FASS pump losing prime

[dbarker4322]

I installed a Fass pump on an 02, now it is very hard to start. It runs good once it is started. I'm sure it is losing prime. If I loosed the filter lid and let it prime, it will start right up. Does the pump have a check valve? Or is there a hole in a fuel line?(no visible leaks)

[Buck08]

Sounds like there is a leak somewhere letting air back in when shut off.

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07 silver Mega cab 5.9 6 sp smartyjr 60 horse predater tow box(4 sale), Muffler delete, Gutted tube, silencer ring-MIA. SS steps, Cummins stickers and no room left in the box

[dbarker4322]

I just tried it and got it started, shut it off for 10 seconds. It would not start again...
I got it started and ran it for a little bit.. shut it off and it wouldn't start back immediatly, any suggestions.

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Last edited by dbarker4322 : 05-07-2008 at 06:42 PM. Reason: retried starting..

[Diesel-Dan]

Originally Posted by dbarker4322

I just tried it and got it started, shut it off for 10 seconds. It would not start again...
I got it started and ran it for a little bit.. shut it off and it wouldn't start back immediatly, any suggestions.

Do you have a HPFP or FASS? You said filter lid...so i assume HPFP......

We talking our pump or the truck? What is your fuel pressure doing and how long does it take to build?

Try unplugging the FASS and try to start the truck. If it starts, stop it quickly.

Fill in your signature as well......that will help me with some things....

Also see attached schematic...we might need to look at doing this.....

Attached Images

wh-1002_hard_start_fix.pdf (66.5 KB, 2 views)

__________________
Dan MacDonald
Diesel Performance Products
Head of Wnty/Trouble Shooting

Please don't PM me. I have a Vendor section just for CF users to post questions. I would like to keep everything public as it might help others with similar issues. Thanks for your understanding.

GO STARS!

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Last edited by Diesel-Dan : 05-08-2008 at 07:43 AM.

[dbarker4322]

Dan, thanks for the reply.
I have the HPFP. I no longer believe that my pump is the problem, the pressure is good and it is turning on like it should. I can get it running on ether(I know its bad) and even that takes some doing. I believe that the problem is electronic. It sounds like the fuel shutoff isn't letting it start. I'm probably in the wrong section to post, but I do appreciate your help.

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02 Dodge 3500 Fass HPFP propane

[Diesel-Dan]

Originally Posted by dbarker4322

Dan, thanks for the reply.
I have the HPFP. I no longer believe that my pump is the problem, the pressure is good and it is turning on like it should. I can get it running on ether(I know its bad) and even that takes some doing. I believe that the problem is electronic. It sounds like the fuel shutoff isn't letting it start. I'm probably in the wrong section to post, but I do appreciate your help.

DUDE.....go easy on the happy gas....

At this point....check for codes....Injection pumps can die like you are seeing....hate to say that...but i have seen one or 2 go that way. Bad thing is when they die like this, they normaly dont pop a code. SO....might be trickey to pull the trigger on.....

ALSO...check you Batt's. Make sure they are 12V and have high amps load tested! (One at a time)

__________________
Dan MacDonald
Diesel Performance Products
Head of Wnty/Trouble Shooting

Please don't PM me. I have a Vendor section just for CF users to post questions. I would like to keep everything public as it might help others with similar issues. Thanks for your understanding.

GO STARS!