beautifully clean 87 dx manual fuel pump problem
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Joined: Mar 2007
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RE: beautifuly clean 87 dx manual fuel pump problem
and i was told i have a bad ground wire...so i got a new one but can't fallow it down thru to replace the bad one>? i dont see where i can take off the old one without splicing the wires and i know thats a BAD idea to do
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Joined: Mar 2007
Posts: 30
From:
RE: beautifuly clean 87 dx manual fuel pump problem
ORIGINAL: Hatchit
and i was told i have a bad ground wire...so i got a new one but can't fallow it down thru to replace the bad one>? i dont see where i can take off the old one without splicing the wires and i know thats a BAD idea to do
and i was told i have a bad ground wire...so i got a new one but can't fallow it down thru to replace the bad one>? i dont see where i can take off the old one without splicing the wires and i know thats a BAD idea to do
Been Around A Long Time Member
Joined: Dec 2005
Posts: 4,754
From: In The Desert ( Sahara ? )
RE: beautifuly clean 87 dx manual fuel pump problem
ORIGINAL: Hatchit
power is there all the way up to the fuse box.... it cecks out all the way thru..... and what i was trying to say is that (when he cars on) it pumps nothing.... but just to check the pumps operation i used a 9 volt to see if it's a abd pump.... it's not the pump..... and i by passed the relay.. and the pump ran continualy but pumped nothing up.... but if i use the 9 vold i can push fuel with no problem....
ORIGINAL: deserthonda
What do you mean all the tests clear out ?? if they did, that would mean that you also have power and ground at the fuel pump connectors ?? if so, why do you need to apply another battery source to make the pump activate??? you are comtradicting yourself or i am not understanding what you said properly ..what i am getting is that .. if you need to apply another battery source , that would mean that you got either NO power or NO ground // Am i wrong ?? is there power ( 12 volts ) and ground available at the fuel pump connector??? yes or no ..
ORIGINAL: Hatchit
ok all your test clear out.(desert honda)... i can push thru with the 9 volt.... but still nothing when the cars on?
ok all your test clear out.(desert honda)... i can push thru with the 9 volt.... but still nothing when the cars on?
power is there all the way up to the fuse box.... it cecks out all the way thru..... and what i was trying to say is that (when he cars on) it pumps nothing.... but just to check the pumps operation i used a 9 volt to see if it's a abd pump.... it's not the pump..... and i by passed the relay.. and the pump ran continualy but pumped nothing up.... but if i use the 9 vold i can push fuel with no problem....
ok let me ask you 1 more time ,, when you unplug the connector at the fuel pump ,, key on, someone crank the engine is there any power ( 12 volts ) at the yellow wire ? yes or no ...
is there any ground on the black wire ?? yes or no ...
what you are saying in the above statement makes no sense to me .. ( if you use a 9 volts power to the fuel pump it pump gas ) ( you bypass the realy, the pump runs continuosely but it pumps no gas ) .
Forgive me if i am not understanding your statement ..
chk the voltage with a volt meter at the yellow wire .at the fuel pump connector and let us know,, and also chk to make sure you are getting a good ground at the black wire .
Senior Member
Joined: Feb 2006
Posts: 6,290
From: Montana
RE: beautifuly clean 87 dx manual fuel pump problem
any more luck with this....? If I understand you correctly with the jumper in place, the pump does pump but no fuel flows, if you disconnect the wires and power the pump with just a 9V battery fuel DOES flow like normal? So you are getting electricity to the pump.... If that's the case (power to the pump but no fuel out front) I would probably take a 2 liter bottle and fill it with fuel, then run the line off the intake side of the fuel pump directly into the bottle of gas, if it pumps just fine then try to start the vehicle, if it pumps/runs, reconnect that line to the tank and try it again, if it doesn't pump and doesn't run then you've got a problem with your fuel tank....
I know this theory sounds odd but I'm wondering if the 9V is a small enough power source that it's not creating as much suction as the pump gets when it runs off the car battery (make sure your battery hasn't died by now...) so when the pump kicks on with it hooked up normally to the car it's sucking some junk up and cloging the line in the tank....
I know this theory sounds odd but I'm wondering if the 9V is a small enough power source that it's not creating as much suction as the pump gets when it runs off the car battery (make sure your battery hasn't died by now...) so when the pump kicks on with it hooked up normally to the car it's sucking some junk up and cloging the line in the tank....
Been Around A Long Time Member
Joined: Dec 2005
Posts: 4,754
From: In The Desert ( Sahara ? )
RE: beautifuly clean 87 dx manual fuel pump problem
if he uses a 9 volt power supply it works ( pumps fuel ) if he uses car power and bypass the relay , pump runs but does not pump fuel.. It almost sounds like there is a voltage drop issue ,,,,,,,Not enough voltage getting to pump with regular car power .......enought o make it run but not enough to pump fuel..
based on what he says it is the only thing that makes sense to me .
Unless i am totally MIS understanding what he is saying ..
If indeed it is a voltage drop could be an issue with the fuse box itself
based on what he says it is the only thing that makes sense to me .
Unless i am totally MIS understanding what he is saying ..
If indeed it is a voltage drop could be an issue with the fuse box itself
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