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-   -   FASS Surging Fuel Pressure (http://www.dieselram.com/showthread.php?t=199975)

DougC 05-05-2011 07:48 PM

FASS Surging Fuel Pressure
Hello all,

I installed a new FASS 95 last weekend. Everything has been fine until today on the way home from work. My fuel pressure started to surge or fluctuate between 11 and 13 psi. But I always seem to have plenty of pressure. It had been running a steady 13-14psi. When pulling into the garage I noticed that the pump was making a surging noise that coincides with the suge in pressure. On the drive home the pressure would surge like this for a minute or two then hold steady like normal for a while, then surge again.

Has anybody experienced this? Do I have a pump/motor issue? AIr? Being as I have had the pump less than a week I have little experience. Any help is greatly appreciated.


MAXTORQ 05-05-2011 09:27 PM

Is this a full FASS or pump only?

DougC 05-05-2011 10:01 PM

Full FASS. The surge is real fast and in time with the sound from the motor. I have done a little research and am wondering if I have an issue with the spring. I could not find real good instructions on how to check.

Thanks for your help.

MAXTORQ 05-05-2011 10:08 PM

There is a return spring and check ball on the pump. The return line that comes off the pump and returns to the filler neck is what we are focused on.

Remove the connection at the pump, now on the pump is a fitting 7/8 I believe . Remove this fitting behind it will be the spring and check ball . Take the ball out and rotate it 180 and reinstall.

What you are hearing is returned air but the check ball may be sticking causing the pump to sure a little. It doesnt really hurt it just annoying.

DougC 05-05-2011 10:17 PM

Thanks for the info. I will give that a try tomorrow night after work. Will this be a permanent fix? I like the pump but it has been on less than a week.

While you are away, I know your shop is open on a limited basis. Would a clutch have to wait unitl you return?

You staying dry out there? My folks live in S. Illiniois and have been flooded out of their house. Crazy amounts of rain. (I linger here and read every day, but hardly post)

Again, thanks for the quick reply.

MAXTORQ 05-05-2011 10:25 PM

Yes you would have to wait if you wanted it done by me.

Yes its a fix.

Yes rain flooded HWY 67 north for two days.

DougC 05-05-2011 10:31 PM

I will be in touch about the clutch. Thanks again and take care.

DougC 05-12-2011 01:12 PM

Thanks again Max, it appears to have taken care of the issue. No surging this week.

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