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flathead electric fuel pump
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HT
User
May 11, 2013, 3:17 AM
Post #26 of 37
(1251 views)
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Re: flathead electric fuel pump
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No, that doesn't explain anything. As I have said numerous times. if the pump isn't running, it is not receiving the full 6v power supply it requires and something is interrupting that. Your testing is flawed somewhere and these amp tests of yours can't be done correctly. You cannot read amperage by simply contacting a probe to a wire. The wire has to be interrupted and all the current has to pass through the meter or you have to be using an inductive probe or you aren't reading amps.
I don't know where DS got that wiring diagram or if your system is anything close to that design but if it is, the oil pressure switch or relay could be what's interrupting it.
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
May 11, 2013, 5:30 AM
Post #27 of 37
(1244 views)
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Re: flathead electric fuel pump
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Probably me missing something. If it pumps on acc. position and not on run position anymore without much for testing that suggests the switch right at a dash key is the problem right now. IDK what failsafes ever were put in to this critter and don't think it's on a relay but can't know,
T
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motobobby
User
May 11, 2013, 10:14 AM
Post #28 of 37
(1237 views)
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Re: flathead electric fuel pump
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I sure don't mean to be obstinate,but how can the switch be bad when everything else connected to it is working perfectly - even accessories connected to the same post ( when I have the pump on acc. post)?The car starts, gauges work and the post shows 6-volts and I have 6-volts at the pump when the car is running and yet the pump stops. What am I missing?
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HT
User
May 11, 2013, 10:33 AM
Post #29 of 37
(1221 views)
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Re: flathead electric fuel pump
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We're just spinning our wheels here and running in circles. You have your own misunderstanding of things and we are getting nowhere because you aren't listening to what you're being told.
I just want to remind you that the run position of the switch and the start position are entirely different circuits and just because one works doesn't mean the other does.
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motobobby
User
May 11, 2013, 10:37 AM
Post #30 of 37
(1216 views)
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Re: flathead electric fuel pump
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It seems to me that the run position and the start position are one in the same-this is a 49 merc which has a starter button used while the key is in the run position.
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motobobby
User
May 11, 2013, 11:00 AM
Post #32 of 37
(1193 views)
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Re: flathead electric fuel pump
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Sounds like you're getting as frustrated as I am! I connect the pump to the acc. post, the pump runs in that key position ,but cuts out when the car starts. If on the start post, the pump runs when the the key is in that position and stops when the car starts.There are no relays or pressure switches in this circuit-I didn't want to use them for fear they would complicate the situation. The manufacturer offers my hookup as an option if you want to eliminate them. I have used the same pump for years, hooked up the same way, but when my pump started acting up as stated ,I bought a new one which is acting the same way.
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HT
User
May 11, 2013, 11:07 AM
Post #33 of 37
(1187 views)
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Re: flathead electric fuel pump
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Do you have your generator somehow hooked up backwards to it reduces the current flow when running.
Nothing has changed from my original answer. If the pump doesn't run, the power is not reaching it so find out why.
Something is robbing current from that fuel pump feed.
(This post was edited by HT on May 11, 2013, 11:08 AM)
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motobobby
User
May 11, 2013, 11:15 AM
Post #34 of 37
(1181 views)
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Re: flathead electric fuel pump
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I'll re-check that, but it charges really well and the battery is always up,even after weeks of sitting idle. The ammeter reacts well if the battery is a bit low and returns to center after a short run at speed. I don't think it's that. Please remember that when I hook the same wire to the pump directly to the battery, the pump functions perfectly, which I have to think eliminates any problem with the pump.Even I know enough about electrical issues to know that this sounds crazy, but somewhere there is a logical explanation for this problem.
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HT
User
May 11, 2013, 11:53 AM
Post #36 of 37
(1167 views)
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Re: flathead electric fuel pump
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I can see you have an answer for everything and you aren't listening to anything you're being told so I'm pretty much done here. We're just running in circles.
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motobobby
User
May 11, 2013, 12:23 PM
Post #37 of 37
(1156 views)
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Re: flathead electric fuel pump
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Sorry you feel that way - I'm just trying to let you know what I've determined on my end, i.e., when you tell me my switch has three positions , I feel I would be remiss not to inform you that it only has two. Know that I've acted on all your suggestions and none has led to a solution - but thanks for the effort.
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