Ford Fuel Pump Pressures--In tank pump - Hot Rod Forum : Hotrodders Bulletin Board
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Old 06-26-2011, 02:30 PM
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Ford Fuel Pump Pressures--In tank pump

Some time ago, last December, my 59 ran out of fuel with about 8 gallons left in the tank.
Just now getting around to investigating, and first thing I did was turn the key on to see if any fuel would come up to the carb.
I have one of those clear fuel filters, and lo and behold----no fuel.

Drop the tank, dink around with things for a bit, check pump filter, etc.
put the pump back in the tank, and now it is pumping fuel to the front of the car.

Connect the line to the carb to check to see if there is a blockage in the return---nope---fuel pumps to the carb and back to the tank.

HOWEVER

I only have about 3 lbs pressure in the line and it will not adjust any higher
Since this is a TBI pump, shouldn't be able to provide at least 20lbs pressure??

The bypass regulator (adjustable from 3-60) only shows 3lbs and I cannot get it up to 5.

Cannot really recall exactly what application of pump I put back there.

So---ya think the pump is going boobies up??

Hate to put it all back together just to have it peter out again down the road, besides, I'm pretty sure I need to set the regulator between 5-6 lbs

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Old 06-26-2011, 02:40 PM
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there were 2 different ford TBI systems in the 80s ( I presume thats the vintage system you are running) one was a 13 - 14 PSI system and one was a high pressure system, like 40-50 ish (dont remember exactly) they didnt use them but for a few years, 3 pounds isnt enough for either( I am sure you figured that much)
I dont recall the nomenclature they annoted them with, It went something like Central pointInjection(Hi press I think) and TBI -low pressure.
Sorry for the ambiguity,hope this helps.
I have the spec sheet at work for the pressure depending on the system , I can check it tommorow if need be.

Last edited by latech; 06-26-2011 at 02:54 PM.
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Old 06-26-2011, 02:40 PM
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Did you check the hose at the top of the pump that connects to the hard line? Mine got a split in it and it would fill the line with fuel but it wouldn't generate any pressure.
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Old 06-26-2011, 03:10 PM
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It is common for the short piece of rubber line in the tank to split and leak. Check the fuel pressure at the tank. If it is bad the issue is in the tank. Also check the grounding at the tank for the pump. If there is a bad connection you will have low voltage and low pressure. I would take a meter and go from the pump feed to the pump ground and see what voltage you have. Should be very close to battery voltage
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Old 06-26-2011, 06:29 PM
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Okay
Went and bought a new pump
Airtex #E 2484
Application is for various Ford products to 91
Napa website gave the attributes as 5-8 lb pressure.

This particular pump would only give me 5lbs.

So----anyway, long ago when I was assembling the car, I bought an electric inline pump and actually installed it to a rear x-member for emergency situations.

When I put the tank back in, I went ahead and hooked the second inline pump up and now I am back to about 7lbs.

Now the question is----what is the limit for an Edelbrock carb.
is it 7?? or now do I have to back off the regulator a bit.

With just the in-tank pump, little to no fuel was returning to the tank, but with both pumps working now, I am getting a pretty good flow back to the tank. I'm thinking this is good, so as not to load up the pumps and to keep cooler fuel going to the carb.

is 7 to much for the carb???
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Old 06-26-2011, 06:57 PM
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It sounds like you have the low psi intank delivery pump for the ford EFI that has the frame mounted high pressure pump.I wasnt aware they would make that much pressure.They used them on pickups and vans mostly IIRC.
Seems to me that particular intank pump only delivered 1-2 lbs pressure.It was only used to push the fuel to the high pressure pump. Should work good for how you have your system configured.
I would think 5- 5 1/2 Lbs. would be about all you want.
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Old 06-26-2011, 07:32 PM
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Okay
I'll crawl back under the car tomorrow and adjust it down a bit.

The regulator is on the return line back by the tank and I just set the car back down on all 4s

No leaking and no blubbering as of yet, but I thought 7 might be a bit high.
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Old 06-27-2011, 03:18 AM
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How is the regulator on the return line restricting flow to the carburetor?

It should be as close to the carburetor as possible and on the main feed line. On both of mine the regulators are no less that 2 feet from the carburetors.
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Old 06-27-2011, 09:10 AM
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BYPASS regulator.
Not restricting flow at all-----just pressure.

If I have 6lbs pressure on the return line---I have 6lbs on the feed.

Been working just fine for 5 years now, and I just realized that I was using a pump from the junkyard---so I cannot be too upset that it failed.

My second inline pump is capable of about 30lbs----waaay too much for a carb.

Another reason for having the regulator at the rear on the return---is to not clutter up the engine bay. This car is not a serious hi performance car---just a cruiser with "wheaties"

My return line is virtually invisible----runs back down the rear of the engine and bell housing.
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Old 06-28-2011, 02:56 AM
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Even if you mount the pressure regulator in the back it still needs to be on the feed line between the fuel pump and the carburetor.
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