aero fuel pump relay.
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From: brooksville, florida
aero fuel pump relay.
Hi every body, i have a problem that i have never come across before let me explain. My fuel pump relay went bad the other day (van would not start after stalling at traffic lights, why do they always do this in the most inconvenient places) anyway i bourght a new one from the parts store and fitted it, i tried to start the van and still no fuel pump so i am still at the road side and the parts store would not replace relay because it is electrical item so i have to buy another relay still the fuel pump is not working, now i am really angry i pull apart the old relay and find the contacts are welded together i pulled them apart and cleaned them with a nail file i had in the van i put the old relay back in the van and volar it starts. I tried both the new relays again and it would not start so back in goes the old relay and it starts. Now the only differance with the new relays is that they are electronic and have no moving parts, and my question is WHY wont they work in my van.? Any of you clever people out there know why.? Oh i am not that good with auto electrics so i am stumped
Post Fiend
Joined: Apr 2005
Posts: 5,720
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From: Washington state
measure the coil of the new relay with ohm meter....infinity means open coil='s no workie
who is manuf. of parts store relay? complain to their consumer warranty div....
parts always fail where there is no restroom....it's 110d outside...kids are hungry and tired....and it's Sunday 150 miles from home and parts store doesn't open until 8:30 AM Monday morning...closest cockroach motel has front porch out of "Deliverance"
who is manuf. of parts store relay? complain to their consumer warranty div....
parts always fail where there is no restroom....it's 110d outside...kids are hungry and tired....and it's Sunday 150 miles from home and parts store doesn't open until 8:30 AM Monday morning...closest cockroach motel has front porch out of "Deliverance"
Postmaster
Joined: Sep 2003
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From: Southern California
CBR900:
You mentioned that the new relays are electronics, and have no moving part. That means no coil, no contacts, right? I suspect that the new "relays" you got are MOSFET transistors. If so, they are not intended for direct replacement of a normal electromechanical relay. They can be used, but you must know exactly how your circuit is routed.
If the present relay is downstream of the load just before the ground, you'll need an N-channel Mosfet. If the relay is upstream of the load, right after the 12V, then you'll need a P-channel Mosfet. Given all that, I would not recommend going from a mechanical to an electronic relay, Too chancy since the guy who designs the relays has no way of knowing where in the circuit it'll be placed. Also, the way these electronic relays are turned on is also different. N-channel FETs are turned on by kicking the gate voltage high, while the same thing would turn off the P-channel FETs. Too many things can go wrong.
You mentioned that the new relays are electronics, and have no moving part. That means no coil, no contacts, right? I suspect that the new "relays" you got are MOSFET transistors. If so, they are not intended for direct replacement of a normal electromechanical relay. They can be used, but you must know exactly how your circuit is routed.
If the present relay is downstream of the load just before the ground, you'll need an N-channel Mosfet. If the relay is upstream of the load, right after the 12V, then you'll need a P-channel Mosfet. Given all that, I would not recommend going from a mechanical to an electronic relay, Too chancy since the guy who designs the relays has no way of knowing where in the circuit it'll be placed. Also, the way these electronic relays are turned on is also different. N-channel FETs are turned on by kicking the gate voltage high, while the same thing would turn off the P-channel FETs. Too many things can go wrong.
Last edited by copper_90680; Feb 24, 2006 at 03:57 PM.
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From: brooksville, florida
The relays came from Discount auto's a huge chain store, and the name on the box is GP SORENSEN made in india and part # is 413170 There is a coil but no contactors like on the old type and they are sold as a direct replacement for the original relay, (according to dicount auto's). As for MOSFET and n-channels I am not very good with electric's especially electronics and don't have a clue what your talking about. I thought this was just a plug in replacement I have used this type of relay in some of the other circuits without a problem and if like you say Copper these relays are a bit chancy for the circuits then why do they sell them as a direct replacement, please dont misunderstand me Copper I am not saying your wrong I just don't understand why they went from mechanical acton to electronic and why this relay does not work in my fuel pump circuit, By the way I went down to the junk yard yesterday and rescued a load more of the old type relays just-in-case
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From: Southern California
Originally Posted by cbr900
The relays came from Discount auto's a huge chain store, and the name on the box is GP SORENSEN made in india and part # is 413170 There is a coil but no contactors like on the old type and they are sold as a direct replacement for the original relay, (according to dicount auto's). As for MOSFET and n-channels I am not very good with electric's especially electronics and don't have a clue what your talking about. I thought this was just a plug in replacement I have used this type of relay in some of the other circuits without a problem and if like you say Copper these relays are a bit chancy for the circuits then why do they sell them as a direct replacement, please dont misunderstand me Copper I am not saying your wrong I just don't understand why they went from mechanical acton to electronic and why this relay does not work in my fuel pump circuit, By the way I went down to the junk yard yesterday and rescued a load more of the old type relays just-in-case
If these have coils, then I was wrong, and I have no idea why they don't work
As for parts that don't work out of the box, that has happened more and more frequently for me since some of the foreign manufacturers are not too picky about quality control 
Now that you mentioned it, I need to go to the junkyard too
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From: brooksville, florida
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Post Fiend
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From: Washington state
the contacts are sealed and not open like the old type...protects contacts points from corrosion...water leaks in along pin connectors
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From: brooksville, florida
well ok so the contacts are sealed, but it still does not explain why this particular type of relay does not work in my van and like you say the contactors are sealed so how do they work, what makes the contact.? I am interested to know.
Post Fiend
Joined: Apr 2005
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From: Washington state
Ford made several relay changes over the production years of the Aero....one size fits all doesn't work well for OEM replacement parts
pin out must be different or the coil is open
i show at least 4 different types of fuel pump relays used over the production lifespan of the Aero
my listing shows an RY-46 Standard brand fuel pump relay for the 91 Aero....Standard is the parent company of GP Sorenson
http://www.smpcorp.com/web_app/catalog/images/RY46.jpg
pin out must be different or the coil is open
i show at least 4 different types of fuel pump relays used over the production lifespan of the Aero
my listing shows an RY-46 Standard brand fuel pump relay for the 91 Aero....Standard is the parent company of GP Sorenson
http://www.smpcorp.com/web_app/catalog/images/RY46.jpg
New User
Joined: Jan 2006
Posts: 13
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From: Bradenton, FL
My '86 relay went bad... Bought a Pilot (30A driving light relay) from Auto Zone ($4.99) and wired it in. Zero problems or malfunctions as of yet. It's been in there for quite some time now. Older (standard) coil and contact system...
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