Efuel pump noise

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Feb 12, 2023 | 06:11 PM

96SD

Thread Starter

Laughing Gas

Joined: Sep 2019

Posts: 797

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From: Arkansas

Efuel pump noise

I dropped both tanks cleaned them out replaced both shower heads and installed a new selector valve. I have a new Bosch 200 fuel pump and when running on the front tank its just about silent. When running on the rear tank its quite loud. I cant tell how loud it is with the truck actually running just with the key forward. The pump is pushing a constant 60psi with no hiccups but it just has me slightly worried. With the glowplug relay energized the pump is much quieter but as soon as the glowplugs are not energized and the pump sees full voltage it gets noisy.
*Edit* Something also interesting. I tried lowering the fuel pressure at the regulator just to see what change it made in the pump noise. As I lowered the pressure the pump got louder and quieter as I raised the pressure. Which is exactly the opposite of what I thought would happen.

Feb 13, 2023 | 06:37 AM

97-psd

Logistics Pro

Joined: Mar 2007

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From: knoxville, tn

The change in sound makes sense. When you are lowering the pressure the pump is fighting some head pressure but when you are raising the pressure it is able to flow more easily.

the change in sound between tanks is odd. Any chance of a restriction that would make it work harder?

what type of efuel setup do you have in the valley?

Feb 13, 2023 | 07:54 AM

96SD

Thread Starter

Laughing Gas

Joined: Sep 2019

Posts: 797

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From: Arkansas

My setup is basically two lines. One from the pump and the other is return. The efuel keeps the diverter valve. Everything from the diverter valve forward is shared between tanks. I know when I removed the feed line from the rear tank to the diverter valve for replacement I had quite a bit of fuel pouring out. There was also a noticeable change in pump noise when I had the Walbro pump installed also. I figured I would clean the tanks, replace shower heads, change tank switching valve then install the Bosch pump and the pump noise would be gone. Nope.

Feb 13, 2023 | 06:55 PM

96SD

Thread Starter

Laughing Gas

Joined: Sep 2019

Posts: 797

Likes: 357

From: Arkansas

Called Irate Diesel today and asked what they thought. They said there should be no change in pump sound from front to rear tank and if there was its caused by a restriction. I re dropped the rear tank disconnected the lines and blew them out with shop air. then hooked it back up to the sending unit and blew through that with shop air. there were no noticeable restrictions and no garbage came out of the line there was also no change in the pump noise after. I unhooked the return line and ran the pump shes pumping, diesel everywhere. Think im just going to send it and see what happens.

Feb 14, 2023 | 08:49 AM

knottyrope

Lead Driver

Joined: Apr 2016

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From: Bahstun

selector valve could have debris in it or it might not be switching all the way

Feb 14, 2023 | 10:00 AM

96SD

Thread Starter

Laughing Gas

Joined: Sep 2019

Posts: 797

Likes: 357

From: Arkansas

Quote:

Originally Posted by knottyrope

selector valve could have debris in it or it might not be switching all the way

Brand new selector Ford valve from Riffraff. did not have a drop of diesel run through it until the tanks were cleaned and shower heads replaced. Walbro pump also made a different sound when changing tanks but the Bosh is noticeably different. Also changing the selector valve made no difference.

Feb 14, 2023 | 01:13 PM

BuddyBarnes

Laughing Gas

Joined: Jan 2016

Posts: 910

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From: Fl.

"when running on the front tank its just about silent. When running on the rear tank its quite loud." Could the sound change because the pump is pulling fuel further?
Looks like you have covered all other bases. I have had mine so lone I do not even notice till my pump goes south.