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fuel pressure

  1. #1
    Senior Member skippers WFOT's Avatar
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    Default fuel pressure

    last run i made ran good for the first few passes. then started to cut out. looked back at the fuel pressure.....zero. pumped the gas and kept it running. limped back to the shore at about 2-3k and it stayed running but the guage never got above 1psi. back on the trailer i cycled the key to listen to the pump and it sounded strong and i saw my 4-5lbs. got the boat on level ground checked the saddle tanks. 1 side has 1/2 tank other has about a gal. there is no selecter valve, just a T on the transom. where should i start to figure out why its not pulling equally from both tanks. im assuming my loss of pressure was from loss of fuel @WOT
    1977 Charger 17Foot. jacuzzi golden eagle
    402 BBC tunnel ram with dual 660 fuel leaks on the top.

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  3. #2
    Living in a cage of fear thatguy's Avatar
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    Quote Originally Posted by skippers WFOT View Post
    last run i made ran good for the first few passes. then started to cut out. looked back at the fuel pressure.....zero. pumped the gas and kept it running. limped back to the shore at about 2-3k and it stayed running but the guage never got above 1psi. back on the trailer i cycled the key to listen to the pump and it sounded strong and i saw my 4-5lbs. got the boat on level ground checked the saddle tanks. 1 side has 1/2 tank other has about a gal. there is no selecter valve, just a T on the transom. where should i start to figure out why its not pulling equally from both tanks. im assuming my loss of pressure was from loss of fuel @WOT
    Rarely do they pull even.
    I have a petcock on my "fast" tank that I pinch down to even them out. No selector.
    I have been known to shut it in also and get fuel at the docks in only the unregulated tank to get back across the lake to the launch I use.

    If you can't shut in the empty tank, they both might as well both be empty because it ain't going to work!
    Tommy
    Quote Originally Posted by Rexone View Post
    Tommy please remove all Jimsplace quotes from your sig and don't put more back. He doesn't like it and it is against the rules. Thank you.
    "So as through a glass, and darkly
    The age long strife I see
    Where I fought in many guises,
    Many names, but always me."

    Gen. George S Patton

  4. #3
    What the Hell is That? 72Hondo's Avatar
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    Quote Originally Posted by skippers WFOT View Post
    last run i made ran good for the first few passes. then started to cut out. looked back at the fuel pressure.....zero. pumped the gas and kept it running. limped back to the shore at about 2-3k and it stayed running but the guage never got above 1psi. back on the trailer i cycled the key to listen to the pump and it sounded strong and i saw my 4-5lbs. got the boat on level ground checked the saddle tanks. 1 side has 1/2 tank other has about a gal. there is no selecter valve, just a T on the transom. where should i start to figure out why its not pulling equally from both tanks. im assuming my loss of pressure was from loss of fuel @WOT


    I assume this is an Electric pump? Keep in mind those pumps were made to push not suck. Check for clogs in the lines, fuel Filter, pickups etc.
    Quote Originally Posted by Kyle View Post
    Log off and go float, hang in the party coves, Show and shine on the trailer, fill up the boat, wax it, v-drive, jet, outdrive, and if you got a canoe and your reading this, you sir, need to phucking upgrade.

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    Quote Originally Posted by skippers WFOT View Post
    there is no selecter valve, just a T on the transom. where should i start to figure out why its not pulling equally from both tanks.
    i'm gonna presume your pulling fuel from the top of your tanks cause of the T being mounted to your transom?...thats what i think is your problem...i run both of my tanks with equal length hoses to a T & then to the mech fuel pump, but, my T lies on the floor under my oil pan & my tanks feed off the bottom! ...they both feed equally & i have "never" had a problem...no selector switch

    FastRat

  7. #5
    Senior Member skippers WFOT's Avatar
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    yes it comes off the tops of the tanks.
    hoses are equal to the "T"
    "T" is mounted right above jet pump below the level of the top of tank
    from there the line drops to the filter and Epump that is mounted on the stringer.
    after that the pump pushes the fuel up to the regulater that is mounted on the carb base
    1977 Charger 17Foot. jacuzzi golden eagle
    402 BBC tunnel ram with dual 660 fuel leaks on the top.

  8. #6
    Senior Member skippers WFOT's Avatar
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    no one with any more ideas
    1977 Charger 17Foot. jacuzzi golden eagle
    402 BBC tunnel ram with dual 660 fuel leaks on the top.

  9. #7
    Living in a cage of fear thatguy's Avatar
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    Quote Originally Posted by skippers WFOT View Post
    no one with any more ideas
    Make sure there are no restrictions, OR air leaks in either line before the T.
    Put a petcock on the faster tank line before the T and shut it about half way to start with. (Since the other tank was still about half full)
    Fill both tanks.
    Run the boat on the water a while, dip the tanks with a ruler for fuel level, adjust petcock open or closed more, problem over!
    (Might take a couple adjustments)

    It surprises me when people over engineer the dual tank deal, it is a very simple system unless you have a big boat with electric everything.
    Tommy
    Quote Originally Posted by Rexone View Post
    Tommy please remove all Jimsplace quotes from your sig and don't put more back. He doesn't like it and it is against the rules. Thank you.
    "So as through a glass, and darkly
    The age long strife I see
    Where I fought in many guises,
    Many names, but always me."

    Gen. George S Patton

  10. #8
    Senior Member skippers WFOT's Avatar
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    ill check the lines and fittings at the tank and then put in the valve. thanks to all
    1977 Charger 17Foot. jacuzzi golden eagle
    402 BBC tunnel ram with dual 660 fuel leaks on the top.

  11. #9
    Living in a cage of fear thatguy's Avatar
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    Quote Originally Posted by skippers WFOT View Post
    ill check the lines and fittings at the tank and then put in the valve. thanks to all
    I have mine screwed in right at the tank bung. Kind of hard to reach under and adjust, but I only had to do it a couple times.

    You could put it at the T if you wanted.

    ($8.00 or so at Ace hardware for a brass petcock)

    I would try to also lower the T itself. Mine is about 6-8 inches up on the transom, to the starboard side of the jet, just high enough so that it is above the canister filter that is after the T.
    I am not at home, but I'll see if I have a pic somewhere on this computer.
    Last edited by thatguy; 08-31-2010 at 10:49 PM.
    Tommy
    Quote Originally Posted by Rexone View Post
    Tommy please remove all Jimsplace quotes from your sig and don't put more back. He doesn't like it and it is against the rules. Thank you.
    "So as through a glass, and darkly
    The age long strife I see
    Where I fought in many guises,
    Many names, but always me."

    Gen. George S Patton

  12. #10
    senior member turbo wog's Avatar
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    i noticed that my holley electric fuel pump did not like to run consistant after it sat over the winter , i now will put something like wd40 in the pump so it doesn't corrode. it could be quitting on you?

  13. #11
    21 Daytona Outlaw's Avatar
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    Quote Originally Posted by skippers WFOT View Post
    ill check the lines and fittings at the tank and then put in the valve. thanks to all

    while your at it just put a valve on each side of that tee and you can isolate each tank, WA LA end of problem
    #55

  14. #12
    Senior Member skippers WFOT's Avatar
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    Quote Originally Posted by turbo wog View Post
    i noticed that my holley electric fuel pump did not like to run consistant after it sat over the winter , i now will put something like wd40 in the pump so it doesn't corrode. it could be quitting on you?
    pump only has about an hour of run time on it. so i hope its not quitting, i bought it new in spring. and as for going any lower with the "T"....it is almost sitting on the pump housing now so any lower and it would be even with the stringers
    1977 Charger 17Foot. jacuzzi golden eagle
    402 BBC tunnel ram with dual 660 fuel leaks on the top.

  15. #13
    Glendale Arizona Squirtcha?'s Avatar
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    Quote Originally Posted by skippers WFOT View Post
    no one with any more ideas
    I had the same problem earlier this summer. Found that one of my tanks wasn't venting properly. Fuel won't draw very well (if at all) from an unvented tank. It just creates a vacuum in the tank.

    Mine was the little o-ring on a flat type cap. Took it apart and put a new o-ring on it and the problem was solved.

    Mine was pretty easy to figure out because the little flipper deal wouldn't lock/latch down like it did before the problem. It was just flopping around due to the bad o-ring.

    Even if you have a different style cap the same could hold true. Check any rubber seals (the old flip type caps) and venting holes for blockage etc.




    The bad o-ring on mine isn't the one you can see here (although I'd check that too). I took off the 7/16" nut, spring, and cable. The rubber is under all that stuff. You can also see the vent hole in this picture angling in from the right side. Gotta love the cheap and easy fixes.

    Last edited by Squirtcha?; 09-01-2010 at 11:46 AM.

  16. #14
    Senior Member skippers WFOT's Avatar
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    ive got the flip top caps and they are new.
    1977 Charger 17Foot. jacuzzi golden eagle
    402 BBC tunnel ram with dual 660 fuel leaks on the top.

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