Decided I can get more reliable information from a forum than a Haynes manual. So, does my 1985 F150 with a 4.9L, 3 speed manual and single tank have an electric fuel pump in the tank? Should I be able to draw fuel from the tank from the fuel line at the mechanical fuel pump? My Oreillys says there is mention of one in there system but according to thier website it is aftermarket. I don't want to drop the tank if I don't have too.

 

bump for ya.

 

We had an '82 4.9l with a carb. that didn't have one. If you're having problems getting fuel and the pump is good, try taking the gas cap off and blowing some compressed air in the tank. There may be a blockage. Not 100% sure but another engine offered that year was probably fuel injected and would require the in tank pump. I assume yours has a carb right?

 

I got the single barrel carb and only two wires going to the top of the tank which I am assuming are for the fuel level sending unit. I tried the old air in the tank thing and it blew the vent line plug off the top. I used my personal siphoning device to pull the fuel through the line to the mechanical pump. Still when I took the fuel pump output off no fuel passed through. I am pretty positive the mechanical fuel pump is trash. If I am not mistaken the fuel injected models were propane.

 

Back at ya

 

Only two wires going into the tank equals no in tank pump. The 85 carb'd 4.9 should only have the mechanical pump on the engine. Make sure the eccentric on the cam is not worn or loose. Mechanical pumps are cheap to buy at parts stores. $30.00 to $40.00 sounds about right.

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Thanks for confirming my thoughts. $22.99 at Oreillys. Monday morning it is coming off the lift and heading down the road.

 

I can't believe the answers I'm reading. It sure looks
like to me not many have a clue how to tell if they
have a old style fuel pump or electric pump in the
fuel tank..

TimC, if you have a carbed engine you'll see a gas line
hooked to it. Follow that line. If that line is hooked to
a odd looking unit on the side twords the front of the
engine, that is your fuel pump. It's cam shaft driven.
Another line from that pump goes all the way back to
the gas tank.

If you have a fuel injected or the first generation injected
system called "throtle body" (looks somewhat like a carb),
the fuel pump is in the gas tank.. A throtle body system
also has a gas line hooked to it but that line goes all the
back into the gas tank. There may be a fuel filter within
that line also... Most times it will be a solid line in/out on
the filter because of the higher pressure pump system in
the gas tank runs.

Good luck

 

Please enlighten us to what misinformation was given.

Regards

Jean Marc Chartier

 

Wow thanks for the awesome help. You guys sure are full of yourselves. Not the place for me. Laters!!