fuel pump????
Thread Starter
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Freshman User
Joined: Mar 2007
Posts: 35
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From: Chaplin, KY
fuel pump????
So yesterday I went to take the carburetor off so I could remove that rusted off tube that runs from the EGR plater to the AIR pump, and when I broke the fuel line loose, it just kinda sagged, I figured it should have been held in place, being a bent steel line from the fuel pump to the carb.
So I lean over to have a look, and guess what? No fuel pump on the side of the engine! the line just runs down, into a rubber line, then back to steel and disappears down the frame rail.
I'm scratching my head... 1984 4.9L supposed to have mechanical fuel pump, right?
According to all the auto parts store websites it is, but apparently mine's not.
What gives? electric fuel pump on a carbed truck? Or just some weird mid-year change hybrid?
Looks like it ain't gonna be fun if I ever have to buy a pump.
Any ideas/answers?
Thanks, Joe
So I lean over to have a look, and guess what? No fuel pump on the side of the engine! the line just runs down, into a rubber line, then back to steel and disappears down the frame rail.
I'm scratching my head... 1984 4.9L supposed to have mechanical fuel pump, right?
According to all the auto parts store websites it is, but apparently mine's not.
What gives? electric fuel pump on a carbed truck? Or just some weird mid-year change hybrid?
Looks like it ain't gonna be fun if I ever have to buy a pump.
Any ideas/answers?
Thanks, Joe
Moderator
Joined: Nov 2007
Posts: 22,415
Likes: 92
From: Denver Metro Area, CO
Assuming you ARE supposed to have a mechanical pump, probably a previous owner
changed to an electric pump. Crawl under there and trace all the tubes and wires and see
where they go to determine what you have; there's no end to the mods that have been
made by people on these things over the course of 25-30 years.
changed to an electric pump. Crawl under there and trace all the tubes and wires and see
where they go to determine what you have; there's no end to the mods that have been
made by people on these things over the course of 25-30 years.
pedant
Joined: Jan 2008
Posts: 23,576
Likes: 40
From: EXTREME southwest CT
Certainly you need a flexible connection between the engine and chassis.
Lots of 460's have electric pumps and a carburetor. It's known as the 'hot fuel handling' option and circulates fuel past an orifice that returns fuel to the tank.
This is an effort to reduce vapor lock.
Sorry, I don't know much about I-6's other than they are torquey, have timing gears and seem to last forever....
Cargo Master
Joined: Mar 2008
Posts: 2,573
Likes: 207
From: Washington
I'm scratching my head... 1984 4.9L supposed to have mechanical fuel pump, right?
According to all the auto parts store websites it is, but apparently mine's not.
What gives? electric fuel pump on a carbed truck? Or just some weird mid-year change hybrid?
Looks like it ain't gonna be fun if I ever have to buy a pump.
Any ideas/answers?
Thanks, Joe
According to all the auto parts store websites it is, but apparently mine's not.
What gives? electric fuel pump on a carbed truck? Or just some weird mid-year change hybrid?
Looks like it ain't gonna be fun if I ever have to buy a pump.
Any ideas/answers?
Thanks, Joe
<O
</ODo you have dual tanks?
The electric fuel tank selector is on the frame rail just forward of the front tank, which would be a good point to mount an electric fuel pump, on the output of the selector.
Jim
Thread Starter
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Freshman User
Joined: Mar 2007
Posts: 35
Likes: 0
From: Chaplin, KY
The change occurred in 87 with the change to EFI. The EFI blocks cast over the hole where the fuel pump mounted, so no hole for the fuel pump would mean an EFI block.
<O</O
Do you have dual tanks?
The electric fuel tank selector is on the frame rail just forward of the front tank, which would be a good point to mount an electric fuel pump, on the output of the selector.
Jim
<O
</ODo you have dual tanks?
The electric fuel tank selector is on the frame rail just forward of the front tank, which would be a good point to mount an electric fuel pump, on the output of the selector.
Jim
Hard to tell if the F/P hole is blocked off, or just has a plate covering it, that monstrosity that holds the TFI coil is bolted right there. I'll get a pic.
pedant
Joined: Jan 2008
Posts: 23,576
Likes: 40
From: EXTREME southwest CT
So now the question is how did the P.O. wire it into the older harness and did he scavenge the factory pump setup from the donor truck...
Great pic's BTW. I'm really interested in learning about how all these trucks were set up.
Thanks.
Great pic's BTW. I'm really interested in learning about how all these trucks were set up.
Thanks.
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Moderator
Joined: Nov 2007
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From: Denver Metro Area, CO
Factory shop manuals are GREAT for that.
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pedant
Joined: Jan 2008
Posts: 23,576
Likes: 40
From: EXTREME southwest CT
I have some on CD but it's just not as rewarding looking at a screen as it is when you're out under your truck thumbing through grease stained pages.
