2007 d7 hard starting

cowboy181d · Jan 17, 2017

hello all.
My 07 d7 is getting hard to start. 7-8 pulls then pop and runs ok with a bit of throttle input (1/8th throttle for about 10 seconds.) then she will run all day as long as you do not shut it down. restart is the same issue. 50psi fuel pressure at idle. no lights or dash when pulling it over but as soon as she comes too life I got full bars on my power gauge. only thing I got extra is the charging system for e-start (no starter just the battery and charging system, I am running the battery to keep my turbo oil pump and afr gauge off of the stator loads...).
Acts like the Capacitor is not holding a charge or maybe chassis relay?

any help would be great
thanks
Damen

XCaSSAULT · Jan 17, 2017

I think there's a check valve in the fuel system that holds the pressure so u don't have to build it back up every time. That's what is sounds like, that your having to build the fuel pressure back up every time. Not sure if there's a way to test it or not but worth looking into.

cowboy181d · Jan 17, 2017

I will look into that. I have a fuel pressure gauge mounted under my hood.

cowboy181d · Jan 18, 2017

ok today was 4 pulls to start every single pull 40psi fuel pressure (Including the very first pull of the day) but did not hold it. built pressure and dropped to zero each time.... until the fourth pull built 40psi and pop away she went. looks like I am loosing prime...

cowboy181d · Jan 21, 2017

Issue solved.... Pulled my fuel pump and discovered the last owner took the in tank regulator out. He installed a holley boost referenced EFI regulator externally (these are not designed to hold psi after shut down.) So I ordered a new assembly for it. And shimmed the external regulator up to 65psi. pump is good if I clamp the return line and shut down the sled it will hold 70psi for well over an hour until I pulled the clamp off. So in the spirit of I just want to ride I put a push button in that primes the pump so I can go riding....:face-icon-small-sho

XCaSSAULT · Jan 22, 2017

Wow, I wonder why a person would put a set-up like that on in the first place? Especially if it takes 10 pulls to prime the pump every time.

cowboy181d · Jan 23, 2017

yup my thoughts exactly...... but price was right when i bought the sled, 2k with the brand new turbo setup and a snapped crankshaft. right now with buying the sled and putting a new engine in it and misc repairs. I am under blue book for it stock. Oh well new pump is on its way.lol

cowboy181d · Jan 28, 2017

new fuel pump assembly got it fixed! 60psi at idle. still had 40psi on the system when I started it this afternoon. one pull and she fired!

tryanattak · Feb 20, 2017

I just bought an 09' 600 RMK shift and I have almost the same issue as you had. The difference is mine takes about 8 pulls to get it started when cold but after it is warm it starts first pull every time. It also has no running issues it runs very well actually. Any ideas what could be going on with mine?

mountainhorse · Feb 20, 2017

Fuel pressure should be at 58 psi +/- 2 psi.

Make sure you change your filter too if you haven't done it already.

Sounds like your sled was turbo'd at some point.

.

cowboy181d · Feb 21, 2017

oh yeah I did the fuel filter upgrade to a napa fuel filter using quick connects. more fuel volume in filter and 9 bucks versus 100.00 for the poo one.... And yup my ol girls boosted 11psi of fun! lol

Drewd · Feb 23, 2017

Can you share more info about the aftermarket fuel filter setup? Thanks!

cowboy181d · Feb 23, 2017

Sure thing man!
here is a link to the thread that had the info.
https://www.snowest.com/forum/showthread.php?t=209557

Search

2007 d7 hard starting

cowboy181d

Well-known member

XCaSSAULT

Well-known member

cowboy181d

Well-known member

cowboy181d

Well-known member

cowboy181d

Well-known member

XCaSSAULT

Well-known member

cowboy181d

Well-known member

cowboy181d

Well-known member

tryanattak

Free Member

mountainhorse

Well-known member

cowboy181d

Well-known member

Drewd

Well-known member

cowboy181d

Well-known member

Similar threads