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      01-12-2023, 02:40 PM   #1
Delfan
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Fuel it 650hp fuel pump

Hi

Hoping to get some advice as struggling to get this fuel pump kit wired up and working correctly.

I emailed fuel it multiple times but haven't had any response.

Has anyone had experience with this kit? Some advice on wiring the hobbs switch to the relay would be great

Also the fuel gauge will only ever read 3/4 full
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      01-13-2023, 05:40 AM   #2
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yes.

for one, throw away the hobbs switch that comes with the kit, get a honeywell pressure switch. second test the new hobbs switch and set it to close the ground at the desired pressure which is probably 4psi.

on the fuel pump, ground to the chassis, use a clean ground preferably the ground terminal.

86- run to switched battery voltage
85- run to Hobbs switch pin 1
30- run to battery voltage use larger gauge wire here for pump power.
87- run to fuel pump power side.

Hobbs switch
pin 1- to relay pin 85
pin 2- chassis ground

if your tank doesnt read full something is blocking the measuring unit
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      01-13-2023, 02:29 PM   #3
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I will be fitting one of these in the next 2 weeks

Hope you sort it soon

Heard it’s a tight fit getting it all back in
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      01-17-2023, 05:29 AM   #4
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Quote:
Originally Posted by Bakerboy View Post
I will be fitting one of these in the next 2 weeks

Hope you sort it soon

Heard it’s a tight fit getting it all back in
try not to do it with the tank too full or youll be wrist deep in a tank of gasoline. its never a pleasant experience.
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      01-18-2023, 08:22 AM   #5
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Quote:
Originally Posted by amrazM View Post
yes.

for one, throw away the hobbs switch that comes with the kit, get a honeywell pressure switch. second test the new hobbs switch and set it to close the ground at the desired pressure which is probably 4psi.

on the fuel pump, ground to the chassis, use a clean ground preferably the ground terminal.

86- run to switched battery voltage
85- run to Hobbs switch pin 1
30- run to battery voltage use larger gauge wire here for pump power.
87- run to fuel pump power side.

Hobbs switch
pin 1- to relay pin 85
pin 2- chassis ground

if your tank doesnt read full something is blocking the measuring unit
Thank you for taking the time to reply. I'll check over my wiring at the weekend.
I've tested my hobb switch and it is configured to close the circuit at 4psi.

Do I still need to run fuses for the battery switched? Etc
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      01-20-2023, 07:14 AM   #6
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Quote:
Originally Posted by Delfan View Post
Thank you for taking the time to reply. I'll check over my wiring at the weekend.
I've tested my hobb switch and it is configured to close the circuit at 4psi.

Do I still need to run fuses for the battery switched? Etc
You only need a fuse on the 12V direct to battery.
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      01-20-2023, 08:49 PM   #7
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Quote:
Originally Posted by amrazM View Post
yes.

for one, throw away the hobbs switch that comes with the kit, get a honeywell pressure switch. second test the new hobbs switch and set it to close the ground at the desired pressure which is probably 4psi.

on the fuel pump, ground to the chassis, use a clean ground preferably the ground terminal.

86- run to switched battery voltage
85- run to Hobbs switch pin 1
30- run to battery voltage use larger gauge wire here for pump power.
87- run to fuel pump power side.

Hobbs switch
pin 1- to relay pin 85
pin 2- chassis ground

if your tank doesnt read full something is blocking the measuring unit

Agreed can’t stress enough the Hobbs switch with the kit is complete trash. I ordered the Honeywell one and worked like a charm.
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      01-31-2023, 05:38 PM   #8
Delfan
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Quote:
Originally Posted by lonatic View Post
Agreed can’t stress enough the Hobbs switch with the kit is complete trash. I ordered the Honeywell one and worked like a charm.
Do you have a part number? They aren't readily available in the UK so will look to have one shipped
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      02-01-2023, 12:18 AM   #9
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Quote:
Originally Posted by Delfan View Post
Do you have a part number? They aren't readily available in the UK so will look to have one shipped
M4006-4 I believe
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      02-19-2023, 04:54 AM   #10
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Quote:
Originally Posted by amrazM View Post
yes.

for one, throw away the hobbs switch that comes with the kit, get a honeywell pressure switch. second test the new hobbs switch and set it to close the ground at the desired pressure which is probably 4psi.

on the fuel pump, ground to the chassis, use a clean ground preferably the ground terminal.

86- run to switched battery voltage
85- run to Hobbs switch pin 1
30- run to battery voltage use larger gauge wire here for pump power.
87- run to fuel pump power side.

Hobbs switch
pin 1- to relay pin 85
pin 2- chassis ground

if your tank doesnt read full something is blocking the measuring unit

Hello everybody
Why do you say the Hobbs switch is trash?

I ask this because we are in the middle of editing and we are having a problem getting it to work... even fixed

And the switch must intervene at 6 psi, is 4 psi, as you indicate with the HoneyWell M4006-4, safe?

:arc:
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      02-21-2023, 05:23 AM   #11
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I am using a honey well 76575-4 N/0, its designed to work at 1-10PSI
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      02-21-2023, 03:00 PM   #12
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Quote:
Originally Posted by amrazM View Post
I am using a honey well 76575-4 N/0, its designed to work at 1-10PSI
Same one I bought aswell. So far so good
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