Magnafuel pump question!
Magnafuel pump question! I have the magnafuel 4301 pump and recently ive been noticing that after i run my car for an hour or so...My fuel pressure gauge starts flickering and so does the pump..My pressure be at 58psi and then it starts dropping to 55psi and it just be back and forth! It had never done that till recently...
A common problem with large pumps is fuel heating due to the constant high flow through the system. Keep in mind all the power going into the pump is converted to heat which heats the fuel. This is the reasoning behind pump controllers as they slow down the flow & lessen the power draw, keeping the fuel cooler. You can also run a fuel cooler in the return line to help somewhat.
A common problem with large pumps is fuel heating due to the constant high flow through the system. Keep in mind all the power going into the pump is converted to heat which heats the fuel. This is the reasoning behind pump controllers as they slow down the flow & lessen the power draw, keeping the fuel cooler. You can also run a fuel cooler in the return line to help somewhat.
Trending Topics
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
Gas Monkey Built a 6-Wheel Ferrari Testarossa With a Corvette LT4 Engine
Verdad Gallardo
7 Most Reliable High-Performance Engines GM Has Ever Built
Verdad Gallardo
Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin
Verdad Gallardo
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo I use to have an aeromotive pump that use to do the same thing.I switch to this one cause it was suppose to be the ultimate street pump and its doing the same as the aeromotive pump.
TECH Apprentice
Joined: Sep 2005
Posts: 334
Likes: 1
Here's how we like to set-up our Magnafuel Pro-Tuner systems:
Insulate fuel tank/cell and lines from any heat sources
2 x -8 vents
-12 inlet with 7006 prefilter
Magnafuel ProTuner pump (usually 750's because the cost is so close for all of them)
-10 feed with 7008 filter
9950 regulator
-10 return with 11"X8.5"X1.5" plate style cooler
return fuel to corner of tank/cell furthest from the sump/pick-up
Alot of people don't spend the money and effort to set them up this way.
But, it keeps us from having issues like the OP's.
Insulate fuel tank/cell and lines from any heat sources
2 x -8 vents
-12 inlet with 7006 prefilter
Magnafuel ProTuner pump (usually 750's because the cost is so close for all of them)
-10 feed with 7008 filter
9950 regulator
-10 return with 11"X8.5"X1.5" plate style cooler
return fuel to corner of tank/cell furthest from the sump/pick-up
Alot of people don't spend the money and effort to set them up this way.
But, it keeps us from having issues like the OP's.
Here's how we like to set-up our Magnafuel Pro-Tuner systems:
Insulate fuel tank/cell and lines from any heat sources
2 x -8 vents
-12 inlet with 7006 prefilter
Magnafuel ProTuner pump (usually 750's because the cost is so close for all of them)
-10 feed with 7008 filter
9950 regulator
-10 return with 11"X8.5"X1.5" plate style cooler
return fuel to corner of tank/cell furthest from the sump/pick-up
Alot of people don't spend the money and effort to set them up this way.
But, it keeps us from having issues like the OP's.
Insulate fuel tank/cell and lines from any heat sources
2 x -8 vents
-12 inlet with 7006 prefilter
Magnafuel ProTuner pump (usually 750's because the cost is so close for all of them)
-10 feed with 7008 filter
9950 regulator
-10 return with 11"X8.5"X1.5" plate style cooler
return fuel to corner of tank/cell furthest from the sump/pick-up
Alot of people don't spend the money and effort to set them up this way.
But, it keeps us from having issues like the OP's.
TECH Apprentice
Joined: Sep 2005
Posts: 334
Likes: 1
-8 on the return will be okay. I usually regulate the systems down to ~35psi at zero boost/vacuum, so I'm bypassing alot more fuel at idle than people running stock pressures. But, even for that, -8 would probably be adequate. Reason for the low base pressure is because the pump volume falls off pretty hard at elevated pressures. We find that 35# base, with 1:1 boost reference, works perfectly with 1600cc injectors; the 750 pump and 1600 injectors both max out right around 1500 flywheel horsepower on our typical e85 applications.
I've never measured the temp on the return side, but we've never had a heat issue with that set-up. Alot of people consider it overkill, but I'd rather have overkill than problems.
I've never measured the temp on the return side, but we've never had a heat issue with that set-up. Alot of people consider it overkill, but I'd rather have overkill than problems.
-8 on the return will be okay. I usually regulate the systems down to ~35psi at zero boost/vacuum, so I'm bypassing alot more fuel at idle than people running stock pressures. But, even for that, -8 would probably be adequate. Reason for the low base pressure is because the pump volume falls off pretty hard at elevated pressures. We find that 35# base, with 1:1 boost reference, works perfectly with 1600cc injectors; the 750 pump and 1600 injectors both max out right around 1500 flywheel horsepower on our typical e85 applications.
I've never measured the temp on the return side, but we've never had a heat issue with that set-up. Alot of people consider it overkill, but I'd rather have overkill than problems.
I've never measured the temp on the return side, but we've never had a heat issue with that set-up. Alot of people consider it overkill, but I'd rather have overkill than problems.
