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Author Topic:   Fuel Delivery Issues (long)
2bav8
Esteemed Member

Posts: 145
From:Scottsdale, AZ
Registered: Jun 99

posted 09-21-2000 04:45 PM     Click Here to See the Profile for 2bav8   Click Here to Email 2bav8     Edit/Delete Message   Reply w/Quote
Well, Kingsford made it to CA (and back!)this week end no problem. I never did change my old fuel pump either. I bought the new Holley pump and was going to install it decided to give the old Mallory pump a good hit. Well, it started to work again.

Of course, because I didn't trust the thing on a 900 mile trip I brought the Holley pump and all the tools to replace should it be needed.

Now, here's the one thing that gave me a good scare when I was out in CA. When I get to just below tank of fuel, my Autometer fuel pressure guage drops to 0 PSI (Fuel pump is still running), even though I have 6-8 gallons of fuel left in the tank! I top the tank off, and I get fuel pressure again. Because I didn't want to get stuck in the middle of nowhere, I never pushed the issue and kept plenty of gas in the tank (3 gas tops per direction).

Now that I'm back in town, I don't have a problem driving the car to see if it
"really" runs out of gas or not, I just want to make sure I'm close to a gas station of course.

Just curious if anybody has ever seen something like this before...

Hey Zonie, nice meeting you last Saturday night!

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2BAV8 Racing
www.geocities.com/2bav8
[email protected]
1966 Restomod Coupe

IP: 172.136.129.36

steve'66
Esteemed Member

Posts: 865
From:Sonoma,CA,USA
Registered: Mar 2000

posted 09-21-2000 05:10 PM     Click Here to See the Profile for steve'66   Click Here to Email steve'66     Edit/Delete Message   Reply w/Quote
2bav8,

Is your fuel pump mounted below the tank, or at about the half tank level? It could be loosing prime when the gas level drops below the pump. The new Holley may prime easier than your old Mallory.

SteveW

IP: 152.163.205.12

2bav8
Esteemed Member

Posts: 145
From:Scottsdale, AZ
Registered: Jun 99

posted 09-21-2000 06:10 PM     Click Here to See the Profile for 2bav8   Click Here to Email 2bav8     Edit/Delete Message   Reply w/Quote
The fuel pump is mounted lower than the gas tank. Its been there for 7 years...
I wonder if the pump (in its dying stages) is losing its ability to suck in fuel from the tank. With less gas in the tank, wouldn't there be less pressure?

I Probably should just install the Holley pump and see what happens. I have an Auto-X event on Saturday, and I need the car running well!

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2BAV8 Racing
www.geocities.com/2bav8
[email protected]
1966 Restomod Coupe

IP: 166.62.152.10

steve'66
Esteemed Member

Posts: 865
From:Sonoma,CA,USA
Registered: Mar 2000

posted 09-21-2000 06:27 PM     Click Here to See the Profile for steve'66   Click Here to Email steve'66     Edit/Delete Message   Reply w/Quote
That could be it, go ahead and try the holley. Check the fuel flow (gravity) while you've got the line from the tank disconnected, by letting some gas run into a pan. It sould run out freely.

SteveW

IP: 152.163.205.15

kcode
Esteemed Member

Posts: 808
From:alvaton,ky,usa
Registered: Jun 99

posted 09-21-2000 11:21 PM     Click Here to See the Profile for kcode   Click Here to Email kcode     Edit/Delete Message   Reply w/Quote
It sounds like the old Mallory's impellors or vanes are wore down enough that it doesn't have enough "sucking" power to lift the fuel from the tank. Years ago I had an old Stewart Warner pump that did that if the car was on an incline, pumped like crazy if the fuel was there. I agree with Steve, put the Holley on and not have to worry about it.

Mike

IP: 63.39.119.207

m69460
Esteemed Member

Posts: 72
From:ny
Registered: Jun 99

posted 09-25-2000 08:52 PM     Click Here to See the Profile for m69460   Click Here to Email m69460     Edit/Delete Message   Reply w/Quote
Does it have foam...Well my friend had one where the foam somewhat came apart sticks etc.. checking fuel, it tore it whatever and erratically would do what youre saying even at 3/4 tank and to this day still baffles me cause when we took it out all worked fine...
Longshot but ya never know.....M69....FORD..

IP: 205.188.198.54

Moneymaker
Big Kahuna

Posts: 4655
From:Lyons, IL, USA
Registered: May 99

posted 09-26-2000 12:56 PM     Click Here to See the Profile for Moneymaker   Click Here to Email Moneymaker     Edit/Delete Message   Reply w/Quote
Simple test. Disconnect the fuel line from the carb and place it into a container that will hold at least one gallon. Get a watch and turn on the pump. You should be able to pump 1 gallon in less than 30 seconds. If not, the pump is a dead player. Alex

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Alex Denysenko Co-Administrator and Moderator
Fleet of FoMoCo's too long to list!
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