302 fuel pump ????????
Thread Starter
|
Senior User
Joined: Nov 2004
Posts: 227
Likes: 1
From: Owosso Michigan
302 fuel pump ????????
I had a mechanical fuel pump with the filter built into it. Now I have a new fuel pump without the filter built into it and my fuel bleeds back into pump and into tank. Is this normal with this kind of pump? It takes 10 cranks to get the fuel up to carb to get it started. It sucks.
Michigan Rick
(I have a 54 F100 with new 302 and new pump and new,new new)
Michigan Rick
(I have a 54 F100 with new 302 and new pump and new,new new)
Cargo Master
Joined: May 2007
Posts: 2,071
Likes: 36
From: British Columbia
Those pumps should be interchangeable. It sounds like one of the disc valves in the new pump isn't sealing properly, possibly due to a bit of foreign matter.
However, even so, the carburetor fuel bowl can't drain back into the fuel line, since the needle valve is either above or close to the top of the fuel level in the carburetor. So you may have another problem, like a leaky carburetor gasket. What kind of carb is it?
I installed one of those fuel pumps with the filter built into it on my 1969 engine because that big filter can hold a huge amount of crud (like rust from an old tank) and still pass fuel. The tiny stock inline filters were regularly plugging.
Also, for those who like to fix things, these early pumps can be taken apart to replace the diaphragm when it goes.
However, even so, the carburetor fuel bowl can't drain back into the fuel line, since the needle valve is either above or close to the top of the fuel level in the carburetor. So you may have another problem, like a leaky carburetor gasket. What kind of carb is it?
I installed one of those fuel pumps with the filter built into it on my 1969 engine because that big filter can hold a huge amount of crud (like rust from an old tank) and still pass fuel. The tiny stock inline filters were regularly plugging.
Also, for those who like to fix things, these early pumps can be taken apart to replace the diaphragm when it goes.
Thread Starter
|
Senior User
Joined: Nov 2004
Posts: 227
Likes: 1
From: Owosso Michigan
Sorry.....I have a new Edelbrock 500 .....the fuel from the filter between the carb and the pump bleeds back down to the fuel pump....it's clear so I can watch it bleed back down. I crank the starter for ever to get fuel up to the carb......so I usually dump a little gas in the carb to get the fuel pumping up to carb.......it pumps forever if I don't prime it to get the fuel started...
Any ideas?
Any ideas?
Cargo Master
Joined: May 2007
Posts: 2,071
Likes: 36
From: British Columbia
Those clear filters will often retain trapped air indefinitely. This could be what is happening in your case, and the air pocket gets smaller when the fuel is pressurized by the fuel pump, then expands again when the pump stops pressurizing it.
Before starting the vehicle next time, check for fuel in the carburetor by working the throttle linkage while looking down the bores to see if fuel squirts out the accelerator pump circuit.
Before starting the vehicle next time, check for fuel in the carburetor by working the throttle linkage while looking down the bores to see if fuel squirts out the accelerator pump circuit.
Posting Guru
Joined: Oct 2009
Posts: 2,066
Likes: 4
From: Rogue River, Oregon
No matter what pump you have, there should always be a full bowl of gas in the carb after you shut the engine off, which would allow for fast startups. It should never take more than a few (2-5) pumps of the accelerator pedal to get a carbed engine started. If you're having to grind the starter to death waiting for fuel pressure something else is wrong.
Postmaster
Joined: Jan 2009
Posts: 4,558
Likes: 2
Have a good look down the carb after you shut it off , see if you see any fuel leaking into the intake ....Lew
Trending Topics
Posting Guru
Joined: Aug 2009
Posts: 2,165
Likes: 0
From: Union Lake MI
It is a good thing, it primes the oil in the engine before it fires the engine likes it the starter might not. Get a lifetime starter from Oreillys & you will have a long running engine.
Unless your washing the walls down in the cylinder bores.
A new Edelbrock can't leak the fuel out. Is it flooded? Pull a plug & see if gas is shooting out of the plug hole when you crank it/
Unless your washing the walls down in the cylinder bores.
A new Edelbrock can't leak the fuel out. Is it flooded? Pull a plug & see if gas is shooting out of the plug hole when you crank it/
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
Top 10 Most Expensive Ford Trucks Ever Sold on Bring a Trailer
Joe Kucinski
2027 Ford Super Duty Buyer's Guide (Every Model, Engine, & Package)
Brett Foote
Top 10 Ford Truck Tragedies
Joe Kucinski
AEV FXL Super Duty - the Super Duty Raptor Ford Doesn't Make
Brett Foote
Lobo Vs Lobo: Proof the F-150 Lobo Should Be Even Lower!
Michael S. Palmer
Ford's 2001 Explorer Sportsman Concept Looks For a New Home
Verdad Gallardo
10 Best Ford Truck Engines We Miss the Most!
Joe Kucinski
2026 Shelby F-150 Off-Road: Better Than a Raptor R?
Brett Foote
2027 Super Duty Carhartt Package First Look: 12 Things You NEED to Know!
Michael S. Palmer
Senior User
Joined: May 2010
Posts: 121
Likes: 0
there should be enough fuel in your floatbowl to start the engine. it will be full when you cut the engine off. take the air cleaner off and look down the carb while you push your throttle lever by hand. if it does not squrit gas into the ventury you have a carb problem. if it does squirt gas, give your peddle a couple of pumps before trying the starter.
Laughing Gas
Joined: Dec 2003
Posts: 900
Likes: 3
Another possibility may be fuel percolation, where some of the fuel vaporizes out of the carb due to engine heat after the engine is shut off. Since the fuel pump is no longer supplying fuel to the carb, the fuel level in the bowl can drop due to it evaporating, causing hard starting. My truck used to do this right after I installed an Edelbrock carb. I put a plastic 4 hole insulator between the carb and intake and have'nt had the problem since. Now it starts right up at the first twist of the key hot or cold.
Thread
Thread Starter
Forum
Replies
Last Post
tempest411
1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks
1
Oct 2, 2015 11:13 AM
dynamic
Fuel Injection, Carburetion & Fuel System
7
Aug 22, 2015 01:46 PM
tempest411
1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks
3
Aug 10, 2013 12:27 PM
