Fass pump has no presuure - Ford Powerstroke Diesel Forum
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post #1 of 9 Old 01-24-2011, 08:18 PM Thread Starter
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Fass pump has no presuure

I recently had a thread about installing a fass pump for wvo and now that I have been able to install it correctly it won't pump at all. It turns on and sounds like it is pumping, but it barely pushes the oil and makes no pressure at all. I know that these pumps are picky about air in the lines and being primed and such, but I have done the 5 gallon bucket test with pump alone and it will still barely pump the diesel. I have taken it apart and put it back together once since it stopped pumping, and the first time I used it I saw it pump 70 psi constantly for a few minutes and then it stopped. That was using power from the stock pump so I figured it just wasn't getting enough power, I rewired it with 2 relays and 30 amps from the battery and now it has no pressure at all. Any ideas to what this could be? It's a brand new pump.
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post #2 of 9 Old 01-24-2011, 08:27 PM
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Call Fass.


I hope you didnt take it apart. like the four bolts holding the pump head on....
Thats a big no-no with the Fass boys.

99 F350 7.3
320K w/ 150k+ on Biofuels

Casserly Stage 2's-TE Modded 17 HPOP
DP Tuner F6 & PMT1-Van Turbo Non EBPV & 6637
Twin Fass Pumps B100 & D2 Regulated Return- Fuel Lab
Isspro Pyro, Trans, Boost-Air and Fuel Temp
WVO processed by Simple Centrifuge
B100 by Biopro 190
B100 powered Excursion, F250 CCSB, and Two TDI Jettas
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post #3 of 9 Old 01-25-2011, 01:43 AM
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Don't tell them you took it apart.

2001 f-350 ext.cab. 7.3 auto non dually. 262k miles. New HD tranny at 67,000 miles. Boost, EGT, Tranny temp gauges. 04/10 DIY check valve VO conversion. 20 plate FPHE,Fass HPFP set at 70 PSI,TIH, 10 micron spin on filter with coolant wrap, 150 micron prefilter, hrydraforce purge valve, 40 gallon greasecar tank with hotfox, SS braided hose to heads, Oil temp, pressure & fuel level gauges. 110K miles on grease. Monitoring with Torque.
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post #4 of 9 Old 01-25-2011, 05:27 AM
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Quote:
Originally Posted by simone0414 View Post
Don't tell them you took it apart.

LOL. They will know with the security wire from the four head bolts missing!
I hope he didnt take the head bolts out......

99 F350 7.3
320K w/ 150k+ on Biofuels

Casserly Stage 2's-TE Modded 17 HPOP
DP Tuner F6 & PMT1-Van Turbo Non EBPV & 6637
Twin Fass Pumps B100 & D2 Regulated Return- Fuel Lab
Isspro Pyro, Trans, Boost-Air and Fuel Temp
WVO processed by Simple Centrifuge
B100 by Biopro 190
B100 powered Excursion, F250 CCSB, and Two TDI Jettas
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post #5 of 9 Old 01-25-2011, 05:31 AM Thread Starter
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I wish you hadn't told me there was a security wire... It didn't work so like all other things that don't work I took it apart to see what was wrong
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post #6 of 9 Old 01-25-2011, 05:40 AM
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Quote:
Originally Posted by mpiller View Post
I wish you hadn't told me there was a security wire... It didn't work so like all other things that don't work I took it apart to see what was wrong
Wait a minute, the last one I instaled had a round pump head. It did not have the four head bolts and the square pump head; which has the tinned security wire. If it has the square pump head with the tinned wire, its not gonna be pretty.

If it is the newer style round head, you might be OK.

99 F350 7.3
320K w/ 150k+ on Biofuels

Casserly Stage 2's-TE Modded 17 HPOP
DP Tuner F6 & PMT1-Van Turbo Non EBPV & 6637
Twin Fass Pumps B100 & D2 Regulated Return- Fuel Lab
Isspro Pyro, Trans, Boost-Air and Fuel Temp
WVO processed by Simple Centrifuge
B100 by Biopro 190
B100 powered Excursion, F250 CCSB, and Two TDI Jettas
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post #7 of 9 Old 01-25-2011, 06:43 AM
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Are we talking about a used pump here? I had the same problem with brand new pump but just had to disconnect the output hose to get the air out of the system. No security wire on mine.

Early 99 crew cab long bed SRW
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post #8 of 9 Old 01-25-2011, 03:34 PM Thread Starter
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Its the round head, I called them today and it's fine I just have to send it in for the warranty work. Was really hoping this was something I could fix instead of waiting to ship it and get it back but they seem to have good customer service so hopefully it will be quick. I also have to send in the warranty info first so I have to wait longer. Erbilabuc, where did you buy yours from? Mines a new pump, and I've tried disconnecting the output line and still nothing. Ive also tried the 5 gallon bucket test with regular diesel and it will barely pump the diesel out of it.
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post #9 of 9 Old 01-25-2011, 04:13 PM
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I bought mine directly from FASS.

Early 99 crew cab long bed SRW
Vegistroke V3.
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