Item #: FS15
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Fuel shut-off solenoid for '89-'93 Dodge Cummins Turbo Diesel trucks with the 5.9L, 12-valve Cummins engine.

Includes plunger and spring.

Replaces Cummins 3903575 and Mopar 4429575


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Very helpful
Oct 12, 2015  |  By Brandon
Bought the solenoid about 2 weeks ago, Noticed a small leak, Called the company and they was very helpful in fixing my problem. Always will be my first place I got to if I need parts.

Great Replacement
Mar 12, 2016  |  By John
My FSS crapped out on me after doing some pump tuning and aggressively driving. I did a lot of searching and asking around and was finding expensive replacement FSS's on other sites. I finally ran across this one here from Geno's and for only $20 I wanted to give it a try. It's now been around 7mos and the FSS has been performing great. I would recommend this FSS to anyone looking for a replacement before buying one for over $100 else where.

Works great
Sep 28, 2016  |  By Brett
truck shuts off so it does its job

FSS for first gen
Oct 2, 2016  |  By Cain
I have bought expensive autopart store ones I've waited 6 months and bought cheap China ones and also didn't work I've biught expensive ones off eBay and they didn't work and I've tried the pull cable trick finally decided to just one one from genos and problem solved just like they claim. I'll be back just because of this

Ok, for a while
Nov 29, 2016  |  By John Casteel
I couldn't update my previous review so I'll just leave another. These are ok for temporary replacements if you're in a bind and don't wanna run a kill cable. I have went through several the past year due to the plungers ripping. I don't hotrod my truck and the fuel isn't even turned up much at all. I think the rubber is just cheaper than genuine Bosch. So for $20 these are good enough to be used as a spare, but rather than replacing it several times a year at $20/each just spring for genuine Bosch and if you don't drive like an idiot it should kast you forever.

Not bad
Feb 6, 2017  |  By Andrew Smith
If your truck is turned up enough to make the stock FSS fail, don't even bother replacing it until you get injectors. Mine destroyed it within a day

Second purchase
Oct 15, 2017  |  By Jacob
The FSS is a wear item, and I hear people complain often about this particular one. My fuel pump is a schied model fully built, so it tends to go though them. Although I may upgrade in the future, at this price, I don't see how anyone can complain.

Fuel shut off switch
Nov 7, 2017  |  By Scott
Works very well and you can not beat the price and the service has been great will continue to buy from Geno's

May 25, 2018  |  By JN
Item as described; however, shipping is slower than most places.

Install and Tech Information