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Fuel pump relay by tom10122
Started on: 10-15-2014 07:38 PM
Replies: 13 (287 views)
Last post by: olejoedad on 10-16-2014 07:21 PM
tom10122
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Report this Post10-15-2014 07:38 PM Click Here to See the Profile for tom10122Click Here to Email tom10122Send a Private Message to tom10122Edit/Delete MessageReply w/QuoteDirect Link to This Post
Think my relay went/ is going. It takes some cranking to get it to start cold. Believe the battery is fine. I turned the key on and off a few times and heard the pump only once and haven't since (heard it the third time I tried I think). I do hear a relay clicking though. Starts fine warm and runs great, just want it perfect I did run out of gas yesterday due to a faulty gas gauge but I would think that would damage the pump, not the relay correct? Since the pump is cooled by the fuel.
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Lou6t4gto
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Report this Post10-15-2014 07:44 PM Click Here to See the Profile for Lou6t4gtoClick Here to Email Lou6t4gtoSend a Private Message to Lou6t4gtoEdit/Delete MessageReply w/QuoteDirect Link to This Post
Do you have a duke or a 2.8 6cyl ? If a 6, could be the cold start injector not working.
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tom10122
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Report this Post10-15-2014 07:58 PM Click Here to See the Profile for tom10122Click Here to Email tom10122Send a Private Message to tom10122Edit/Delete MessageReply w/QuoteDirect Link to This Post
Yeah I have the 6cyl , I hear a relay clicking but not the pump, heard the pump once thats it. Are there any other relays I could be hearing?
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Gall757
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Report this Post10-15-2014 08:47 PM Click Here to See the Profile for Gall757Send a Private Message to Gall757Edit/Delete MessageReply w/QuoteDirect Link to This Post
Looks to me that you damaged your pump. You can change the position of the relays behind the driver's seat....they are both the same. But if you hear clicking, chances are the relay is working and the pump is no longer workable.
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tom10122
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Report this Post10-15-2014 08:58 PM Click Here to See the Profile for tom10122Click Here to Email tom10122Send a Private Message to tom10122Edit/Delete MessageReply w/QuoteDirect Link to This Post
But it wouldn't run right if it was damaged right? It runs fine once started.

[This message has been edited by tom10122 (edited 10-15-2014).]

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Gall757
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Report this Post10-15-2014 09:42 PM Click Here to See the Profile for Gall757Send a Private Message to Gall757Edit/Delete MessageReply w/QuoteDirect Link to This Post
The FP relay could be faulty....or perhaps it's the connector base or wiring. Sometimes they get corroded.
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tom10122
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Report this Post10-15-2014 09:46 PM Click Here to See the Profile for tom10122Click Here to Email tom10122Send a Private Message to tom10122Edit/Delete MessageReply w/QuoteDirect Link to This Post
I'll check it out tomorrow thanks, I'll swap the fuel pump relay and the a/c relay and put some dielectric grease on the connectors.
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olejoedad
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Report this Post10-15-2014 09:56 PM Click Here to See the Profile for olejoedadClick Here to Email olejoedadSend a Private Message to olejoedadEdit/Delete MessageReply w/QuoteDirect Link to This Post
 
quote
Originally posted by Lou6t4gto:

Do you have a duke or a 2.8 6cyl ? If a 6, could be the cold start injector not working.


The cold start injector doesn't fire unless coolant temp is below 35°F.......

Been cold in Florida lately?

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olejoedad
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Report this Post10-15-2014 09:58 PM Click Here to See the Profile for olejoedadClick Here to Email olejoedadSend a Private Message to olejoedadEdit/Delete MessageReply w/QuoteDirect Link to This Post

olejoedad

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quote
Originally posted by Gall757:

Looks to me that you damaged your pump. You can change the position of the relays behind the driver's seat....they are both the same. But if you hear clicking, chances are the relay is working and the pump is no longer workable.


It stands to reason that if the pump 'is no longer workable', the car wouldn't start and run........

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tom10122
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Report this Post10-16-2014 09:21 AM Click Here to See the Profile for tom10122Click Here to Email tom10122Send a Private Message to tom10122Edit/Delete MessageReply w/QuoteDirect Link to This Post
Quick update between classes, I heard the pump come on and it started on the first revolution this morning so the problem seems intermittent, I'm going to take a look at the connections later today
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Lou6t4gto
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Report this Post10-16-2014 01:52 PM Click Here to See the Profile for Lou6t4gtoClick Here to Email Lou6t4gtoSend a Private Message to Lou6t4gtoEdit/Delete MessageReply w/QuoteDirect Link to This Post
I DO live in Fla, and the 2 fiero's I had with 2.8s, the cars DID start much better WITH the cold start. And no way was it under 60 degrees. disconnect the cold start (Motor cold, had not run in a day or so,) and the motor would crank for a few seconds when cold, not so when the Inj sensor was plugged in
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tom10122
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Report this Post10-16-2014 01:59 PM Click Here to See the Profile for tom10122Click Here to Email tom10122Send a Private Message to tom10122Edit/Delete MessageReply w/QuoteDirect Link to This Post
Took some cranking after school , what's the best way to get at the relays?
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Alex.07.86GT
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Report this Post10-16-2014 03:18 PM Click Here to See the Profile for Alex.07.86GTSend a Private Message to Alex.07.86GTEdit/Delete MessageReply w/QuoteDirect Link to This Post
 
quote
Originally posted by tom10122:

Took some cranking after school , what's the best way to get at the relays?


its on the fire wall right behind the drivers seat. You could take out the air cleaner box if you want.

what you really need to do is stop guessing and get a fuel pressure gauge to see what exactly is going on with the fuel.

*if you need GM relays or just want to change them due to age ..I got mine hassle free at amazon.

[This message has been edited by Alex.07.86GT (edited 10-16-2014).]

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olejoedad
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Report this Post10-16-2014 07:21 PM Click Here to See the Profile for olejoedadClick Here to Email olejoedadSend a Private Message to olejoedadEdit/Delete MessageReply w/QuoteDirect Link to This Post
 
quote
Originally posted by Lou6t4gto:

I DO live in Fla, and the 2 fiero's I had with 2.8s, the cars DID start much better WITH the cold start. And no way was it under 60 degrees. disconnect the cold start (Motor cold, had not run in a day or so,) and the motor would crank for a few seconds when cold, not so when the Inj sensor was plugged in


The cold start injector switch is thermostatic; i.e., it is open above 35°......no cold start injector.
My son had a similar issue on his Formula.......after replacing the timing chain the engine fired immediately.

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