Fuel pump voltage
#1
Fuel pump voltage
Checked the service manual and did not get anything, can you please tell me what is the normal voltages in low speed (idle) and high speed (boost). I am getting 4volts at idle and 10.9 volts in boost I am thinking that the fuel pump is bad causing the voltage to drop can anybody please verify thanks.
#4
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Thanks I assume you just tapped on the wires to the pump before the connector.
I remember seeing in the tuning forum section voltage numbers awhile back. Try searching on that section. I'll look for it myself.
I remember seeing in the tuning forum section voltage numbers awhile back. Try searching on that section. I'll look for it myself.
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Checked the service manual and did not get anything, can you please tell me what is the normal voltages in low speed (idle) and high speed (boost). I am getting 4volts at idle and 10.9 volts in boost I am thinking that the fuel pump is bad causing the voltage to drop can anybody please verify thanks.
#6
yes I tapped the wires before the connector, I am running a walbro GSS342 thing is I ran a direct from the battery to the pump and when I attached it the pump started grinding when the voltage increased to 11.6 volts my idle felt much smoother and my AFR's at WOT got better. Don't get me wrong but I don't think 10.9 volts is good at all since the pump is rated at 12volts for 43.5psi correct me if I am wrong.
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#8
it sounding like if the gears in the pump is sticking with more voltage not the norma; wining noise associated with the Walbro's, what I did not mention is the reason why I am trying to find out what voltage the pump operates. About 3 days ago while in traffic my car started cutting off I taught it was the IAC screwing up but when I restarted if worked fine, then my afr's started going wack from pull off the car started leaning out until 2k rpm and with my tuned AFR of 11.6 on pump it stated going to mid 12's at WOT don't matter how much fuel I would throw via ecu flash it would still be lean I taught it was a vac line but after changing all it still did the same thing. This is what lead me to pump I also tested the fuel pump relay and its .70ohm the service manual said it should be within .45-.65 value at 20*C but where I live our min temp will be 24*C so I assume this would be normal.
#9
the resistance readings of the pump should be around 0.7 ohms. remeber when checking continuity make sure voltage is off. True continuity is .5 ohms or less if its below this its bad and if the readings are too high its bad. If these readings are good the pump is good hands down...
#11
also these pumps are designed to operate on 11 to 15 volts. Your voltage is a little low. try jumping the relay with a jumper wire. If this works your relay might not be energizing.
#12
do I just unplug the 2 pin jack and jumper it? or do I have to jumper it with it pluged in? also I found this in the search
https://www.evolutionm.net/forums/ev...ormal-ops.html
scroll down to the bottom it appears that my voltages are way off.
https://www.evolutionm.net/forums/ev...ormal-ops.html
scroll down to the bottom it appears that my voltages are way off.