Re: Can I run a mechanical and electric fuel pump?
[Re: VITC_GTX]
#74269
06/16/08 12:31 AM
06/16/08 12:31 AM
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Anonymous
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Anonymous
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Re: Can I run a mechanical and electric fuel pump?
[Re: VITC_GTX]
#74274
06/16/08 01:00 AM
06/16/08 01:00 AM
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Joined: Feb 2004
Posts: 4,501 Gainesville,FL
goldmember
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master
Joined: Feb 2004
Posts: 4,501
Gainesville,FL
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Insulating the fuel line(steel lines?) can be a big help. There used to be an aluminum heat deflector(thin) that the GM dealer sold for the 69 Z/28 (holley carb)that can possibly be a help. Jegs might have the same type piece. Jegs PN 510-108-70 is the same item.
Last edited by goldmember; 06/16/08 01:07 AM.
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Re: Can I run a mechanical and electric fuel pump?
[Re: goldmember]
#74275
06/16/08 01:06 AM
06/16/08 01:06 AM
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Anonymous
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I used to do this, but there are some issues. You of course should mount the electric near the tank. However, with the mechanical only, the restriction through the non-operating electric will cause a drop in the suction line, and could CAUSE vapor lock. You might be better off just running both all the time.
Your GTX is a '70? If so, you should already have the necessary vent lines to hook up a "vapor return" system like my six-pack had. I'm a HUGE believer in these. I don't remember the part no. but Wix (NAPA) should still make "universal" filters with a vapor return fitting. You simply mount the filter with the vapor return "up" and plumb the small line to a return line back to the tank.
If your car came with a tank carbon canister system, you should have a line already under there that you can "tap" into.
Also check for ANYTHING that can restrict the suction side, which will aggrevate the vapor lock condition.
Is the tank/ cap properly vented?
Are the suction hoses in good shape, and not collapsing?
Any chance the feedline is rusted, leaky?
How about the suction screen in the tank?
You should test the pump for proper suction (vacuum), pressure, and volume. Vacuum/ pressure test gauges just aren't all that expensive at any parts store.
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Re: Can I run a mechanical and electric fuel pump?
#74276
06/16/08 01:21 AM
06/16/08 01:21 AM
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Anonymous
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he said to help with a vapor lock problem.. so yah it'll work. going down the 1/4 mile it'll work. continuous use, it won't work.
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Re: Can I run a mechanical and electric fuel pump?
#74277
06/16/08 01:30 AM
06/16/08 01:30 AM
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Joined: Jan 2003
Posts: 5,275 near Harrisburg, Pa
440trk
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Joined: Jan 2003
Posts: 5,275
near Harrisburg, Pa
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Quote:
he said to help with a vapor lock problem.. so yah it'll work. going down the 1/4 mile it'll work. continuous use, it won't work.
Why would it not work for continuous use?
Running an electric to feed the mechanical is an old trick...and they worked fine under continuous use. The only problems I'm aware of is the extra noise from the electric pump and (as mentioned) if the diaphram in the mechanical fails, the electric will pump fuel directly into the crankcase.
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Re: Can I run a mechanical and electric fuel pump?
[Re: 440trk]
#74279
06/16/08 01:40 AM
06/16/08 01:40 AM
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Anonymous
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Anonymous
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Quote:
...if the diaphram in the mechanical fails, the electric will pump fuel directly into the crankcase.
bingo
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Re: Can I run a mechanical and electric fuel pump?
[Re: AlexP]
#74281
06/16/08 02:19 AM
06/16/08 02:19 AM
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Anonymous
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This scare nonsense about pumping gasoline into the pan if the mechanical pump fails is silly--because--
The mechanical pump is no more prone to fail whether you have an electric pump inline or not, and--
If the mechanical pump diaphragm ruptures, it will STILL pump gas into the pan, whether you have an electric pump or not!!! You are just as likely "not" to notice the problem, either way.
The body of my old '70, as well as my '64 Polara 426 had thousands of miles on them this way, and I never had a problem.
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Re: Can I run a mechanical and electric fuel pump?
#74283
06/16/08 09:05 AM
06/16/08 09:05 AM
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Anonymous
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there is ZIP, ZERO, & NOTTA need to run a auxillary fuel pump during normal cruising. so why take the chance? BUT hey.. do what you want.
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