Fuel Pressure
Thread Starter
Instructor
Joined: Mar 2014
Posts: 104
Likes: 0
From: Frankfort IL
Fuel Pressure
Ok, I rebuilt the E4ME and on the first drive the fuel pump stopped... of course. Well I called auto zone and they had one in stuck. I bought it and installed it, (learned all sorts of new words doing this) Well I started shooting gas through the top of the carb. Took it apart 4 different times to verify the float level was correct etc. It kept spraying out. I finally looked up the part that auto zone sold me
http://www.fuelpumpu.com/vehicle-search.aspx
apparently this pump puts out 7.5 to 9 psi, now if my research is correct the quadrajet can't take that much fuel pressure. It would force the needle out of the seat causing the flooding and fuel spraying out. Is this correct? I guess the roper fuel pressure should be under 4 psi correct? I think I'm just going to return this pump and order the proper one for this.
Can anyone verify the required pressure as well as inform me if the symptoms I experienced could be caused by high fuel pressure?
http://www.fuelpumpu.com/vehicle-search.aspx
apparently this pump puts out 7.5 to 9 psi, now if my research is correct the quadrajet can't take that much fuel pressure. It would force the needle out of the seat causing the flooding and fuel spraying out. Is this correct? I guess the roper fuel pressure should be under 4 psi correct? I think I'm just going to return this pump and order the proper one for this.
Can anyone verify the required pressure as well as inform me if the symptoms I experienced could be caused by high fuel pressure?
Le Mans Master
Joined: May 2007
Posts: 5,009
Likes: 1,116
From: North tonawanda NY
You are correct... If I remember correctly that carb likes 2.5-3 psi. check your oil for gas too... I bought a boat where someone had putt too powerful a pump on it and the oil was full of gas just from the few times it was started and idled...(electric pump so PO might have had the key in on position without the engine running as well)
They make adjustable mechanical pumps with a return line or you could go with a regulator as well...
They make adjustable mechanical pumps with a return line or you could go with a regulator as well...
Last edited by augiedoggy; May 19, 2014 at 08:15 AM.
Thread Starter
Instructor
Joined: Mar 2014
Posts: 104
Likes: 0
From: Frankfort IL
You are correct... If I remember correctly that carb likes 2.5-3 psi. check your oil for gas too... I bought a boat where someone had putt too powerful a pump on it and the oil was full of gas just from the few times it was started and idled...(electric pump so PO might have had the key in on position without the engine running as well)
They make adjustable mechanical pumps with a return line or you could go with a regulator as well...
They make adjustable mechanical pumps with a return line or you could go with a regulator as well...
Thread Starter
Instructor
Joined: Mar 2014
Posts: 104
Likes: 0
From: Frankfort IL
You are correct... If I remember correctly that carb likes 2.5-3 psi. check your oil for gas too... I bought a boat where someone had putt too powerful a pump on it and the oil was full of gas just from the few times it was started and idled...(electric pump so PO might have had the key in on position without the engine running as well)
They make adjustable mechanical pumps with a return line or you could go with a regulator as well...
They make adjustable mechanical pumps with a return line or you could go with a regulator as well...
Thread Starter
Instructor
Joined: Mar 2014
Posts: 104
Likes: 0
From: Frankfort IL
You are correct... If I remember correctly that carb likes 2.5-3 psi. check your oil for gas too... I bought a boat where someone had putt too powerful a pump on it and the oil was full of gas just from the few times it was started and idled...(electric pump so PO might have had the key in on position without the engine running as well)
They make adjustable mechanical pumps with a return line or you could go with a regulator as well...
They make adjustable mechanical pumps with a return line or you could go with a regulator as well...
