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Old 04-15-2019, 09:08 PM   #1
Ka24det_YEG
 
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Default Electrical problems

I have a 1988 d21, has a ka24det from an s13 swapped in, recently had my fuel pump go bad so I used the opportunity to upgrade to a 255 walbro, after doing so the truck fired right up and I was able to drive it a few minutes, but after a bit of driving my 10a fuse blew, I figure it just needed a 15 because it was more flow but once again same thing, very inconsistent times the fuse blows, sometimes as soon as a turn the key to ignition it will blow and sometimes I have to drive a bit, so I started opening up my harness to find a short hit didnt find any one the wiring directly related to the fuel pump, i fixed 2 shorted grounds hoping it might still be the problem but still similar problem, now every time it will start and drive but sometimes after 20 min of driving or 40 min it will blow again(which sucks because usually that means I'm far from the house) so I've been following every wire to find shorts with still no luck.
a few weeks ago when the fuse was blowing instantly I unplugged the connector under the passenger seat to see if my short was before said plug or after and the fuse did blow leading me to think that the problem is between said clip and the fuse, I didnt know what to do with that yet but yesterday I check for continuity in the plug and all the pins show no continuity, which in theory confuses the hell out me, I'm at quite a lost for where to look, I've been tinkering trying to fix up what ever I can find that might now be perfect and I am able to drive the truck every time but I've had the fuse blow after a few minutes of driving almost every time I think I have it fixed. Anybody have any kind of input I really dont want to waste more money at a shop .
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Old 04-15-2019, 09:35 PM   #2
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Do you know what the actual draw on the pump is relative to the one that came out of the truck? Is the new pump you put in a model that uses variable voltage to determine flow or is it just a static 12v on/off type?
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Old 04-15-2019, 09:54 PM   #3
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Why not just wire in a seperate relay for the fuel pump. Not sure the nissan wiring is enough for the walbro. Just Google fuel pump relay upgrade and you should find enough info.
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Old 04-16-2019, 12:40 AM   #4
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Not sure on new pump volt output, I was thinking of hard wiring it just not sure how it would know how much fuel to send, I feel like it's probably simple lol but I've never done this before so I dont want to go through the work of hard wiring if that wont fix my issueis
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Old 04-16-2019, 12:42 AM   #5
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Quote:
Originally Posted by 91nissan94 View Post
Why not just wire in a seperate relay for the fuel pump. Not sure the nissan wiring is enough for the walbro. Just Google fuel pump relay upgrade and you should find enough info.
This is what I'm thinking now, after researching for hours apperently everyone hardwired the 255 or bigger pumps into the s13 because of the amperage going to high at high rpms and causing said problem so I guess hard wire will kill 2 birds with 1 stone hopefully
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Old 04-16-2019, 03:07 AM   #6
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This seems to be a standard mod for most non factory turbo cars. Let us know if it helps.
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Old 04-16-2019, 09:41 AM   #7
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Might want to do an inline 30 amp fuse as well. The kind where you can pull out the blade fuse from the top. Just to prevent a wiring fire.
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Old 04-16-2019, 02:45 PM   #8
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it actually sounds like you missed a factory ground somewhere. i had this happen on another car i owned. i missed a ground when putting the motor back in and even though i had extra grounds (something i always do) the car was still eating fuses every 10 mins. it got to the point that i bought a resettable circuit breaker that goes in the fuse slot.

its incredible how important those factory ground locations are. theres some serious current return network engineering that goes into them

link to electrical specs of the pump. note, electric pumps will draw whatever current they want as long as the fuse holds. the more resistance the pump sees the more current it will draw. Looks like anywhere from 7.5-12ish amps


http://www.roadraceengineering.com/f...pflowrates.htm
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Old 04-17-2019, 02:45 PM   #9
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Hard wired the pump in with a sweet switch thanks for the advice seems to be working as of now
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