Electric Fuel Pump - force system prime?
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Junior User
Joined: Aug 2007
Posts: 74
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Electric Fuel Pump - force system prime?
While the key is on and electric fuel pump going, it runs continuously, albeit slowly. Walbro 7 psi 50 gph 'click'ing every 2-3 seconds. I noticed in another thread someone mentioned leaving an electric pump running for a while to force bleed the injector lines. Anyone else verify this "slow bleed" method? how long does it take?
Thanks,
Thanks,
Senior User
Joined: Mar 2008
Posts: 368
Likes: 0
From: Jupiter
it bleeds the return lines when i get alot of air in the system i just let the pump run while the GPs are on and then start it and then it will run a minute and stall only sometimes then just a few more seconds maybe 10 on the pump and it starts and runs fine.
Fleet Owner
Joined: Jul 2006
Posts: 20,359
Likes: 819
From: Mi'kma'ki
im learning!
oh yeah,the holy red pump seems to be the preference around here.
i see many doing this due do to making a better system with less starting probs.
but dont forget this is a MPG/HP mod too!!
a manual fuel pump runs off the crank(way old school!!).the holly red's i notice only draw a couple amps!
the hp gain i would bet(for those very used to their trucks) is enough to actually feel.
when you can feel the diff in one mod alone,you know your on your way to freeing up some ponies.
(read some racing equp places where some add's claim "free up "##"HP with a electric fuel pump"-some have proven dyno tests to back up such claims as well)
Freshman User
Joined: Sep 2002
Posts: 47
Likes: 0
From: New Zealand
I ran my truck out of diesel completely on the weekend and an electric fuel pump makes it dead easy to get started again. I just bleed from the valve on the fuel filter and that was enough to get started right up. Coughed abit at first but a pretty quick startup.
When i bypassed my Mechanical fuel pump i noticed a huge difference in power , but that was due to the motor actually getting enough fuel for once lol.
When i bypassed my Mechanical fuel pump i noticed a huge difference in power , but that was due to the motor actually getting enough fuel for once lol.
Elder User
Joined: Mar 2008
Posts: 912
Likes: 0
From: Marianna, Florida USA
I use an EP80S ( 6-7 PSI) in series with the mechanical pump. I only use it to prime the system to relieve the load on the starter. I cut a section out of the metal line going to the filter and insert the electric pump. That way if I have a bad diaphragm in the mechanical pump, I won't fill the crank case with fuel. I only get air into the system which lets me know there's a problem. Actually, the rubber line from the frame to the mechanical pump is long enough that I can slip the connector hose off of the electric pump and bypass the mechanical pump.
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