Runninwild
Veteran Member
Hey guys. I swapped a bhw into my Tacoma recently. I haven't put many miles on the swap yet but I've developed what I think is a priming issue. I have hard starting when the engine has been sitting for a while.
I have a cheap low pressure inline primer pump originally in my engine bay. When I first completed the swap I didn't have any starting or running issues. I eventually started having problems losing prime over night. I ended up installing a check valve on each fuel line which seemed like it helped. I didn't drive the truck but fired it up every night when I got home from work and it always started first crank. On the Friday night I took the truck to home Depot, about 1km out of the parking lot it died at an intersection and was really hard to start. Eventually got it going and took off. A few more km down the road and the truck started sputtering like it was running out of fuel. I pulled into a gas station and the truck died. Filled 45l (half of my 90l tank) when diesel started to pour out of the fill neck. Got the truck going again and started heading home. For the first couple km the truck was sputtering like it was running out of fuel but eventually smoothed out and went back to normal. The next morning I relocated my primer pump and fuel delivery check valve to directly infront of my fuel tank. Put about 70km on the truck this weekend with multiple starts and stops. A couple of times it would crank over a bit before firing but nothing too crazy. This morning I went to take the truck to work and it wouldn't start. Was cranking on it for about a minute and I got it to cough once then cranked like another minute before giving up.
Does this most likely sound like my tandem pump? Fuel tank and all my lines are new and I can't find any cracks or external leaks in any of the hoses. If it is the tandem pump is there a way to fix it or does it need to be fully replaced? Engine has about 280,000km on it if that makes a difference. Haven't noticed any increase in oil level or my oil smelling like diesel in the limited mileage I've put on since the swap.
I have a cheap low pressure inline primer pump originally in my engine bay. When I first completed the swap I didn't have any starting or running issues. I eventually started having problems losing prime over night. I ended up installing a check valve on each fuel line which seemed like it helped. I didn't drive the truck but fired it up every night when I got home from work and it always started first crank. On the Friday night I took the truck to home Depot, about 1km out of the parking lot it died at an intersection and was really hard to start. Eventually got it going and took off. A few more km down the road and the truck started sputtering like it was running out of fuel. I pulled into a gas station and the truck died. Filled 45l (half of my 90l tank) when diesel started to pour out of the fill neck. Got the truck going again and started heading home. For the first couple km the truck was sputtering like it was running out of fuel but eventually smoothed out and went back to normal. The next morning I relocated my primer pump and fuel delivery check valve to directly infront of my fuel tank. Put about 70km on the truck this weekend with multiple starts and stops. A couple of times it would crank over a bit before firing but nothing too crazy. This morning I went to take the truck to work and it wouldn't start. Was cranking on it for about a minute and I got it to cough once then cranked like another minute before giving up.
Does this most likely sound like my tandem pump? Fuel tank and all my lines are new and I can't find any cracks or external leaks in any of the hoses. If it is the tandem pump is there a way to fix it or does it need to be fully replaced? Engine has about 280,000km on it if that makes a difference. Haven't noticed any increase in oil level or my oil smelling like diesel in the limited mileage I've put on since the swap.