Fuel Pump question
#1219842
04/21/12 05:30 PM
04/21/12 05:30 PM
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Joined: Mar 2006
Posts: 2,675 Mt. Eden Ky.
Hemi Allstate
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Mt. Eden Ky.
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Guys, I got a little bad information when building my car. I have always mounted the electric pump lower than the fuel tank so it would gravity feed. I was told that was not necessary any more! SO, I mounted mine in the trunk. Now, it will not self prime and draw from the tank. It is a BG 220 HR. My question is... Is there an electric pump, that will draw fuel up from the tank? Is a gear rotor pump capable of this? Thanks, Mark
1996 Ram 1500 Sport 1968 road runner 1952 Sears Allstate licensed, pump gas, Hemi 5.98 @ 115.73 1.33 60 ft. The best is yet to come. Painless Performance / Street RODDER magazine Top 100 for 2019
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Re: Fuel Pump question
[Re: smokinwoody]
#1219849
04/21/12 11:00 PM
04/21/12 11:00 PM
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Joined: Mar 2006
Posts: 2,675 Mt. Eden Ky.
Hemi Allstate
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when I start plumbing my Dodge, Im going to put a fuel shut off valve right at the tank...if you did that, the fuel will stay in the line rather than drain back...also a check valve may work in that line going forward.. the culprit is that fuel line going up and over the tub.....
Jeff, I did an experiment today. I took the top off the filter, and filled it to the inlet of the pump and put the filter back in. It ran and primed, just fine. 4 hrs. later it had lost prime. This is with a new check valve between the tank and filter. I have tried removing the blue cap on the pump, and poured fuel in there and it will not prime the pump, or hold the fuel.
1996 Ram 1500 Sport 1968 road runner 1952 Sears Allstate licensed, pump gas, Hemi 5.98 @ 115.73 1.33 60 ft. The best is yet to come. Painless Performance / Street RODDER magazine Top 100 for 2019
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Re: Fuel Pump question
[Re: RobbMc]
#1219853
04/22/12 12:17 PM
04/22/12 12:17 PM
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Joined: Mar 2006
Posts: 2,675 Mt. Eden Ky.
Hemi Allstate
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It would be best if the pump was no higher than the tank. Having said that, if you must mount the pump higher, you'll have better luck with a gerotor style pump because the internal clearances are tighter so it will "suck" (prime) better (at least until the pump has substantial internal wear). However, the same tight clearances that make gerotor pumps prime better also makes them more susceptible to debris. Use a large 40 micron filter before a gerotor pump.
Robb, This is what I was thinking. The oil pump in in the BBM engines are gerotor type, and they pull oil up from the pan which is of course lower.
I want to look at all options, before making a change. The tank is 12" tall, 7.5" is level to the pump inlet. So I guess for now if I keep the tank/cell filled above that I will not have to reprime the pump!?!? Thanks for your input, Mark
1996 Ram 1500 Sport 1968 road runner 1952 Sears Allstate licensed, pump gas, Hemi 5.98 @ 115.73 1.33 60 ft. The best is yet to come. Painless Performance / Street RODDER magazine Top 100 for 2019
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Re: Fuel Pump question
[Re: Hemi Allstate]
#1219856
04/22/12 01:52 PM
04/22/12 01:52 PM
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Joined: Jan 2003
Posts: 961 Carson City, Nevada
RobbMc
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super stock
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Carson City, Nevada
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Quote:
Quote:
not looking at ur car in person, can u raise ur cell up higher?? i have a mallory g-rotor pump, directions state pump must below sump or level with it. that maybe an option.
I don't think I can raise it enough to help. Also, it is enclosed in steel on the sides, and the outlet passes through it. I am glad you told me about your Mallory, as that is one I am considering.
Mark
I helped write the Mallory instructions. Yes, it is better if the pump can be gravity fed. It avoids a lot of customer phone calls with problems. For instance, if there is even a tiny leak in the line between the tank and the pump, the pump may not prime (ever try to suck through a straw with a hole in it?). Also, as the pump gets older, it doesn't suck as well. So, to be safe, it is better to have the pump gravity fed. Still, the Mallory gerotor pump will prime a lot better than the BG pump. When I was testing BG pumps on the bench many years ago, I found that the pump would only prime if it was placed on the floor below the fuel storage tank we had mounted on the bench. New Mallory pumps would prime even if 2 or 3 feet above the tank. Of course, BG pump design may have changed since then, but this is my experience.
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Re: Fuel Pump question
[Re: Hemi Allstate]
#1219857
04/22/12 02:00 PM
04/22/12 02:00 PM
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Joined: Jan 2003
Posts: 961 Carson City, Nevada
RobbMc
super stock
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Carson City, Nevada
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Quote:
It would be best if the pump was no higher than the tank. Having said that, if you must mount the pump higher, you'll have better luck with a gerotor style pump because the internal clearances are tighter so it will "suck" (prime) better (at least until the pump has substantial internal wear). However, the same tight clearances that make gerotor pumps prime better also makes them more susceptible to debris. Use a large 40 micron filter before a gerotor pump.
Robb, This is what I was thinking. The oil pump in in the BBM engines are gerotor type, and they pull oil up from the pan which is of course lower.
I want to look at all options, before making a change. The tank is 12" tall, 7.5" is level to the pump inlet. So I guess for now if I keep the tank/cell filled above that I will not have to reprime the pump!?!? Thanks for your input, Mark
Correct. If you keep the level of the fuel in the cell higher than the inlet of the pump, it should prime.
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Re: Fuel Pump question
[Re: RobbMc]
#1219858
04/22/12 03:22 PM
04/22/12 03:22 PM
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Joined: Mar 2006
Posts: 2,675 Mt. Eden Ky.
Hemi Allstate
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master
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OP
master
Joined: Mar 2006
Posts: 2,675
Mt. Eden Ky.
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Quote:
Quote:
It would be best if the pump was no higher than the tank. Having said that, if you must mount the pump higher, you'll have better luck with a gerotor style pump because the internal clearances are tighter so it will "suck" (prime) better (at least until the pump has substantial internal wear). However, the same tight clearances that make gerotor pumps prime better also makes them more susceptible to debris. Use a large 40 micron filter before a gerotor pump.
Robb, This is what I was thinking. The oil pump in in the BBM engines are gerotor type, and they pull oil up from the pan which is of course lower.
I want to look at all options, before making a change. The tank is 12" tall, 7.5" is level to the pump inlet. So I guess for now if I keep the tank/cell filled above that I will not have to reprime the pump!?!? Thanks for your input, Mark
Correct. If you keep the level of the fuel in the cell higher than the inlet of the pump, it should prime.
Robb,
Does the Mallory pump use a return line? Which pump would I use for this application? Thanks, Mark
1996 Ram 1500 Sport 1968 road runner 1952 Sears Allstate licensed, pump gas, Hemi 5.98 @ 115.73 1.33 60 ft. The best is yet to come. Painless Performance / Street RODDER magazine Top 100 for 2019
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Re: Fuel Pump question
[Re: RobbMc]
#1219861
04/25/12 11:15 AM
04/25/12 11:15 AM
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Joined: Mar 2006
Posts: 2,675 Mt. Eden Ky.
Hemi Allstate
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For instance, if there is even a tiny leak in the line between the tank and the pump, the pump may not prime (ever try to suck through a straw with a hole in it?). Well, thanks to an observant friend that noticed fuel seeping out from the fitting between the filter and the pump, we have found the problem! We removed the pump and filter and sealed the fitting (pipe threads) with teflon tape. I had to prime the pump by filling the filter again, but as of this AM the pump has not lost prime! Thanks, Mark
1996 Ram 1500 Sport 1968 road runner 1952 Sears Allstate licensed, pump gas, Hemi 5.98 @ 115.73 1.33 60 ft. The best is yet to come. Painless Performance / Street RODDER magazine Top 100 for 2019
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