but is that a 1/4" or 5/16 filter? I prefer the metal style double male filters, not a fan of plastic is a hot environment, even that high up. if your sucking air, more likely vacuum line or carb base gasket 1 Quote Link to comment Share on other sites More sharing options...
Fernando Mendes Posted May 14, 2017 Author Report Share Posted May 14, 2017 3 hours ago, 4mula-dlx said: If it's clamped properly I see no reason it can suck air, but is that a 1/4" or 5/16 filter? I prefer the metal style double male filters, not a fan of plastic is a hot environment, even that high up. if your sucking air, more likely vacuum line or carb base gasket The hose is 7mmx11mm or 9/32"x7/16". Quote Link to comment Share on other sites More sharing options...
NiftyFifty Posted May 14, 2017 Report Share Posted May 14, 2017 It is a little small, but I still don't think it's your problem. Can you get a 8 or 9mm inside diameter line? Quote Link to comment Share on other sites More sharing options...
torqczar Posted May 14, 2017 Report Share Posted May 14, 2017 i don't think a filter can suck air on the pressure side of pump , that would be leak .Ha Ha. If you a problem at top of second it is usually a fuel volume issue , a dirty filter, low float level , air leak in suction line, clogged suction line , fuel pump.. Did the motor stall?. Not a big fan of fuel filter on suction side. Closer to carburetor , I think is better. 1 Quote Link to comment Share on other sites More sharing options...
Dennis46PU Posted May 14, 2017 Report Share Posted May 14, 2017 (edited) 1. You might have something restricting the fuel on the fuel line inside your tank. 2. A leaking fitting on the fuel line between the tank and the pump. 3. A bad fuel pump sucking air. 4. Look for a pinched fuel line. Plus what has already been mentioned, float level incorrect, too small fuel filter, fuel filter dirty inside restricting flow. Have you done a fuel pump pressure test? Edited May 14, 2017 by Dennis46PU Quote Link to comment Share on other sites More sharing options...
Fernando Mendes Posted May 14, 2017 Author Report Share Posted May 14, 2017 32 minutes ago, Dennis46PU said: 1. You might have something restricting the fuel on the fuel line inside your tank. 2. A leaking fitting on the fuel line between the tank and the pump. 3. A bad fuel pump sucking air. 4. Look for a pinched fuel line. Plus what has already been mentioned, float level incorrect, too small fuel filter, fuel filter dirty inside restricting flow. Have you done a fuel pump pressure test? 1.I always is checking the brackets in the plastic hose 2.there is no fitting between tank and pump 3.My pump is pumping well 4.there is no pinched line 5.No float level incorrect,because my PU already ran very well,including in 2nd and 3rd shifting. Quote Link to comment Share on other sites More sharing options...
ggdad1951 Posted May 15, 2017 Report Share Posted May 15, 2017 I have filters right before the carb and on the pump no problems. Quote Link to comment Share on other sites More sharing options...
Fernando Mendes Posted May 16, 2017 Author Report Share Posted May 16, 2017 On 13/05/2017 at 11:49 PM, Radarsonwheels said: Claro que no. Se puede poner un filter de bastante talle antes o dispues del bomba. De vez en cuando a mi me gusta poner uno antes y despues! La unica manera que puede functionar mal es si hay un restriction en la linea o si su filter no es bastante grande The rate of flow is the same in S1 and S2.I will try this major filter. Quote Link to comment Share on other sites More sharing options...
Radarsonwheels Posted May 16, 2017 Report Share Posted May 16, 2017 Howdy Your math is better than my spanish! I have increased fuel lines from 5/16 inch to 3/8 inch on high rpm bored stroked motors, but I'm not sure if I ever sustained high rpms enough to really need it. I don't see how a 2-3 shift would reveal a fuel problem? If there is a restriction in the fuel system I would expect to see it going lean at extended high rpm as the pump fails to keep the float bowl full. Can you do an A-B-A test- A- fuel filter installed (problem?) B- line ran straight to the carb, no filter (no problem?) A- put filter back on (problem returned?) Good luck! Quote Link to comment Share on other sites More sharing options...
Radarsonwheels Posted May 16, 2017 Report Share Posted May 16, 2017 Oh and I apologize- I see now portuguese would have worked better! Sorry Quote Link to comment Share on other sites More sharing options...
Fernando Mendes Posted May 16, 2017 Author Report Share Posted May 16, 2017 On 14/05/2017 at 4:05 PM, torqczar said: i don't think a filter can suck air on the pressure side of pump , that would be leak .Ha Ha. If you a problem at top of second it is usually a fuel volume issue , a dirty filter, low float level , air leak in suction line, clogged suction line , fuel pump.. Did the motor stall?. Not a big fan of fuel filter on suction side. Closer to carburetor , I think is better. It stalls climbing (running) in 3rd shifting,only in this situation.I am suspecting too to the distributor spring/weight and vacuum chamber. Quote Link to comment Share on other sites More sharing options...
Fernando Mendes Posted May 17, 2017 Author Report Share Posted May 17, 2017 I changed the filter and tried to start and saw a leak on the floor.I went under the pump and saw this leak in this screw with yellow color where the thick rubber damaged per gasoline action.Now I will choose another material,not rubber. Quote Link to comment Share on other sites More sharing options...
Fernando Mendes Posted May 17, 2017 Author Report Share Posted May 17, 2017 Now trying with special paper gaskets(1,6mm x 5=8mm) Quote Link to comment Share on other sites More sharing options...
ggdad1951 Posted May 17, 2017 Report Share Posted May 17, 2017 do you have pure gasoline or is there alcohol in it? Non pure can make gaskets go bad. Quote Link to comment Share on other sites More sharing options...
Dennis46PU Posted May 17, 2017 Report Share Posted May 17, 2017 (edited) On 5/14/2017 at 2:45 PM, Fernando Mendes said: 1.I always is checking the brackets in the plastic hose 2.there is no fitting between tank and pump 3.My pump is pumping well 4.there is no pinched line 5.No float level incorrect,because my PU already ran very well,including in 2nd and 3rd shifting. Hmmm... You have a fitting at the tank where your line connects and a fitting at the pump where your line connects. Just because your pump is pumping well doesn't mean it's not leaking, right? Looks like you found a problem. I'd get rid of those plastic lines to BTW. They don't do very well with heat. Edited May 17, 2017 by Dennis46PU Quote Link to comment Share on other sites More sharing options...
Fernando Mendes Posted May 17, 2017 Author Report Share Posted May 17, 2017 3 hours ago, ggdad1951 said: do you have pure gasoline or is there alcohol in it? Non pure can make gaskets go bad. With 27% alcohol Quote Link to comment Share on other sites More sharing options...
Fernando Mendes Posted May 17, 2017 Author Report Share Posted May 17, 2017 56 minutes ago, Dennis46PU said: Hmmm... You have a fitting at the tank where your line connects and a fitting at the pump where your line connects. Just because your pump is pumping well doesn't mean it's not leaking, right? Looks like you found a problem. I'd get rid of those plastic lines to BTW. They don't do very well with heat. My fuel system only have fitting on outlet pump.The leak was in the pump because the rubber(5mm) damaged.I put another filter between tank and pump.My PU always had only one filter between pump and carburetor(since 1987). Quote Link to comment Share on other sites More sharing options...
rekbender Posted May 17, 2017 Report Share Posted May 17, 2017 Is your problem solved? I had a sediment bowl filter on my '53 B4C a while back and never had a problem. Do you have the heat shield between the exhaust manifold and the pump? I also made an additional shield to help keep the metal line to the carb cooler. My problem was vapor lock. Hope this helps. Quote Link to comment Share on other sites More sharing options...
Fernando Mendes Posted May 18, 2017 Author Report Share Posted May 18, 2017 10 hours ago, rekbender said: Is your problem solved? I had a sediment bowl filter on my '53 B4C a while back and never had a problem. Do you have the heat shield between the exhaust manifold and the pump? I also made an additional shield to help keep the metal line to the carb cooler. My problem was vapor lock. Hope this helps. Don't know yet.I will do the test today or tomorrow.Now I am observing if there is leak yet.Don't have heat shield.I don't know what means "vapor lock" and what it do(?). Quote Link to comment Share on other sites More sharing options...
Radarsonwheels Posted May 18, 2017 Report Share Posted May 18, 2017 (edited) Vapor Lock is when the fuel in the line boils and pushes a big bubble of steam into the line that won't allow liquid fuel through. This often happens parking after a drive- no more fresh gas is cooling off the line and then it will be hard to start. Alcohol makes it worse. My truck is 12 volt so when my mechanical pump went south a cheap quiet electric fuel pump got put on. Easy reversable modification. Edited May 18, 2017 by Radarsonwheels Typo Quote Link to comment Share on other sites More sharing options...
Fernando Mendes Posted May 18, 2017 Author Report Share Posted May 18, 2017 Share to us this easy reversable modification.Send pics.Thanks for your inputs. Quote Link to comment Share on other sites More sharing options...
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