[TR] Fuel starvation in my TR4 - Report back

dmericas at austin.rr.com dmericas at austin.rr.com
Mon Sep 20 07:08:57 MDT 2010


Thanks for the suggestions Ben.

Regarding #1, the fuel pump is pretty low on the TR4 block, and I believe the level of the inlet is almost always below the fuel level in the tank.  I've had problems with a nearly full tank.  I would expect to see some fuel leakage if there was a cracked rubber hose, but I'll try putting in all new hoses when I drain the system.

Regarding #2, I swapped out the pump with a good spare that I had on the shelf, with no effect whatsoever.

Regarding recovery time, a few moments is probably more accurate.  It recovers immediately if I back off the throttle. It takes longer if I the push on, for example to continue up the hill.

Dean

---- Ben Zwissler <bjzwissler at gmail.com> wrote: 
> OK, two more suggestions.  Both based on the fact you get this problem 
> only going uphill.
> 
> Suggestion 1.  Going back to 1979, there's a parking lot outside our 
> dorm that has a slight grade (nose up).  Roommate's car won't start when 
> parked in that position.  Starts and runs fine anywhere else.  Plymouth 
> coupe with tank mounted under trunk.  With nose up fuel level is below 
> fuel pump inlet.  There's a crack in the rubber hose at the fuel pump 
> inlet.  When fuel level is below pump inlet, pump draws air rather than 
> fuel.   Replace hose and problem solved.
> 
> Suggestion 2.  Similar issue, but problem is in fuel pump.  Leaking 
> one-way valve on inlet behaves like cracked fuel line. Same issue if 
> there's crack in the diaphragm.  Solution, replace or rebuild fuel pump 
> or try an in-line electric pump.  Crack in diaphragm can also cause some 
> fuel to go to crankcase so adding an electric pump when you have a 
> cracked diaphragm will push more fuel into the crankcase.  Watch for 
> rising oil levels...
> 
> Does it really take a minute or two to recover?  That seem likes a long 
> time for a fuel supply problem, starts to sound like something else again.
> 
> Ben......
> 
> Ben Zwissler
> bjzwissler at gmail.com
> Columbus, IN
> 1966 Triumph TR4A
> 1973 MG Midget
> 1980 Triumph TR8
> 2007 Mazda RX8
> 2002 Yamaha FZ1
> 2003 Honda ST1300


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