Fuel from rear tank

[chiefcfd]

I installed a Blazer tank in the rear. Manual fuel pump to a 600 Edelbrock carb. My problem is that after sitting for a few days it appears the fuel line is running dry. It takes lots of cranking to get to fire up. Anyone else notice this? I have thought about some sort of one way valve to install inline.

[custom10nut]

Very good question. I'm about to do the tank relocation, and never thought about that.
Was this an inherent problem with the Balzers and Suburbans?

[chiefcfd]

Anybody got any ideas?

[Daves70]

This is common with the Edelbrock carb. I don't think it has anything to do with the tank location. My truck did it with the stock tank too.

[Shinysideup]

I suspect the fuel pump is bleeding off the fuel. I had an inline six ford that would do the same thing .

[bhemingson]

Put an electric fuel pump in line near the tank. Electric pumps push fuel not pull like a manual.put it on a separate switch and run it a few seconds before turning over engine and you will have fuel to your manual pump.

[weq92f]

You could install a check valve just behind your mechanical pump ( toward the tank ). That should keep the fuel close enough to minimize the time to prime things again.

Hth,

-klb

[ufbugman]

I have the same problem on my rear tank, planning on a electric fuel pump close to the tank turn it on by a switch and after truck starts shut it off.

[67 chevelle]

Originally Posted by Daves70

This is common with the Edelbrock carb. I don't think it has anything to do with the tank location. My truck did it with the stock tank too.

Its the carb running dry , truck should run for 30 to 45 seconds on just the fuel in the carb bowl , so yours is running dry

[chiefcfd]

Originally Posted by 67 chevelle

Its the carb running dry , truck should run for 30 to 45 seconds on just the fuel in the carb bowl , so yours is running dry

That makes sense, but it takes less than a week without being started for this to happen. I'm really thinking about an EFI kit.

[haysonj]

Originally Posted by chiefcfd

That makes sense, but it takes less than a week without being started for this to happen. I'm really thinking about an EFI kit.

You have a leak somewhere that is allowing air into the line and it siphons back to the tank. My FI pump runs about 2 sec and the truck starts on the first revolution whether on the front or back tank. My truck sometimes sits for a month between car shows.

[HO455]

After sitting and before trying to start the engine look down the primaries and wing the throttle watching for fuel being pumped in by the accelerator pump. No fuel shot could indicated no fuel or a bad accelerator pump (or possibly the check ball isn't seating). Then crack the fuel fitting at the inlet to the pump and see if fuel runs out. If not then your problem is in the line or the pump diaphragm. If you have fuel at the inlet then try the outlet. If no fuel then I would look at the fuel pump. If you have fuel at the outlet then I would say your float bowl is leaking. This is a common problem with Q-Jets but I don't know about Edlebrocks. But remember that it is perfectly normal for the fuel to evaporate out of the bowl in hot weather in just a couple of days. That is one of the reasons carbs have disappeared from new cars is that that evaporation counts against emission results in the eyes of the EPA.