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[Fuel pump] Is upgraded bulk head connectors or relay mod needed for fuel pump upgrade?

jtha7
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jtha7 Apprentice

jtha7

Posted
Posted

Hi guys my 94 r33 gtst fuel pump has gone out. I have a walbro 525 ready to go in but am unsure if I need to upgrade the fuel tank bulk heads? Ive heard that others have issues with the stock wiring melting...

Ive seen alot of people recommend this: https://frenchysperformancegarage.com/products/fpg-nissan-skyline-r33-r34-silvia-s14-s15-billet-fuel-tank-bulkhead-hat-top-an6-with-high-current-connector-apex-2-8-delphi-fpg-100?variant=42873255198898

My current pump that stopped working is aftermarket but I had no relay mod or upgraded connectors.

Need some advice please. TIA

Kinkstaah Grand Master

Kinkstaah

Posted
Posted

YES.

If you have a walbro on stock wiring gauges it WILL melt.
Perhaps if you are some level of amazing crimping genius it may not. It may seem fine for ~8 years with bulkhead connectors and then melt when you're interstate in NSW and need a 1000km tow home after waiting 10 hours. Ask me how I know.

This depends on whether your car is stockish, or whether you need to keep it going in the meantime.
Depends on the power you want.

The JJ DeatschWerks kits can utilize (and do) stock wiring/pump/plugs. They won't do much more than 320 (?) kw on depending on your boost level and E85 use. They flow more on 98. 

If you need more than that... and have the cash and are going to do it anyway? Do it now. I would not be putting a Walbro 525 in my car without some upgraded AN fittings/bulkheads/etc that Frenchies use. just do the FPG hat/bulkhead fix at the same time and never worry once you put it all back together and have peace of mind.

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Murray_Calavera Mentor

Murray_Calavera

Posted
Posted

Those Efi bulkhead terminals have been in the car for about a year now, they are perfect. 

So, upgraded wiring, relay mod, uprated terminals and you can run that pump flat out all the time no issues. 

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Duncan Grand Master

Duncan

Posted
Posted

I'm not certain about the fuel hat connectors (noting, I DID have to replace the hat in my Stagea with one of these pumps)

However, you 100% do need to do a properly sized relay mod, the factory wiring is definitely too small for these pumps. 

soviet_merlin Mentor

soviet_merlin

Posted
Posted

I'm with Kinkstaah on this one. Do it once, do it right. So much better for your mental health. The sneaky thing about the fuel pump wiring is that it will work perfectly fine for the longest time. Until that one moment when it decides to shit the bed. And it's not worth the paranoia from not trusting the car anymore. At least other mechanical issues announce themselves by developing some noise or other warning.

If you have the funds, I'd suggest to go with a good kit like Frenchys and get the work done by a trustworthy shop. No regrets there.

The only downside to the Frenchys kit on the Stagea/R32 GTR is that their fuel level sender is not on point. But looks like the R33 kit maintains the factory sender so should not be an issue.

This is what the botched setup on my Stagea looked like before it stopped working. It had melted its way quite a distance down. Glad it didn't burn down the car.

IMG_20250615_101716.thumb.jpg.faddcec8b7537fdd894950a634f5597b.jpg

 

Some links I came across when I looked for solutions:

Radium sells a DIY wiring kit that looks promising. I didn't buy it though, I let my workshop decide on wiring.

https://www.prospeedracing.com.au/products/radium-diy-fuel-pump-hard-wiring-kit-17-0031

https://www.radiumauto.com/DIY-Fuel-Pump-Wiring-Kit-P368.aspx

 

You can also get cheap replacements for the locking ring depending on how mangled it looks:

https://www.kudosmotorsports.com/Nissan-17343-79900-Fuel-Tank-Outlet-Locking-Ring-for-Nissan-S14-S15-BNR32-R33-R34-AWC34

There are tools for unscrewing it as well so you don't have to abuse it with a screwdriver and mallet. The Frenchys one is expensive but I'm sure there are cheaper ones.

Kinkstaah Grand Master

Kinkstaah

Posted
Posted
12 hours ago, Murray_Calavera said:

Those Efi bulkhead terminals have been in the car for about a year now, they are perfect. 

So, upgraded wiring, relay mod, uprated terminals and you can run that pump flat out all the time no issues. 

Mine was great for years too!

  • Like 1
Murray_Calavera Mentor

Murray_Calavera

Posted
Posted
12 minutes ago, Dose Pipe Sutututu said:

You never drive your car at 100% all day, why does your fuel pump need to be at 100% all day?

Hasn't risen high enough on the to do this yet for it to be done lol. 

One day it will be done... one day...

11 minutes ago, Kinkstaah said:

Mine was great for years too!

I know, but I tell myself its ok because I took a heap of temp measurements of the terminals over a 12 or so hour drive, temps were never an issue. Plus I made sure to pat the bulk head and say "she'll be right". So, yep she'll be right lol. 

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