This is topic 351w swap in forum Tech Talk at Northern California Ford Owners  .


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Posted by fam_lace (Member # 8565) on :
 
i got a 4 bang that i change to a 351w and i changed everything but my fuel pump is not turning on when i turn the key its brand new but i think i got something thats not hooked up right cause i checked the pump from the trunk and it cuts on
 

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Posted by 89goose (Member # 7196) on :
 
how did you check from the truck if the pump was working ?
and here is a schematic - follow the fule pump relay -use a test light to see if it has power

http://www.veryuseful.com/mustang/tech/engine/images/fuel-alt-links-ign-ac.gif

hope that helps
 

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Posted by Blind (Member # 3052) on :
 
the fuel pump relay underneath the drivers seat on a 4banger is a dummy, it has no function.

you need to replace it with a real fuel pump relay, either from a v8 donor car, or buy one for a v8 mustang from a parts store.

just one of the many differences on a 4 banger compared to a 5.0...

[ August 11, 2008, 09:30 PM: Message edited by: Blind ]
 

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Posted by Eddie510- (Member # 2354) on :
 

quote:

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Originally posted by Blind:
the fuel pump relay underneath the drivers seat on a 4banger is a dummy, it has no function.

you need to replace it with a real fuel pump relay, either from a v8 donor car, or buy one for a v8 mustang from a parts store.

just one of the many differences on a 4 banger compared to a 5.0...

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what do you think my problem is blind... My 88 4cyl conversion as well has a problem, when i turn key on the fuel pump stays on I tried a relay from the junk, about 3 of them but same thing. but i see your saying that relay is a dummy, but when i take it off it wont start

[ August 11, 2008, 10:13 PM: Message edited by: Eddie510- ]
 

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Posted by fam_lace (Member # 8565) on :
 
i checked the relay and i check the pump from the trunk it works i got two diffrent relays that connect to the harness but its not working and there were both for v8s
 

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Posted by fam_lace (Member # 8565) on :
 
does the 4cyl suppose to have the relay under the seat because i dont have it the car is a 92 mustang
 

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Posted by fam_lace (Member # 8565) on :
 
i had two computers and i got them mixed up the 92 V8 computer works the other was from a diffrent v8 thanks
 

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Posted by Blind (Member # 3052) on :
 

quote:

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Originally posted by fam_lace:
does the 4cyl suppose to have the relay under the seat because i dont have it the car is a 92 mustang

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quote:

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Originally posted by Eddie510-:

quote:

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Originally posted by Blind:
the fuel pump relay underneath the drivers seat on a 4banger is a dummy, it has no function.

you need to replace it with a real fuel pump relay, either from a v8 donor car, or buy one for a v8 mustang from a parts store.

just one of the many differences on a 4 banger compared to a 5.0...

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what do you think my problem is blind... My 88 4cyl conversion as well has a problem, when i turn key on the fuel pump stays on I tried a relay from the junk, about 3 of them but same thing. but i see your saying that relay is a dummy, but when i take it off it wont start

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