New Fuel Pump not working at all (Page 1/5)
TheDuke APR 07, 06:07 PM
dropped the tank installed new pump with new sock and new pulsator, filter, relay, fuse, put it all back in with 5 gallons of gas and..............nothing. Anyone got any ideas?
TheDuke APR 07, 06:08 PM
sorry this is on an 86 2.5 SE
qwikgta APR 07, 07:12 PM
So when you turn the key, you don't hear the pump? Did you pull the old one b/c it also did not work? Maybe the old one worked and what ever caused it to "stop" running has not been fixed, hence the new one is also not working? Have you tried putting 12v power and ground to the one you pulled out? If you do and it works then you know it was not the pump. Then you need to see if your getting power to the relay. If you turn the key, do you hear the relay click? if so, then its not the relay. After that, maybe someone else can weigh in.
TheDuke APR 07, 07:30 PM
the old one was literally falling apart, instead of a pulsator they had used a piece of hose that apparently wasn't gas rated, the guy i bought it from told me the fuel pump had gone out, turns out it had turned the rubber hose to gum and it had gotten everywhere. had to clean out the entire tank of gum and rust, what fun. now when i turn the key you do hear the relay click but the pump does not make any sound at all.
nero APR 07, 07:43 PM
Check out this post n how to jump the fuel pump to get it to run http://www.fiero.nl/forum/Forum2/HTML/141986.html . There are more posts on how to do this. This will eliminate the fuel pump relay / ecm etc so if it works then one of those are the issue. If it does not, it would be the wiring directly to the pump or the pump itself.

FYI, when I got my Fiero the fuel pump was wired into the ignition coil to bypass the relay. After removing the by pass the fuel pump would not turn on. I replaced the relay and still no fuel pump. After running through the diagnostic steps in the service manual, I traced it back to a bad ECM. I replaced the ECM and that fixed the issue. However, if you can hear your relay click this is probably not the issue.
TheDuke APR 07, 08:58 PM
i went out and straight wired the pump to the battery to check it, it does nothing at all so i guess its the pump and will replace the brand new pump tomorrow
Dennis LaGrua APR 08, 01:13 PM
I would first check the connector. If that doesn't do it replace the pump. Sounds like you got a Chinese made pump of questionable quality. .

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TheDuke APR 08, 03:27 PM
replaced ecm, still no fuel pump
Patrick APR 08, 04:20 PM

quote
Originally posted by TheDuke:

i went out and straight wired the pump to the battery to check it, it does nothing at all...




quote
Originally posted by TheDuke:

replaced ecm, still no fuel pump



I realize you're frustrated... but if powering the fuel pump directly doesn't get it to run, how would replacing the ECM accomplish anything?

It's either the fuel pump itself or the wiring/connections.
TheDuke APR 08, 05:16 PM
i have checked the fuse box got 12v there, but when i check the wire right at the firewall first in the engine bay and then in the interior and im at 8.5v. i cant figure out where I'm losing voltage or why. i straight wired the fuel pump to make sure it worked, not permanently. so is there a connection or another relay or something between the fuse panel and the firewall?