1977 f150
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1977 f150
I recently had a new engine installed in my truck (351m with 4 barrel carb). I was having a problem with it stalling out as if its not getting enough fuel. I placed a spacer in between the carb and the intake. But am still getting the samething. This only happens when its really hot out. I can drive it around all night no problem. But can't enjoy it during the day. Can someone help?
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4 barrel holley carb 600 or 650 can't remeber honestly. everything is brand new on the engine. I have placed a spacer on the carb to help as well taped my fuel lines around the engine with heat tape to keep them cool. My mechnic is telling me its prolly something back by the fuel tank. either the pump is getting air or the lines are. does this make sense. I would fix it myself but don't know what to look for or how to test it. Am trying to get the truck fixed up to orignal condition with some changes of course.
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From: The Shenandoah Valley
OK .... has this been happening for several loads of fuel or is the fuel from the same station or maybe the truck has been sitting awhile? If you have winter blend in it good chance the winter fuel is boiling on those hotter late spring days (well, it's been hot here anyway).
Just out of curriosity, did you replace the short rubber line from fuel tank to steel fuel line? It's back near front center of fuel tank above axle on top of fuel tank. Also is the steel fuel line rusted very badly any where? I doubt that either are sucking air since it only happens when hot outside but runs OK otherwise .... usually if a line is open or hose cracked it just sucks air and she doesn't run.
Just out of curriosity, did you replace the short rubber line from fuel tank to steel fuel line? It's back near front center of fuel tank above axle on top of fuel tank. Also is the steel fuel line rusted very badly any where? I doubt that either are sucking air since it only happens when hot outside but runs OK otherwise .... usually if a line is open or hose cracked it just sucks air and she doesn't run.
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The line is steel form engine to about halfway back if I remeber correctly. There was a electric pump hooked up before but it wasn't getting any power when I bought it. The owner before me swapped engines and i don't know what all he did to the fuel system but am thinking that the electric pump was on there before he got it. But I believe the lines in the back are rubber.
Hotshot
Joined: Feb 2004
Posts: 10,808
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From: The Shenandoah Valley
If it was mine, I'ld make sure of the integrity of the fuel system from tank forwards and check the pressure of my fuel pump then. He shouldn't have needed an electric pump.
I used 3/8 steel brake line sections (double flared) and unions and tube bender and remade my lines from the tank forwards to near the fuel pump. I used a double flare die to do the first step of a double flare at the ends where I was slipping hose on and clamping, just to creat a bulge. I reused the stock clips. (my original line was rusty and near breaking in the rear). Replace rubber short section at tank and at fuel pump.
Mine had 3/8 steel line on it, yours could have 5/16"? Use what it has. I would not want several feet of old rubber under the rear though.
Make sure your pump is pumping at proper 6-7 psi pressure.
I used 3/8 steel brake line sections (double flared) and unions and tube bender and remade my lines from the tank forwards to near the fuel pump. I used a double flare die to do the first step of a double flare at the ends where I was slipping hose on and clamping, just to creat a bulge. I reused the stock clips. (my original line was rusty and near breaking in the rear). Replace rubber short section at tank and at fuel pump.
Mine had 3/8 steel line on it, yours could have 5/16"? Use what it has. I would not want several feet of old rubber under the rear though.
Make sure your pump is pumping at proper 6-7 psi pressure.
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