Twin pumps in a 1998
Twin pumps in a 1998 
I'm installing twin pumps on a 1998 car. 1 pump will be on a hobbs switch. I'm open to having both run all the time though, as my return will be 6AN ptfe line on a boost referenced regulator. I'm unsure what even half of these connections are for. This is a racetronix bulkhead connector setup.
Joined: Apr 2006
Posts: 3,891
Likes: 1,137
From: Grand Rapids, Michigan
I'm still building my car, but I did this install on my stock hanger a year or so ago and I have pics somewhere. Might take me a week to find them, unfortunately. They were on an old phone. I will say, when I talked to the WS6 store, they said there's zero issues with running both pumps at the same time.
What harness part number is that? For a 99-02 for example, the Racetronix goto with a hobbs switch is
UDPH-005
IDPH-F99HD
DP-ITWH-042
HIH-001
HPS-7
What pumps are you running? It’s best to convert to the newer bulkhead. Racetronix can get you setup with whatever remaining harnesses or end plugs you need based on what you have to convert the 98 setup. Just tell them the setup and that you want to run both pumps full time with no hobbs switch.
UDPH-005
IDPH-F99HD
DP-ITWH-042
HIH-001
HPS-7
What pumps are you running? It’s best to convert to the newer bulkhead. Racetronix can get you setup with whatever remaining harnesses or end plugs you need based on what you have to convert the 98 setup. Just tell them the setup and that you want to run both pumps full time with no hobbs switch.
Joined: Mar 2002
Posts: 2,032
Likes: 26
From: A Racetronix dealer near you...
I'm installing twin pumps on a 1998 car. 1 pump will be on a hobbs switch. I'm open to having both run all the time though, as my return will be 6AN ptfe line on a boost referenced regulator. I'm unsure what even half of these connections are for. This is a racetronix bulkhead connector setup.
This would be a F98 DP wiring solution:
UDP HD Fuel Pump Wiring Harness (MP280)
Item #: UDPH-005
Unit Price: $130.00
In Stock & Ready to Ship
Intermediate Double Pump Harness F98
Item #: IDPH-F98
Unit Price: $79.99
In Stock & Ready to Ship
Hobbs Interface Harness 72" - DPK
Item #: HIH-001
Unit Price: $17.50
In Stock & Ready to Ship
Pressure Switch, 7PSI, SPST M/P280S
Item #: HPS-7
Unit Price: $27.07
In Stock & Ready to Ship
Running both pumps all the time is a bad idea for a number of reasons.
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Please support a Racetronix dealer near you for personalized service.
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I'm installing twin pumps on a 1998 car. 1 pump will be on a hobbs switch. I'm open to having both run all the time though, as my return will be 6AN ptfe line on a boost referenced regulator. I'm unsure what even half of these connections are for. This is a racetronix bulkhead connector setup.
I will note that I had one hell of a nightmare on my 91 Z28 with this double pump harness. None of it worked correctly. I was back and forth with Racetronix and still got nowhere. Power just would not get to the pumps at all. I ended up pulling the main harness out and used the sender bulkhead and in tank wiring harness then cut the main harness up and wired up the pumps myself and haven't had a single issue
Last edited by 91 Z28; Jan 29, 2024 at 08:48 PM.
Here's a detailed write up of an install of those exact harnesses (UDPH 005, IDPH-F98, and HIH-001) on a 98:
https://ls1tech.com/forums/fueling-i...ct-review.html
Post #15 in this link and onward.
https://ls1tech.com/forums/fueling-i...ct-review.html
Post #15 in this link and onward.
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Here's a detailed write up of an install of those exact harnesses (UDPH 005, IDPH-F98, and HIH-001) on a 98:
https://ls1tech.com/forums/fueling-i...ct-review.html
Post #15 in this link and onward.
https://ls1tech.com/forums/fueling-i...ct-review.html
Post #15 in this link and onward.
For anyone stumbling upon this in the future, post above covers everything.
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Verdad Gallardo Joined: Apr 2006
Posts: 3,891
Likes: 1,137
From: Grand Rapids, Michigan
Glad Racetronix chimed in here, as I was planning on running both pumps at the same time. Going to be swapping my 255's for 340's before I start, too, as I was misinformed as to how much power the twin 255s could support. Live and learn, I guess.