ToolsnTrack
Posted a lot
Homebrew Raconteur
Posts: 4,117
Club RR Member Number: 134
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Ok, I am SOOOO feckin close to my car starting right now. I had a very good indication of spark, but no fuel. I cant suss out my fuel pump...  First off, it doesnt seem to match any of the replacement pumps I can see out there. Is it stock? Secondly, it wont pump fuel. Have I got the lines on back to front? At present my fuel in is going to the 90 degree port on the rear side of the pump, and the fuel out to the carb is at the front of the pump. Is this right? Lastly, is it worth considering going to electric? I have a holley pressure regulator before teh carb which may hold up if I fire an electric pump on and do away with this tight fitting nonsense. Would this be worthwhile? |
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ChasR
RR Helper
motivation
Posts: 10,194
Club RR Member Number: 170
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When you checked for no fuel, did you check it at the pump itself or after the regulator?
Going electric can make life easier, but I would be tempted to switch the hoses around (I guess there are no arrows on the pump to show how the fuel flows?).
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ToolsnTrack
Posted a lot
Homebrew Raconteur
Posts: 4,117
Club RR Member Number: 134
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Nah, no arrows. Never been happy with the 90 degree attachments proximity to the engine mount.
My check was symphonic fuel up to the pump, then attach. Then remove output hose from regulator, direct to cup and crank. No fuel, nor pressure when covered with finger.
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Dez
Club Retro Rides Member
And I won't sit down. And I won't shut up. And most of all I will not grow up.
Posts: 11,712
Club RR Member Number: 34
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I'm not 100% sure if its SBCs I'm thinking of, it might be something else, but i think there may be two types/lengths/shapes of fuel pump pump arm. possible incompatability issue?
ive never had an issue with SBC pumps, always seem pretty reliable, indeed ive replaced a couple of duff electric ones with the stock pumps in the past. only other thing it can really be is the diaphragm.
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ToolsnTrack
Posted a lot
Homebrew Raconteur
Posts: 4,117
Club RR Member Number: 134
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It's not been replaced or changed Dez, it's still the original setup. Will try switching hoses again to see if that's the problem, then the pump is coming off...
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ToolsnTrack
Posted a lot
Homebrew Raconteur
Posts: 4,117
Club RR Member Number: 134
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Apr 10, 2012 18:14:53 GMT
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So today i had another crack at it. Switched hoses: No difference. Spat the dummy and ripped the pump off completely and bench tested it. With a spanner over the arm for leverage it does pump petrol! So now i have established the right ends, i reattached the hoses, and pumped it up by hand. Fuel to the filter!!!
So the pump is fine, i re-bolt it up and crank over.... nothing. Sobofabitch!!
Pulled it off AGAIN and cracked it with the pump off, whilst holding the pump pushrod in with a screwdriver... seems like its not moving. So does this diagnosis make sense?
Pushrod for the cam to pump arm has siezed in place, but in the fully depressed position? Surely the engine would lock if it was siezed in the neutral off cam position?
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Dez
Club Retro Rides Member
And I won't sit down. And I won't shut up. And most of all I will not grow up.
Posts: 11,712
Club RR Member Number: 34
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Apr 10, 2012 18:52:47 GMT
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if youve had the pump off its more likey its dropped out of position. you kind of have to hold em up whilst you guide the pump in for em to locate properly on the pump. they can be fiddly to get back in right. there some trick about replacing one of the bolts in the block with a longer one to hold it up in position, but ive always managed to do it without.
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ToolsnTrack
Posted a lot
Homebrew Raconteur
Posts: 4,117
Club RR Member Number: 134
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Apr 10, 2012 19:19:37 GMT
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That still doesnt explain why the pushrod wasnt moving when i cranked the engine though dez... it was solid....
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burns
Part of things
Posts: 373
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Apr 11, 2012 12:48:43 GMT
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Is there such thing as cam with no lobe for the fuel pump? You replaced the cam recently didn't you?
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ToolsnTrack
Posted a lot
Homebrew Raconteur
Posts: 4,117
Club RR Member Number: 134
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Apr 11, 2012 17:53:13 GMT
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Well remembered burns. I did that, but there is a lobe there. I have infact found the problem...
Pics uploading....
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ToolsnTrack
Posted a lot
Homebrew Raconteur
Posts: 4,117
Club RR Member Number: 134
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Apr 11, 2012 19:27:19 GMT
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So heres what i found. Pulled the pump off to check the pushrod. Solid as before. Got a torch in there and observed this!  curse word pic but this is the view up into the pushrod chamber. See that to the right? That is this:  Feckin earth strap bolt! It went right through the block, out the other side, and nipped the pushrod! Must eb a design feature to alloow the rod to be locked before fitting the pump. Clever, if a touch frustrating. Heres the fix:  bolt out....  ...washer applied. Fuel pumping a treat now. Thanks to all for the replies, much appreciated! |
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bortaf
Posted a lot
Posts: 4,549
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Apr 11, 2012 20:02:13 GMT
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Good fooking lord !
i would laugh but thats exactly the sort of thing that happens to me all the time, glad you found it at least ;D
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R.I.P photobucket
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Dez
Club Retro Rides Member
And I won't sit down. And I won't shut up. And most of all I will not grow up.
Posts: 11,712
Club RR Member Number: 34
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Apr 11, 2012 20:17:44 GMT
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theres some trick about replacing one of the bolts in the block with a longer one to hold it up in position......... that bolt, does exactly as i described above  glad you found it though, its always the simplest problems cause the most headscratching! |
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ToolsnTrack
Posted a lot
Homebrew Raconteur
Posts: 4,117
Club RR Member Number: 134
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Apr 11, 2012 21:38:52 GMT
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Now we both know Dez... That's the trick!
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