fuel pump
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Senior User
Joined: Jan 2005
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From: in the middle of nowhere
fuel pump
i bought my truck after the engine was modified. it has a 460 bored, balanced and blueprinted, with a low-end RV cam and long tube headers. it has the 2 tanks, and 3 electric fuel pumps (dont ask me why.) and i think the manual fuel pump is going out. if i have a completely full tank, then the truck runs fine, but once it gets past 3/4 of a tank, then i have to turn one of the electric fuel pumps on. does that sound like it could be the manual fuel pump on the engine block? and if it is, should i get a performance fuel pump? or stock. i think if i got the stock one, maybe it's not getting enough fuel to it. im not sure. it has the stock Holley carb on it. what do you guys think? thanks.
-Todd
-Todd
Elder User
Joined: Feb 2005
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Todd,
Are the 3 electric pumps between your tank and the manual pump? Maybe there is too much restriction to allow your manual to pick the fuel up if so. Try buying a piece of fuel line and bypassing the electric pumps to see if you still have the same problem.
Good Luck,
Ernie
Are the 3 electric pumps between your tank and the manual pump? Maybe there is too much restriction to allow your manual to pick the fuel up if so. Try buying a piece of fuel line and bypassing the electric pumps to see if you still have the same problem.
Good Luck,
Ernie
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Joined: Apr 2005
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[QUOTE=GreenSubmarine]Todd,
Are the 3 electric pumps between your tank and the manual pump? Maybe there is too much restriction to allow your manual to pick the fuel up if so. Try buying a piece of fuel line and bypassing the electric pumps to see if you still have the same problem.
YOU COULD ALSO USE THE PIECE OF HOSE AND JUMP AROUND THE MANUAL PUMP SINCE YOU ALREADY HAVE THE EXTRA PUMPS. I DONT THINK YOU WOULD HAVE TO HAVE THE MANUAL. ANY WAY IT WOULD BE CHEAPER.
Are the 3 electric pumps between your tank and the manual pump? Maybe there is too much restriction to allow your manual to pick the fuel up if so. Try buying a piece of fuel line and bypassing the electric pumps to see if you still have the same problem.
YOU COULD ALSO USE THE PIECE OF HOSE AND JUMP AROUND THE MANUAL PUMP SINCE YOU ALREADY HAVE THE EXTRA PUMPS. I DONT THINK YOU WOULD HAVE TO HAVE THE MANUAL. ANY WAY IT WOULD BE CHEAPER.
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Senior User
Joined: Jan 2005
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From: in the middle of nowhere
i have no clue why he put the electrics in. i try to not run the electric pumps, because when i do, there is a leak where the hose goes to the manual pump. i dont think i want to put oa block off plate on it, because then i would have to run the electric pumps. i only use the electric pumps if im running low on gas, because it wont run if i dont have at least one pump.
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Joined: Nov 2004
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From: Asheville, NC
Maybe at one time, someone was having trouble figuring out why one of the tanks kept running dry, and didn't want to replace the tank-switching valve due to its high price. I think you need to remove a threesome of pumps, and go with the original style, and a tank switching valve. Looks like major overkill here, Red.
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From: in the middle of nowhere
well, im since i hardly have enough money to put gas in the tanks, im not going to do anything right now that isn't necessary, im just trying to figure out if maybe my manual fuel pump is going bad. if my manual fuel pump is going out, then i will replace it, but if not, then i will do what i need to do until i have the time and money to fix it.
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Posting Guru
Joined: Nov 2004
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From: Asheville, NC
With the 3 pumps, you may have more resistance in the fuel lines than the manual pump can overcome. Thats why you have to run these electrics. You could disconnect one tank, and plug the lines. I have a feeling that the manual pump will work just fine. Even if you do have to replace the manual pump, it will cost alot less than those electrics do, Red.
My '83 has dual tanks, a 351W, and all the hardware for proper plumbing. I just replaced the OEM pump with a dealer-stock replacement--got it for free from a pal that used to work for Ford-- and the only reason I replaced it was that the original had 165,000 miles on it.
Dont feel alone with high gas prices. My truck is averaging 5 mpg right now. I'm having to replace my carb, and intake to cure some of my problems. I'd love to have a 460 in my truck, but in these days of insane oil company profits, I'll stick with the 351. At least, its not a 302...
Let me know what you do.
EDIT: PS: Fix the leak at the original pump. You dont want fire. Fire and a Ford are not a good mix.
My '83 has dual tanks, a 351W, and all the hardware for proper plumbing. I just replaced the OEM pump with a dealer-stock replacement--got it for free from a pal that used to work for Ford-- and the only reason I replaced it was that the original had 165,000 miles on it.
Dont feel alone with high gas prices. My truck is averaging 5 mpg right now. I'm having to replace my carb, and intake to cure some of my problems. I'd love to have a 460 in my truck, but in these days of insane oil company profits, I'll stick with the 351. At least, its not a 302...
Let me know what you do.
EDIT: PS: Fix the leak at the original pump. You dont want fire. Fire and a Ford are not a good mix.
Last edited by Holmesuser01; May 3, 2005 at 06:40 AM.
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Joined: Apr 2005
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From: Mobile, Alabama
I, too, have to wonder why somebody installed three electric fuel pumps. I have a 1980 F-350 4X4 400 automatic that came from the factory with a manual fuel pump bolted to the engine block. That set up worked fine in Virginia and Maryland, but when I moved to Utah and started towing heavy boats at high altitude, it was time to install ONE electric Carter fuel pump downstream of the dual tanks where the fuel lines merge. I run with the electric pump all the time pumping through the mechanical pump with a fuel pressure guage controlling pressure between the mechanical pump and the carb. I installed that set up in 1986 and it has performed quite well for 19 years now.
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From: in the middle of nowhere
the previous owner of this truck built it for his wife. she did a lot of towing with a campershell and 4-horse bumper-pull trailer. and she took this thing everywhere. with the 460 in my truck, modified and all, i'm getting about 3 or 4 mpg. plus i drive with a heavy boot. 5 with a 400 is pretty bad. is it modified?
Senior User
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From: Mobile, Alabama
5 MPG from a 400 with 4.10 gears hauling a 10,000 pound boat and trailer at high altitude seems par for the course with the only engine mod being an RV cam. I wish my cruiser could beat the 2 MPG barrier.
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Senior User
Joined: Jan 2005
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From: in the middle of nowhere
i have the RV cam in my truck also. did you have to change the stall converter with that cam? cuz the previous owner didnt, and sometimes my truck runs a little wierd, and i wonder if thats it. wat do u think?